SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C.  20549

                              ____________________

                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                         REGENERON PHARMACEUTICALS, INC.                   
             (Exact name of registrant as specified in its charter)

               New York                              13-3444607          
     (State of Incorporation or Organization)       (IRS Employer
                                                   Identification No.)

      777 Old Saw Mill River Road, Tarrytown, New York       10591-6707 
     (Address of principal executive offices)                (Zip Code)

     Securities to be registered pursuant to Section 12(b) of the Act:

                                                  Name of each exchange
               Title of each class                on which each class is
               to be so registered                to be registered          

                    None                              N/A

     Securities to be registered pursuant to Section 12(g) of the Act:

                         Preferred Stock Purchase Rights                   
                                (Title of Class)

          ITEM 1.   DESCRIPTION OF SECURITIES TO BE REGISTERED.

                    On September 20, 1996, the Board of Directors of
          Regeneron Pharmaceuticals, Inc. (the Company) adopted a
          Shareholder Rights Plan, providing that one Right shall be
          attached to each share of Common Stock, par value $0.001 per
          share (the Common Shares) and Class A Stock, par value
          $0.001 per share (the Class A Stock and, together with the
          Common Shares, the Common Stock) of the Company.  Each Right
          entitles the registered holder to purchase from the Company
          a unit (a Unit) consisting of one one-thousandth of a share
          of Series A Junior Participating Preferred Stock, par value
          $0.01 per share (the Preferred Stock), at a purchase price
          (the Purchase Price) of $120.00 per one one-thousandth of a
          share of Preferred Stock (a Unit), subject to adjustment. 
          The description and terms of the Rights are set forth in the
          Rights Agreement (the Rights Agreement), dated as of
          September 20, 1996, between the Company and ChaseMellon
          Shareholder Services L.L.C., a New Jersey limited liability
          company, as Rights Agent (the Rights Agent).

                    Initially, the Rights will be attached to all
          Common Stock certificates representing shares then
          outstanding, and no separate Rights Certificate will be
          distributed.  The Rights will separate from the Common
          Stock upon the earlier of (i) 10 days following a public
          announcement that a person or group of affiliated or
          associated persons (an Acquiring Person) has acquired, or
          has obtained the right to acquire, beneficial ownership of
          20% or more of the outstanding shares of Common Stock (the
          Stock Acquisition Date) or (ii) ten business days
          following the commencement of a tender offer or exchange
          offer that would result in a person or group beneficially
          owning 20% or more of such outstanding shares of Common
          Stock (the earlier of (i) and (ii), the Distribution
          Date).  The definition of Acquiring Person, subject to
          certain limitations set forth in the Rights Agreement,
          excludes Amgen Inc., which currently holds Common Stock,
          Class A Stock, and a Warrant to purchase Common Stock and
          Leonard S. Schleifer, who currently holds Class A Stock
          and certain permitted transferees of Dr. Schleifer,
          subject to certain limitations.  Until the Distribution
          Date, (i) the Rights will be evidenced by the Common Stock
          certificates and will be transferred with and only with
          such Common Stock certificates, (ii) new Common Stock
          certificates will contain a notation incorporating the
          Rights Agreement by reference, and (iii) the surrender for
          transfer of any certificates for Common Stock outstanding
          will also constitute the transfer of the Rights associated
          with the Common Stock represented by such certificate.

                    The Rights are not exercisable until the
          Distribution Date and will expire at the close of business
          on October 18, 2006 unless earlier redeemed by the Company
          as described below.  At no time will the Rights have any
          voting power.

                    As soon as practicable after the Distribution
          Date, Rights Certificates will be mailed to holders of
          record of the Common Stock as of the close of business on
          the Distribution Date and, thereafter, the separate Rights
          Certificates alone will represent the Rights.  Except as
          otherwise determined by the Board of Directors, only
          shares of Common Stock issued prior to the Distribution
          Date will be issued with Rights.

                    In the event that an Acquiring Person becomes
          the beneficial owner of 20% or more of the then
          outstanding shares of Common Stock (unless such
          acquisition is made pursuant to a tender or exchange offer
          for all outstanding shares of the Company, at a price
          determined by a majority of the independent directors of
          the Company who are not representatives, nominees,
          Affiliates, or Associates of an Acquiring Person to be
          fair and otherwise in the best interest of the Company and
          its shareholders after receiving advice from one or more
          investment banking firms (a Qualifying Offer)), each
          holder of a Right will thereafter have the right to
          receive, upon exercise, Common Shares (or, in certain
          circumstances, cash, property, or other securities of the
          Company), having a value equal to two times the Exercise
          Price of the Right.  The Exercise Price is the Purchase
          Price times the number of shares of Common Shares
          associated with each Right (initially, one). 
          Notwithstanding any of the foregoing, following the
          occurrence of any of the events set forth in this
          paragraph (the Flip-in Events), all Rights that are, or
          (under certain circumstances specified in the Rights
          Agreement) were, beneficially owned by any Acquiring
          Person will be null and void.  However, Rights are not
          exercisable following the occurrence of any of the Flip-in
          Events set forth above until such time as the Rights are
          no longer redeemable by the Company as set forth below.

                    In the event that following the Stock
          Acquisition Date, (i) the Company engages in a merger or
          business combination transaction in which the Company is
          not the surviving corporation (other than a merger
          consummated pursuant to a Qualifying Offer), (ii) the
          Company engages in a merger or business combination
          transaction in which the Company is the surviving
          corporation and the Common Stock of the Company is changed
          or exchanged, or (iii) more than 50% of the Company's
          assets or earning power is sold or transferred, each
          holder of a Right (except Rights which have previously
          been voided as set forth above) shall thereafter have the
          right to receive, upon exercise of the Right, common stock
          of the acquiring company having a value equal to two times
          the Exercise Price of the Right.

                    The Purchase Price payable, and the number of
          Units of Preferred Stock or other securities or property
          issuable upon exercise of the Rights are subject to
          adjustment from time to time to prevent dilution (i) in
          the event of a stock dividend on, or a subdivision,
          combination, or reclassification of, the Preferred Stock,
          (ii) if holders of the Preferred Stock are granted certain
          rights or warrants to subscribe for Preferred Stock or
          convertible securities at less than the current market
          price of the Preferred Stock, or (iii) upon the
          distribution to holders of the Preferred Stock of
          evidences of indebtedness or assets (excluding regular
          quarterly cash dividends) or of subscription rights or
          warrants (other than those referred to above).

                    With certain exceptions, no adjustments in the
          Purchase Price will be required until cumulative
          adjustments amount to at least 1% of the Purchase Price. 
          No fractional Units will be issued and, in lieu thereof,
          an adjustment in cash will be made based on the market
          price of the Preferred Stock on the last trading date
          prior to the date of exercise.

                    At any time until ten days following the Stock
          Acquisition Date, the Company may redeem the Rights in
          whole, but not in part, at a price of $0.01 per Right. 
          Immediately upon the action of the Board of Directors
          ordering redemption of the Rights, the Rights will
          terminate and the only right of the holders of Rights will
          be to receive the $0.01 redemption price.

                    Until a Right is exercised, the holder thereof,
          as such, will have no rights as a shareholder of the
          Company, including, without limitation, the right to vote
          or to receive dividends.  While the distribution of the
          Rights will not be taxable to shareholders or to the
          Company, shareholders may, depending upon the
          circumstances, recognize taxable income in the event that
          the Rights become exercisable for Common Shares (or other
          consideration) of the Company as set forth above or in the
          event that the Rights are redeemed.

                    Other than those provisions relating to the
          principal economic terms of the Rights, any of the
          provisions of the Rights Agreement may be amended by the
          Board of Directors of the Company prior to the
          Distribution Date.  After the Distribution Date, the
          provisions of the Rights Agreement may be amended by the
          Board in order to cure any ambiguity, to make changes
          which do not adversely affect the interests of holders of
          Rights (excluding the interest of any Acquiring Person),
          or to shorten or lengthen any time period under the Rights
          Agreement; provided, however, that no amendment to adjust
          the time period governing redemption shall be made at such
          time as the Rights are not redeemable.

                    The Rights may have certain anti-takeover
          effects.  The Rights will cause substantial dilution to a
          person or group that attempts to acquire the Company in a
          manner which causes the Rights to become discount Rights
          unless the offer is conditional on a substantial number of
          Rights being acquired.  The Rights, however, should not
          affect any prospective offeror willing to make an offer at
          a fair price and otherwise in the best interests of the
          Company and its shareholders as determined by a majority
          of the Directors who are not affiliated with the person
          making the offer, or willing to negotiate with the Board. 
          The Rights should not interfere with any merger or other
          business combination approved by the Board since the Board
          may, at its option, at any time until ten days following
          the Stock Acquisition Date redeem all but not less than
          all the then outstanding Rights at the Redemption Price.

                    The Rights Agreement, dated as of September 20,
          1996, between the Company and ChaseMellon Shareholder
          Services L.L.C., as Rights Agent, specifying the terms of
          the Rights is attached hereto as Exhibit 1 and is
          incorporated herein by reference.  The foregoing
          description of the Rights is qualified in its entirety by
          reference to such exhibit.

          ITEM 2.   EXHIBITS.

               1.   Rights Agreement, dated as of September 20,
                    1996, between Regeneron Pharmaceuticals, Inc.
                    and ChaseMellon Shareholder Services L.L.C., as
                    Rights Agent, including the form of Rights
                    Certificate as Exhibit B thereto.

               2.   Press Release, dated September 20, 1996.


                                   SIGNATURE

                    Pursuant to the requirements of Section 12 of
          the Securities Exchange Act of 1934, the Registrant has
          duly caused this registration statement to be signed on
          its behalf by the undersigned, thereunto duly authorized.

          Dated:  October 15, 1996         Regeneron Pharmaceuticals, Inc.

                                           By:/s/ Paul Lubetkin         
                                              ___________________________
                                                 Paul Lubetkin
                                              Vice President, General
                                              Counsel and Secretary


                                 EXHIBIT INDEX

     Exhibit      Description                                          Page

        1.        Rights Agreement, dated as of September 20, 1996,
                  between Regeneron Pharmaceuticals, Inc. and
                  ChaseMellon Shareholder Services L.L.C., as Rights
                  Agent, including the form of Rights Certificate as
                  Exhibit B thereto.

        2.        Press Release, dated September 20, 1996.



                       REGENERON PHARMACEUTICALS, INC.

                                     and

                   CHASEMELLON SHAREHOLDER SERVICES L.L.C.

                                 Rights Agent

                                                 

                               Rights Agreement

                        Dated as of September 20, 1996


                              Table of Contents

          Section                                              Page

             1.  Certain Definitions . . . . . . . . . . . .    2

             2.  Appointment of Rights Agent . . . . . . . .   11

             3.  Issue of Rights Certificates  . . . . . . .   12

             4.  Form of Rights Certificates . . . . . . . .   16

             5.  Countersignature and Registration . . . . .   18

             6.  Transfer, Split Up, Combination and
                  Exchange of Rights Certificates;
                  Mutilated, Destroyed, Lost or Stolen
                  Rights Certificates  . . . . . . . . . . .   20

             7.  Exercise of Rights; Purchase Price;
                  Expiration Date of Rights  . . . . . . . .   22

             8.  Cancellation and Destruction of Rights
                  Certificates . . . . . . . . . . . . . . .   27

             9.  Reservation and Availability of Capital
                  Stock  . . . . . . . . . . . . . . . . . .   28

             10.  Preferred Stock Record Date  . . . . . . .   32

             11.  Adjustment of Purchase Price, Number and
                  Kind of Shares or Number of Rights . . . .   33

             12.  Certificate of Adjusted Purchase Price or
                  Number of Shares . . . . . . . . . . . . .   57

             13.  Consolidation, Merger or Sale or Transfer
                  of Assets or Earning Power . . . . . . . .   58

             14.  Fractional Rights and Fractional Shares  .   64

             15.  Rights of Action . . . . . . . . . . . . .   68

             16.  Agreement of Rights Holders  . . . . . . .   69

             17.  Rights Certificate Holder Not Deemed a
                  Shareholder  . . . . . . . . . . . . . . .   70

             18.  Concerning the Rights Agent  . . . . . . .   71

             19.  Merger or Consolidation or Change of Name
                  of Rights Agent  . . . . . . . . . . . . .   73

             20.  Duties of Rights Agent . . . . . . . . . .   74

             21.  Change of Rights Agent . . . . . . . . . .   79

             22.  Issuance of New Rights Certificates  . . .   82

             23.  Redemption and Termination . . . . . . . .   83

             24.  Notice of Certain Events . . . . . . . . .   85

             25.  Notices  . . . . . . . . . . . . . . . . .   87

             26.  Supplements and Amendments . . . . . . . .   88

             27.  Successors . . . . . . . . . . . . . . . .   90

             28.  Determinations and Actions by the Board of
                  Directors, etc.  . . . . . . . . . . . . .   90

             29.  Benefits of this Agreement . . . . . . . .   92

             30.  Severability . . . . . . . . . . . . . . .   92

             31.  Governing Law  . . . . . . . . . . . . . .   93

             32.  Counterparts . . . . . . . . . . . . . . .   93

             33.  Descriptive Headings . . . . . . . . . . .   93

          Exhibit A -- Certificate of Amendment

          Exhibit B -- Form of Rights Certificate

          Exhibit C -- Form of Summary of Rights


                               RIGHTS AGREEMENT

                    RIGHTS AGREEMENT, dated as of September 20,
          1996 (the "Agreement"), between Regeneron
          Pharmaceuticals, Inc., a New York corporation (the
          "Company"), and ChaseMellon Shareholder Services L.L.C.,
          a New Jersey limited liability company, as Rights Agent
          (the "Rights Agent").

                             W I T N E S S E T H

                    WHEREAS, on September 20, 1996 (the "Rights
          Dividend Declaration Date"), the Board of Directors of
          the Company authorized and declared a dividend
          distribution of one Right for each share of common stock,
          par value $0.001 per share, of the Company (the "Common
          Shares") and for each share of Class A Stock, par value
          $0.001 per share, of the Company (the "Class A Stock"
          and, together with the Common Shares, the "Common Stock")
          outstanding at the close of business on October 18, 1996
          (the "Record Date"), and has authorized the issuance of
          one Right (as such number may hereinafter be adjusted
          pursuant to the provisions of Section 11(p) hereof) for
          each share of Common Stock of the Company issued between
          the Record Date (whether originally issued or delivered
          from the Company's treasury) and the Distribution Date,
          each Right initially representing the right to purchase
          one one-thousandth of a share of Series A Junior
          Participating Preferred Stock (the "Preferred Stock") of
          the Company having the rights, powers and preferences set
          forth in the form of Certificate of Amendment attached
          hereto as Exhibit A, upon the terms and subject to the
          conditions hereinafter set forth (the "Rights"); 

                    NOW, THEREFORE, in consideration of the
          premises and the mutual agreements herein set forth, the
          parties hereby agree as follows: 

                    Section 1.  Certain Definitions.  For purposes
          of this Agreement, the following terms have the meanings
          indicated: 

                         (a)  "Acquiring Person" shall mean any
          Person who or which, together with all Affiliates and
          Associates of such Person, shall be the Beneficial Owner
          of 20% or more of the shares of Common Stock then
          outstanding, but shall not include (i) the Company, (ii)
          any Subsidiary of the Company, (iii) any employee benefit
          plan of the Company or of any Subsidiary of the Company,
          (iv) any Person or entity organized, appointed or
          established by the Company for or pursuant to the terms
          of any such plan, (v) any such Person who has reported or
          is required to report such ownership (but less than 25%)
          on Schedule 13G under the Securities Exchange Act of
          1934, as amended (the "Exchange Act") (or any comparable
          or successor report) or on Schedule 13D under the
          Exchange Act (or any comparable or successor report)
          which Schedule 13D does not state any intention to or
          reserve the right to control or influence the management
          or policies of the Company or engage in any of the
          actions specified in Item 4 of such Schedule (other than
          the disposition of the Common Stock) and, within 10
          Business Days of being requested by the Company to advise
          it regarding the same, certifies to the Company that such
          Person acquired shares of Common Stock in excess of 19.9%
          inadvertently or without knowledge of the terms of the
          Rights and who, together with all Affiliates and
          Associates, thereafter does not acquire additional shares
          of Common Stock while the Beneficial Owner of 20% or more
          of the shares of Common Stock then outstanding; provided,
          however, that if the Person requested to so certify fails
          to do so within 10 Business Days, then such Person shall
          become an Acquiring Person immediately after such 10
          Business Day Period or (vi) an Exempted Person; provided,
          however, that if an Exempted Person shall cease to be an
          Exempted Person, then such Person shall become an
          Acquiring Person if, 10 Business Days following notice by
          the Company to such Person that such Person is no longer
          an Exempted Person, such Person is the Beneficial Owner
          of 20% or more of the shares of Common Stock then
          outstanding.

                         (b)  "Affiliate" and "Associate" shall
          have the respective meanings ascribed to such terms in
          Section 912 of the New York Business Corporation Law, as
          amended and in effect on the date of this Agreement. 

                         (c)  A Person shall be deemed the
          "Beneficial Owner" of, and shall be deemed to
          "beneficially own," any securities: 

                              (i)  which such Person or any of
               such Person's Affiliates or Associates,
               directly or indirectly, has the right to
               acquire (whether such right is exercisable
               immediately or only after the passage of time)
               pursuant to any agreement, arrangement or
               understanding (whether or not in writing) or
               upon the exercise of conversion rights,
               exchange rights, warrants or options, or
               otherwise; provided, however, that a Person
               shall not be deemed the "Beneficial Owner" of,
               or to "beneficially own," (A) securities
               tendered pursuant to a tender or exchange offer
               made by such Person or any of such Person's
               Affiliates or Associates until such tendered
               securities are accepted for purchase or
               exchange, or (B) securities issuable upon
               exercise of Rights at any time prior to the
               occurrence of a Triggering Event, or (C)
               securities issuable upon exercise of Rights
               from and after the occurrence of a Triggering
               Event which Rights were acquired by such Person
               or any of such Person's Affiliates or
               Associates prior to the Distribution Date or
               pursuant to Section 3(a) or Section 22 hereof
               (the "Original Rights") or pursuant to Section
               11(i) hereof in connection with an adjustment
               made with respect to any Original Rights; 

                         (ii)  which such Person or any of
               such Person's Affiliates or Associates,
               directly or indirectly, has the right to vote
               pursuant to any agreement, arrangement or
               understanding, whether or not in writing;
               provided, however, that a Person shall not be
               deemed the "Beneficial Owner" of, or to
               "beneficially own," any security under this
               subparagraph (ii) as a result of an agreement,
               arrangement or understanding to vote such
               security if such agreement, arrangement or
               understanding:  (A) arises solely from a
               revocable proxy or consent given in response to
               a proxy or consent solicitation made in
               accordance with the applicable provisions of
               the General Rules and Regulations under the
               Exchange Act, and (B) is not then reportable by
               such Person on Schedule 13D under the Exchange
               Act (or any comparable or successor report); or

                         (iii)  which are beneficially owned,
               directly or indirectly, by any other Person (or
               any Affiliate or Associate thereof) with which
               such Person (or any of such Person's Affiliates
               or Associates) has any agreement, arrangement
               or understanding (whether or not in writing),
               for the purpose of acquiring, holding, voting
               (except pursuant to a revocable proxy or
               consent as described in the proviso to
               subparagraph (ii) of this paragraph (c)) or
               disposing of any voting securities of the
               Company; provided, however, that nothing in
               this paragraph (c) shall cause a Person engaged
               in business as an underwriter of securities to
               be the "Beneficial Owner" of, or to
               "beneficially own," any securities acquired
               through such person's participation in good
               faith in a firm commitment underwriting until
               the expiration of forty days after the date of
               such acquisition; and provided further,
               however, that any shareholder of the Company,
               with Affiliates, Associates or other person(s)
               who may be deemed representatives of it serving
               as director(s) or officer(s) of the Company,
               shall not be deemed to beneficially own
               securities held by other Persons as a result of
               (i) persons affiliated or otherwise associated
               with such shareholder serving as director(s) or
               officer(s) or taking any action in connection
               therewith, (ii) discussing the status of its
               shares with the Company or other shareholders
               of the Company similarly situated or (iii)
               voting or acting in a manner similar to other
               shareholder(s) similarly situated, absent a
               specific finding by the Board of Directors of
               an express agreement among such shareholders to
               act in concert with one another as shareholders
               so as to cause, in the good faith judgment of
               the Board of Directors, each such shareholder
               to be the Beneficial Owner of the shares held
               by the other shareholder(s).

                         (d)"Business Day" shall mean any day other
          than a Saturday, Sunday or a day on which banking
          institutions in the State of New York are authorized or
          obligated by law or executive order to close.

                         (e)  "Class A Stock" shall mean the Class
          A Stock, par value $0.001 per share, of the Company.

                         (f)  "Close of business" on any given date
          shall mean 5:00 P.M., New York City time, on such date;
          provided, however, that if such date is not a Business
          Day it shall mean 5:00 P.M., New York City time, on the
          next succeeding Business Day.

                         (g)  "Common Shares" shall mean the common
          stock, par value $0.001 per share, of the Company.

                         (h)  "Common Stock" shall mean the Common
          Shares and the Class A Stock, except that "Common Stock"
          when used with reference to any Person other than the
          Company shall mean the capital stock of such Person with
          the greatest voting power, or the equity securities or
          other equity interest having power to control or direct
          the management, of such Person. 

                         (i)  "Exempted Person" shall mean (A)
          Amgen Inc., a Delaware corporation ("Amgen"), unless and
          until such time as (i) Amgen, together with its
          Affiliates, directly or indirectly, acquire or own
          beneficially and/or of record more than 20% of the "Then
          Outstanding Common Stock" of the Company.  "Then
          Outstanding Common Stock" means all of the then issued
          and outstanding shares of Common Stock and all shares of
          Common Stock into which the then outstanding shares of
          preferred stock and any other convertible securities
          (other than the Class A Stock) or any options or warrants
          issued by the Company are convertible, as well as all
          capital stock issued as a result of stock split, stock
          dividend or reclassifications of Common Stock
          distributable, on a pro rata basis, to all holders of
          Common Stock or securities (other than the Class A Stock)
          convertible into capital stock; or (ii) Amgen takes any
          action which at least a majority of the Board of
          Directors determines not to be in accordance with Section
          9 of the Class D Convertible Preferred Stock Purchase
          Agreement dated as of August 31, 1990, between the
          Company and Amgen, in either of which events, Amgen
          immediately shall cease to be an Exempted Person and (B)
          Dr. Leonard S. Schleifer ("Dr. Schleifer") or any
          Permitted Transferee.

                         (j)  "Permitted Transferee" shall mean any
          Person who is a "Permitted Transferee" as defined in the
          Company's Restated Certificate of Incorporation of Dr.
          Schleifer and any direct or indirect Permitted Transferee
          of a Permitted Transferee of Dr. Schleifer; provided, if
          there shall be a change in control of, or any other event
          shall occur with respect to, a Permitted Transferee which
          would require the conversion of such Permitted
          Transferee's shares of Class A Stock into Common Shares,
          such Permitted Transferee will immediately cease to be a
          Permitted Transferee.

                         (k)  "Person" shall mean any individual,
          firm, corporation, partnership or other entity. 

                         (l)  "Preferred Stock" shall mean shares
          of Series A Junior Participating Preferred Stock, par
          value $0.01 per share, of the Company, and, to the extent
          that there are not a sufficient number of shares of
          Series A Junior Participating Preferred Stock authorized
          to permit the full exercise of the Rights, any other
          series of Preferred Stock, par value $0.01 per share, of
          the Company designated for such purpose containing terms
          substantially similar to the terms of the Series A Junior
          Participating Preferred Stock. 

                         (m)  "Section 11(a)(ii) Event" shall mean
          any event described in Section 11(a)(ii) hereof. 

                         (n)  "Section 13 Event" shall mean any
          event described in clauses (x), (y) or (z) of Section
          13(a) hereof. 

                         (o)  "Stock Acquisition Date" shall mean
          the first date of public announcement (which, for
          purposes of this definition, shall include, without
          limitation, a report filed pursuant to Section 13(d)
          under the Exchange Act) by the Company or an Acquiring
          Person that an Acquiring Person has become such. 

                         (p)  "Subsidiary" shall mean, with
          reference to any Person, any corporation of which an
          amount of voting securities sufficient to elect at least
          a majority of the directors of such corporation is
          beneficially owned, directly or indirectly, by such
          Person, or otherwise controlled by such Person. 

                         (q)  "Triggering Event" shall mean any
          Section 11(a)(ii) Event or any Section 13 Event. 

                    Section 2.  Appointment of Rights Agent.  The
          Company hereby appoints the Rights Agent to act as agent
          for the Company and the holders of the Rights (who, in
          accordance with Section 3 hereof, shall prior to the
          Distribution Date also be the holders of the Common
          Stock) in accordance with the terms and conditions
          hereof, and the Rights Agent hereby accepts such
          appointment.  The Company may from time to time appoint
          such co-Rights Agents as it may deem necessary or
          desirable. 

                    Section 3.  Issue of Rights Certificates.   

                         (a)  Until the earlier of (i) the close of
          business on the tenth day after the Stock Acquisition
          Date (or, if the tenth day after the Stock Acquisition
          Date occurs before the Record Date, the close of business
          on the Record Date), or (ii) the close of business on the
          tenth business day (or such later date as the Board shall
          determine) after the date that a tender or exchange offer
          by any Person (other than the Company, any Subsidiary of
          the Company, any employee benefit plan of the Company or
          of any Subsidiary of the Company, or any Person or entity
          organized, appointed or established by the Company for or
          pursuant to the terms of any such plan) is first
          published or sent or given within the meaning of Rule
          14d-2(a) of the General Rules and Regulations under the
          Exchange Act, if upon consummation thereof, such Person
          would be the Beneficial Owner of 20% or more of the
          shares of Common Stock then outstanding (the earlier of
          (i) and (ii) being herein referred to as the
          "Distribution Date"), (x) the Rights will be evidenced
          (subject to the provisions of paragraph (b) of this
          Section 3) by the certificates for the Common Stock
          registered in the names of the holders of the Common
          Stock (which certificates for Common Stock shall be
          deemed also to be certificates for Rights) and not by
          separate certificates, and (y) the Rights will be
          transferable only in connection with the transfer of the
          underlying shares of Common Stock (including a transfer
          to the Company).  As soon as practicable after the
          Distribution Date, the Rights Agent will send by
          first-class, insured, postage prepaid mail, to each
          record holder of the Common Stock as of the close of
          business on the Distribution Date, at the address of such
          holder shown on the records of the Company, one or more
          right certificates, in substantially the form of Exhibit
          B hereto (the "Rights Certificates"), evidencing one
          Right for each share of Common Stock so held, subject to
          adjustment as provided herein.  In the event that an
          adjustment in the number of Rights per share of Common
          Stock has been made pursuant to Section 11(p) hereof, at
          the time of distribution of the Rights Certificates, the
          Company shall make the necessary and appropriate rounding
          adjustments (in accordance with Section 14(a) hereof) so
          that Rights Certificates representing only whole numbers
          of Rights are distributed and cash is paid in lieu of any
          fractional Rights.  As of and after the Distribution
          Date, the Rights will be evidenced solely by such Rights
          Certificates. 

                         (b)  As promptly as practicable following
          the Record Date, the Company will send a copy of a
          Summary of Rights, in substantially the form attached
          hereto as Exhibit C (the "Summary of Rights"), by
          first-class, postage prepaid mail, to each record holder
          of the Common Stock as of the close of business on the
          Record Date, at the address of such holder shown on the
          records of the Company.  With respect to certificates for
          the Common Stock outstanding as of the Record Date, until
          the Distribution Date, the Rights will be evidenced by
          such certificates for the Common Stock and the registered
          holders of the Common Stock shall also be the registered
          holders of the associated Rights.  Until the earlier of
          the Distribution Date or the Expiration Date (as such
          term is defined in Section 7 hereof), the transfer of any
          certificates representing shares of Common Stock in
          respect of which Rights have been issued shall also
          constitute the transfer of the Rights associated with
          such shares of Common Stock. 

                         (c)  Rights shall be issued in respect of
          all shares of Common Stock which are issued (whether
          originally issued or from the Company's treasury) after
          the Record Date but prior to the earlier of the
          Distribution Date or the Expiration Date.  Certificates
          representing such shares of Common Stock shall also be
          deemed to be certificates for Rights, and shall bear the
          following legend:

                    This certificate also evidences and
               entitles the holder hereof to certain Rights as
               set forth in the Rights Agreement between
               Regeneron Pharmaceuticals, Inc. (the "Company")
               and ChaseMellon Shareholder Services L.L.C.
               (the "Rights Agent") dated as of September 20,
               1996 (the "Rights Agreement"), the terms of
               which are hereby incorporated herein by
               reference and a copy of which is on file at the
               principal offices of Regeneron Pharmaceuticals,
               Inc.  Under certain circumstances, as set forth
               in the Rights Agreement, such Rights will be
               evidenced by separate certificates and will no
               longer be evidenced by this certificate. 
               Regeneron Pharmaceuticals, Inc. will mail to
               the holder of this certificate a copy of the
               Rights Agreement, as in effect on the date of
               mailing, without charge promptly after receipt
               of a written request therefor.  Under certain
               circumstances set forth in the Rights
               Agreement, Rights issued to, or held by, any
               Person who is, was or becomes an Acquiring
               Person or any Affiliate or Associate thereof
               (as such terms are defined in the Rights
               Agreement), whether currently held by or on
               behalf of such Person or by any subsequent
               holder, may become null and void.

          With respect to such certificates containing the
          foregoing legend, until the earlier of (i) the
          Distribution Date or (ii) the Expiration Date, the Rights
          associated with the Common Stock represented by such
          certificates shall be evidenced by such certificates
          alone and registered holders of Common Stock shall also
          be the registered holders of the associated Rights, and
          the transfer of any of such certificates shall also
          constitute the transfer of the Rights associated with the
          Common Stock represented by such certificates.

                    Section 4.  Form of Rights Certificates.

                         (a)  The Rights Certificates (and the
          forms of election to purchase and of assignment to be
          printed on the reverse thereof) shall each be
          substantially in the form set forth in Exhibit B hereto
          and may have such marks of identification or designation
          and such legends, summaries or endorsements printed
          thereon as the Company may deem appropriate and as are
          not inconsistent with the provisions of this Agreement,
          or as may be required to comply with any applicable law
          or with any rule or regulation made pursuant thereto or
          with any rule or regulation of any stock exchange on
          which the Rights may from time to time be listed, or to
          conform to usage.  Subject to the provisions of Section
          11 and Section 22 hereof, the Rights Certificates,
          whenever distributed, shall be dated as of the Record
          Date and on their face shall entitle the holders thereof
          to purchase such number of one one-thousandths of a share
          of Preferred Stock as shall be set forth therein at the
          price set forth therein (such exercise price per one
          one-thousandth of a share, the "Purchase Price"), but the
          amount and type of securities purchasable upon the
          exercise of each Right and the Purchase Price thereof
          shall be subject to adjustment as provided herein. 

                         (b)  Any Rights Certificate issued
          pursuant to Section 3(a) or Section 22 hereof that
          represents Rights beneficially owned by:  (i) an
          Acquiring Person or any Associate or Affiliate of an
          Acquiring Person, (ii) a transferee of an Acquiring
          Person (or of any such Associate or Affiliate) who
          becomes a transferee after the Acquiring Person becomes
          such, or (iii) a transferee of an Acquiring Person (or of
          any such Associate or Affiliate) who becomes a transferee
          prior to or concurrently with the Acquiring Person
          becoming such and receives such Rights pursuant to either
          (A) a transfer (whether or not for consideration) from
          the Acquiring Person to holders of equity interests in
          such Acquiring Person or to any Person with whom such
          Acquiring Person has any continuing agreement,
          arrangement or understanding regarding the transferred
          Rights or (B) a transfer which the Board of Directors of
          the Company has determined is part of a plan, arrangement
          or understanding which has as a primary purpose or effect
          avoidance of Section 7(e) hereof, and any Rights
          Certificate issued pursuant to Section 6 or Section 11
          hereof upon transfer, exchange, replacement or adjustment
          of any other Rights Certificate referred to in this
          sentence, shall contain (to the extent feasible) the
          following legend:

               The Rights represented by this Rights
               Certificate are or were beneficially owned by a
               Person who was or became an Acquiring Person or
               an Affiliate or Associate of an Acquiring
               Person (as such terms are defined in the Rights
               Agreement).  Accordingly, this Rights
               Certificate and the Rights represented hereby
               may become null and void in the circumstances
               specified in Section 7(e) of such Agreement.

                    Section 5.  Countersignature and Registration.

                         (a)  The Rights Certificates shall be
          executed on behalf of the Company by its Chairman of the
          Board, its Vice Chairman, its President or any Vice
          President, either manually or by facsimile signature, and
          shall have affixed thereto the Company's seal or a
          facsimile thereof which shall be attested by the
          Secretary or an Assistant Secretary of the Company,
          either manually or by facsimile signature.  The Rights
          Certificates shall be countersigned by the Rights Agent,
          either manually or by facsimile signature and shall not
          be valid for any purpose unless so countersigned.  In
          case any officer of the Company who shall have signed any
          of the Rights Certificates shall cease to be such officer
          of the Company before countersignature by the Rights
          Agent and issuance and delivery by the Company, such
          Rights Certificates, nevertheless, may be countersigned
          by the Rights Agent and issued and delivered by the
          Company with the same force and effect as though the
          person who signed such Rights Certificates had not ceased
          to be such officer of the Company; and any Rights
          Certificates may be signed on behalf of the Company by
          any person who, at the actual date of the execution of
          such Rights Certificate, shall be a proper officer of the
          Company to sign such Rights Certificate, although at the
          date of the execution of this Rights Agreement any such
          person was not such an officer. 

                         (b)  Following the Distribution Date, the
          Rights Agent will keep or cause to be kept, at its
          principal office or offices designated as the appropriate
          place for surrender of Rights Certificates upon exercise
          or transfer, books for registration and transfer of the
          Rights Certificates issued hereunder.  Such books shall
          show the names and addresses of the respective holders of
          the Rights Certificates, the number of Rights evidenced
          on its face by each of the Rights Certificates and the
          date of each of the Rights Certificates. 

                    Section 6.  Transfer, Split Up, Combination and
          Exchange of Rights Certificates; Mutilated, Destroyed,
          Lost or Stolen Rights Certificates.  (a)  Subject to the
          provisions of Section 4(b), Section 7(e) and Section 14
          hereof, at any time after the close of business on the
          Distribution Date, and at or prior to the close of
          business on the Expiration Date, any Rights Certificate
          or Certificates may be transferred, split up, combined or
          exchanged for another Rights Certificate or Certificates,
          entitling the registered holder to purchase a like number
          of one one-thousandths of a share of Preferred Stock (or,
          following a Triggering Event, Common Shares, other
          securities, cash or other assets, as the case may be) as
          the Rights Certificate or Certificates surrendered then
          entitled such holder (or former holder in the case of a
          transfer) to purchase.  Any registered holder desiring to
          transfer, split up, combine or exchange any Rights
          Certificate or Certificates shall make such request in
          writing delivered to the Rights Agent, and shall
          surrender the Rights Certificate or Certificates to be
          transferred, split up, combined or exchanged at the
          principal office or offices of the Rights Agent
          designated for such purpose.  Neither the Rights Agent
          nor the Company shall be obligated to take any action
          whatsoever with respect to the transfer of any such
          surrendered Rights Certificate until the registered
          holder shall have completed and signed the certificate
          contained in the form of assignment on the reverse side
          of such Rights Certificate and shall have provided such
          additional evidence of the identity of the Beneficial
          Owner (or former Beneficial Owner) or Affiliates or
          Associates thereof as the Company shall reasonably
          request.  Thereupon the Rights Agent shall, subject to
          Section 4(b), Section 7(e) and Section 14 hereof,
          countersign and deliver to the Person entitled thereto a
          Rights Certificate or Rights Certificates, as the case
          may be, as so requested.  The Company may require payment
          of a sum sufficient to cover any tax or governmental
          charge that may be imposed in connection with any
          transfer, split up, combination or exchange of Rights
          Certificates. 

                         (b)  Upon receipt by the Company and the
          Rights Agent of evidence reasonably satisfactory to them
          of the loss, theft, destruction or mutilation of a Rights
          Certificate, and, in case of loss, theft or destruction,
          of indemnity or security reasonably satisfactory to them,
          and reimbursement to the Company and the Rights Agent of
          all reasonable expenses incidental thereto, and upon
          surrender to the Rights Agent and cancellation of the
          Rights Certificate if mutilated, the Company will execute
          and deliver a new Rights Certificate of like tenor to the
          Rights Agent for countersignature and delivery to the
          registered owner in lieu of the Rights Certificate so
          lost, stolen, destroyed or mutilated. 

                    Section 7.  Exercise of Rights; Purchase Price;
          Expiration Date of Rights.  (a)  Subject to Section 7(e)
          hereof, the registered holder of any Rights Certificate
          may exercise the Rights evidenced thereby (except as
          otherwise provided herein including, without limitation,
          the restrictions on exercisability set forth in Section
          9(c), Section 11(a)(iii) and Section 23(a) hereof) in
          whole or in part at any time after the Distribution Date
          upon surrender of the Rights Certificate, with the form
          of election to purchase and the certificate on the
          reverse side thereof duly executed, to the Rights Agent
          at the principal office or offices of the Rights Agent
          designated for such purpose, together with payment of the
          aggregate Purchase Price with respect to the total number
          of one one-thousandths of a share (or other securities,
          cash or other assets, as the case may be) as to which
          such surrendered Rights are then exercisable, at or prior
          to the earlier of (i) the close of business on October
          18, 2006, (the "Final Expiration Date"), or (ii) the time
          at which the Rights are redeemed as provided in Section
          23 hereof (the earlier of (i) and (ii) being herein
          referred to as the "Expiration Date"). 

                         (b)  The Purchase Price for each one
          one-thousandth of a share of Preferred Stock pursuant to
          the exercise of a Right shall initially be $120.00, and
          shall be subject to adjustment from time to time as
          provided in Sections 11 and 13(a) hereof and shall be
          payable in accordance with paragraph (c) below. 

                         (c)  Upon receipt of a Rights Certificate
          representing exercisable Rights, with the form of
          election to purchase and the certificate duly executed,
          accompanied by payment, with respect to each Right so
          exercised, of the Purchase Price per one one-thousandth
          of a share of Preferred Stock (or other shares,
          securities, cash or other assets, as the case may be) to
          be purchased as set forth below and an amount equal to
          any applicable transfer tax, the Rights Agent shall,
          subject to Section 20(k) hereof, thereupon promptly (i)
          (A) requisition from any transfer agent of the shares of
          Preferred Stock (or make available, if the Rights Agent
          is the transfer agent for such shares) certificates for
          the total number of one one-thousandths of a share of
          Preferred Stock to be purchased and the Company hereby
          irrevocably authorizes its transfer agent to comply with
          all such requests, or (B) if the Company shall have
          elected to deposit the total number of shares of
          Preferred Stock issuable upon exercise of the Rights
          hereunder with a depositary agent, requisition from the
          depositary agent depositary receipts representing such
          number of one one-thousandths of a share of Preferred
          Stock as are to be purchased (in which case certificates
          for the shares of Preferred Stock represented by such
          receipts shall be deposited by the transfer agent with
          the depositary agent) and the Company will direct the
          depositary agent to comply with such request, (ii)
          requisition from the Company the amount of cash, if any,
          to be paid in lieu of fractional shares in accordance
          with Section 14 hereof, (iii) after receipt of such
          certificates or depositary receipts, cause the same to be
          delivered to, or upon the order of, the registered holder
          of such Rights Certificate, registered in such name or
          names as may be designated by such holder, and (iv) after
          receipt thereof, deliver such cash, if any, to, or upon
          the order of, the registered holder of such Rights
          Certificate.  The payment of the Purchase Price (as such
          amount may be reduced pursuant to Section 11(a)(iii)
          hereof) shall be made in cash or by certified bank check
          or bank draft payable to the order of the Company.  In
          the event that the Company is obligated to issue other
          securities (including Common Shares) of the Company, pay
          cash and/or distribute other property pursuant to Section
          11(a) hereof, the Company will make all arrangements
          necessary so that such other securities, cash and/or
          other property are available for distribution by the
          Rights Agent, if and when appropriate.  The Company
          reserves the right to require prior to the occurrence of
          a Triggering Event that, upon any exercise of Rights, a
          number of Rights be exercised so that only whole shares
          of Preferred Stock would be issued. 

                         (d)  In case the registered holder of any
          Rights Certificate shall exercise less than all the
          Rights evidenced thereby, a new Rights Certificate
          evidencing Rights equivalent to the Rights remaining
          unexercised shall be issued by the Rights Agent and
          delivered to, or upon the order of, the registered holder
          of such Rights Certificate, registered in such name or
          names as may be designated by such holder, subject to the
          provisions of Section 14 hereof. 

                         (e)  Notwithstanding anything in this
          Agreement to the contrary, from and after the first
          occurrence of a Section 11(a)(ii) Event, any Rights
          beneficially owned by (i) an Acquiring Person or an
          Associate or Affiliate of an Acquiring Person, (ii) a
          transferee of an Acquiring Person (or of any such
          Associate or Affiliate) who becomes a transferee after
          the Acquiring Person becomes such, or (iii) a transferee
          of an Acquiring Person (or of any such Associate or
          Affiliate) who becomes a transferee prior to or
          concurrently with the Acquiring Person becoming such and
          receives such Rights pursuant to either (A) a transfer
          (whether or not for consideration) from the Acquiring
          Person to holders of equity interests in such Acquiring
          Person or to any Person with whom the Acquiring Person
          has any continuing agreement, arrangement or
          understanding regarding the transferred Rights or (B) a
          transfer which a majority of the Board of Directors of
          the Company has determined is part of a plan, arrangement
          or understanding which has as a primary purpose or effect
          the avoidance of this Section 7(e), shall become null and
          void without any further action and no holder of such
          Rights shall have any rights whatsoever with respect to
          such Rights, whether under any provision of this
          Agreement or otherwise.  The Company shall use all
          reasonable efforts to insure that the provisions of this
          Section 7(e) and Section 4(b) hereof are complied with,
          but shall have no liability to any holder of Rights
          Certificates or other Person as a result of its failure
          to make any determinations with respect to an Acquiring
          Person or its Affiliates, Associates or transferees
          hereunder. 

                         (f)  Notwithstanding anything in this
          Agreement to the contrary, neither the Rights Agent nor
          the Company shall be obligated to undertake any action
          with respect to a registered holder upon the occurrence
          of any purported exercise as set forth in this Section 7
          unless such registered holder shall have (i) completed
          and signed the certificate contained in the form of
          election to purchase set forth on the reverse side of the
          Rights Certificate surrendered for such exercise, and
          (ii) provided such additional evidence of the identity of
          the Beneficial Owner (or former Beneficial Owner) or
          Affiliates or Associates thereof as the Company shall
          reasonably request. 

                    Section 8.  Cancellation and Destruction of
          Rights Certificates.  All Rights Certificates surrendered
          for the purpose of exercise, transfer, split up,
          combination or exchange shall, if surrendered to the
          Company or any of its agents, be delivered to the Rights
          Agent for cancellation or in cancelled form, or, if
          surrendered to the Rights Agent, shall be cancelled by
          it, and no Rights Certificates shall be issued in lieu
          thereof except as expressly permitted by any of the
          provisions of this Agreement.  The Company shall deliver
          to the Rights Agent for cancellation and retirement, and
          the Rights Agent shall so cancel and retire, any other
          Rights Certificate purchased or acquired by the Company
          otherwise than upon the exercise thereof.  The Rights
          Agent shall deliver all cancelled Rights Certificates to
          the Company, or shall, at the written request of the
          Company, destroy such cancelled Rights Certificates, and
          in such case shall deliver a certificate of destruction
          thereof to the Company. 

                    Section 9.  Reservation and Availability of
          Capital Stock.  (a)  The Company covenants and agrees
          that it will cause to be reserved and kept available out
          of its authorized and unissued shares of Preferred Stock
          (and, following the occurrence of a Triggering Event, out
          of its authorized and unissued Common Shares and/or other
          securities or out of its authorized and issued shares
          held in its treasury), the number of shares of Preferred
          Stock (and, following the occurrence of a Triggering
          Event, Common Shares and/or other securities) that, as
          provided in this Agreement including Section 11(a)(iii)
          hereof, will be sufficient to permit the exercise in full
          of all outstanding Rights. 

                         (b)  So long as the shares of Preferred
          Stock (and, following the occurrence of a Triggering
          Event, Common Shares and/or other securities) issuable
          and deliverable upon the exercise of the Rights may be
          listed on any national securities exchange, the Company
          shall use its best efforts to cause, from and after such
          time as the Rights become exercisable, all shares
          reserved for such issuance to be listed on such exchange
          upon official notice of issuance upon such exercise. 

                         (c)  The Company shall use its best
          efforts to (i) file, as soon as practicable following the
          earliest date after the first occurrence of a Section
          11(a)(ii) Event on which the consideration to be
          delivered by the Company upon exercise of the Rights has
          been determined in accordance with Section 11(a)(iii)
          hereof, a registration statement under the Securities Act
          of 1933 (the "Act"), with respect to the securities
          purchasable upon exercise of the Rights on an appropriate
          form, (ii) cause such registration statement to become
          effective as soon as practicable after such filing, and
          (iii) cause such registration statement to remain
          effective (with a prospectus at all times meeting the
          requirements of the Act) until the earlier of (A) the
          date as of which the Rights are no longer exercisable for
          such securities, and (B) the date of the expiration of
          the Rights.  The Company will also take such action as
          may be appropriate under, or to ensure compliance with,
          the securities or "blue sky" laws of the various states
          in connection with the exercisability of the Rights.  The
          Company may temporarily suspend, for a period of time not
          to exceed ninety (90) days after the date set forth in
          clause (i) of the first sentence of this Section 9(c),
          the exercisability of the Rights in order to prepare and
          file such registration statement and permit it to become
          effective.  Upon any such suspension, the Company shall
          issue a public announcement stating that the
          exercisability of the Rights has been temporarily
          suspended, as well as a public announcement at such time
          as the suspension is no longer in effect.  In addition,
          if the Company shall determine that a registration
          statement is required following the Distribution Date,
          the Company may temporarily suspend the exercisability of
          the Rights until such time as a registration statement
          has been declared effective.  Notwithstanding any
          provision of this Agreement to the contrary, the Rights
          shall not be exercisable in any jurisdiction if the
          requisite qualification in such jurisdiction shall not
          have been obtained, the exercise thereof shall not be
          permitted under applicable law or a registration
          statement shall not have been declared effective. 

                         (d)  The Company covenants and agrees that
          it will take all such action as may be necessary to
          ensure that all one one-thousandths of a share of
          Preferred Stock (and, following the occurrence of a
          Triggering Event, Common Shares and/or other securities)
          delivered upon exercise of Rights shall, at the time of
          delivery of the certificates for such shares (subject to
          payment of the Purchase Price), be duly and validly
          authorized and issued and fully paid and nonassessable. 

                         (e)  The Company further covenants and
          agrees that it will pay when due and payable any and all
          federal and state transfer taxes and charges which may be
          payable in respect of the issuance or delivery of the
          Rights Certificates and of any certificates for a number
          of one one-thousandths of a share of Preferred Stock (or
          Common Shares and/or other securities, as the case may
          be) upon the exercise of Rights.  The Company shall not,
          however, be required to pay any transfer tax which may be
          payable in respect of any transfer or delivery of Rights
          Certificates to a Person other than, or the issuance or
          delivery of a number of one one-thousandths of a share of
          Preferred Stock (or Common Shares and/or other
          securities, as the case may be) in respect of a name
          other than that of, the registered holder of the Rights
          Certificates evidencing Rights surrendered for exercise
          or to issue or deliver any certificates for a number of
          one one-thousandths of a share of Preferred Stock (or
          Common Shares and/or other securities, as the case may
          be) in a name other than that of the registered holder
          upon the exercise of any Rights until such tax shall have
          been paid (any such tax being payable by the holder of
          such Rights Certificate at the time of surrender) or
          until it has been established to the Company's
          satisfaction that no such tax is due. 

                    Section 10.  Preferred Stock Record Date.  Each
          person in whose name any certificate for a number of one
          one-thousandths of a share of Preferred Stock (or Common
          Shares and/or other securities, as the case may be) is
          issued upon the exercise of Rights shall for all purposes
          be deemed to have become the holder of record of such
          fractional shares of Preferred Stock (or Common Shares
          and/or other securities, as the case may be) represented
          thereby on, and such certificate shall be dated, the date
          upon which the Rights Certificate evidencing such Rights
          was duly surrendered and payment of the Purchase Price
          (and all applicable transfer taxes) was made; provided,
          however, that if the date of such surrender and payment
          is a date upon which the Preferred Stock (or Common
          Shares and/or other securities, as the case may be)
          transfer books of the Company are closed, such Person
          shall be deemed to have become the record holder of such
          shares (fractional or otherwise) on, and such certificate
          shall be dated, the next succeeding Business Day on which
          the Preferred Stock (or Common Shares and/or other
          securities, as the case may be) transfer books of the
          Company are open.  Prior to the exercise of the Rights
          evidenced thereby, the holder of a Rights Certificate
          shall not be entitled to any rights of a shareholder of
          the Company with respect to shares for which the Rights
          shall be exercisable, including, without limitation, the
          right to vote, to receive dividends or other
          distributions or to exercise any preemptive rights, and
          shall not be entitled to receive any notice of any
          proceedings of the Company, except as provided herein.

                    Section 11.  Adjustment of Purchase Price,
          Number and Kind of Shares or Number of Rights.  The
          Purchase Price, the number and kind of shares covered by
          each Right and the number of Rights outstanding are
          subject to adjustment from time to time as provided in
          this Section 11. 

                              (a)(i)  In the event the Company
               shall at any time after the date of this
               Agreement (A) declare a dividend on the
               Preferred Stock payable in shares of Preferred
               Stock, (B) subdivide the outstanding Preferred
               Stock, (C) combine the outstanding Preferred
               Stock into a smaller number of shares, or (D)
               issue any shares of its capital stock in a
               reclassification of the Preferred Stock
               (including any such reclassification in
               connection with a consolidation or merger in
               which the Company is the continuing or
               surviving corporation), except as otherwise
               provided in this Section 11(a) and Section 7(e)
               hereof, the Purchase Price in effect at the
               time of the record date for such dividend or of
               the effective date of such subdivision,
               combination or reclassification, and the number
               and kind of shares of Preferred Stock or
               capital stock, as the case may be, issuable on
               such date, shall be proportionately adjusted so
               that the holder of any Right exercised after
               such time shall be entitled to receive, upon
               payment of the Purchase Price then in effect,
               the aggregate number and kind of shares of
               Preferred Stock or capital stock, as the case
               may be, which, if such Right had been exercised
               immediately prior to such date and at a time
               when the Preferred Stock transfer books of the
               Company were open, he or she would have owned
               upon such exercise and been entitled to receive
               by virtue of such dividend, subdivision,
               combination or reclassification.  If an event
               occurs which would require an adjustment under
               both this Section 11(a)(i) and Section
               11(a)(ii) hereof, the adjustment provided for
               in this Section 11(a)(i) shall be in addition
               to, and shall be made prior to, any adjustment
               required pursuant to Section 11(a)(ii) hereof.

                         (ii) In the event that any Person
               (other than the Company, any Subsidiary of the
               Company, any employee benefit plan of the
               Company or of any Subsidiary of the Company,
               any Person or entity organized, appointed or
               established by the Company for or pursuant to
               the terms of any such plan, or an Exempted
               Person), alone or together with its Affiliates
               and Associates, shall, at any time after the
               Rights Dividend Declaration Date, become the
               Beneficial Owner of 20% or more of the shares
               of Common Stock then outstanding, unless the
               event causing the 20% threshold to be crossed
               is a transaction set forth in Section 13(a)
               hereof, or is an acquisition of shares of
               Common Stock pursuant to a tender offer or an
               exchange offer for all outstanding shares of
               Common Stock at a price and on terms determined
               by at least a majority of the members of the
               Board of Directors who are not officers of the
               Company and who are not representatives,
               nominees, Affiliates or Associates of an
               Acquiring Person, after receiving advice from
               one or more investment banking firms, to be (a)
               at a price which is fair to shareholders
               (taking into account all factors which such
               members of the Board deem relevant including,
               without limitation, prices which could
               reasonably be achieved if the Company or its
               assets were sold on an orderly basis designed
               to realize maximum value) and (b) otherwise in
               the best interests of the Company and its
               shareholders (hereinafter, a "Qualifying
               Offer"), then, promptly following the
               occurrence of any such event, proper provision
               shall be made so that each holder of a Right
               (except as provided below and in Section 7(e)
               hereof) shall thereafter have the right to
               receive, upon exercise thereof at the then
               current Purchase Price in accordance with the
               terms of this Agreement, in lieu of a number of
               one one-thousandths of a share of Preferred
               Stock, such number of Common Shares of the
               Company as shall equal the result obtained by
               (x) multiplying the then current Purchase Price
               by the then number of one one-thousandths of a
               share of Preferred Stock for which a Right was
               exercisable immediately prior to the first
               occurrence of a Section 11(a)(ii) Event, and
               (y) dividing that product (which, following
               such first occurrence, shall thereafter be
               referred to as the "Purchase Price" for each
               Right and for all purposes of this Agreement)
               by 50% of the current market price (determined
               pursuant to Section 11(d) hereof) per Common
               Share on the date of such first occurrence
               (such number of shares, the "Adjustment
               Shares").

                         (iii)  In the event that the number
               of Common Shares which are authorized by the
               Company's Restated Certificate of
               Incorporation, as amended, but not outstanding
               or reserved for issuance for purposes other
               than upon exercise of the Rights are not
               sufficient to permit the exercise in full of
               the Rights in accordance with the foregoing
               subparagraph (ii) of this Section 11(a), the
               Company shall (A) determine the value of the
               Adjustment Shares issuable upon the exercise of
               a Right (the "Current Value"), and (B) with
               respect to each Right (subject to Section 7(e)
               hereof), make adequate provision to substitute
               for the Adjustment Shares, upon the exercise of
               a Right and payment of the applicable Purchase
               Price, (1) cash, (2) a reduction in the
               Purchase Price, (3) Common Shares or other
               equity securities of the Company (including,
               without limitation, shares, or units of shares,
               of preferred stock, such as the Preferred
               Stock, which the Board has deemed to have
               essentially the same value or economic rights
               as Common Shares (such shares of preferred
               stock being referred to as "Common Share
               Equivalents")), (4) debt securities of the
               Company, (5) other assets, or (6) any
               combination of the foregoing, having an
               aggregate value equal to the Current Value
               (less the amount of any reduction in the
               Purchase Price), where such aggregate value has
               been determined by the Board based upon the
               advice of a nationally recognized investment
               banking firm selected by the Board; provided,
               however, that if the Company shall not have
               made adequate provision to deliver value
               pursuant to clause (B) above within thirty (30)
               days following the later of (x) the first
               occurrence of a Section 11(a)(ii) Event and (y)
               the date on which the Company's right of
               redemption pursuant to Section 23(a) expires
               (the later of (x) and (y) being referred to
               herein as the "Section 11(a)(ii) Trigger
               Date"), then the Company shall be obligated to
               deliver, upon the surrender for exercise of a
               Right and without requiring payment of the
               Purchase Price, Common Shares (to the extent
               available) and then, if necessary, cash, which
               shares and/or cash have an aggregate value
               equal to the Spread.  For purposes of the
               preceding sentence, the term "Spread" shall
               mean the excess of (i) the Current Value over
               (ii) the Purchase Price.  If the Board
               determines in good faith that it is likely that
               sufficient additional Common Shares could be
               authorized for issuance upon exercise in full
               of the Rights, the thirty (30) day period set
               forth above may be extended to the extent
               necessary, but not more than ninety (90) days
               after the Section 11(a)(ii) Trigger Date, in
               order that the Company may seek shareholder
               approval for the authorization of such
               additional shares (such thirty (30) day period,
               as it may be extended, is herein called the
               "Substitution Period").  To the extent that
               action is to be taken pursuant to the first
               and/or third sentences of this Section
               11(a)(iii), the Company (1) shall provide,
               subject to Section 7(e) hereof, that such
               action shall apply uniformly to all outstanding
               Rights, and (2) may suspend the exercisability
               of the Rights until the expiration of the
               Substitution Period in order to seek such
               shareholder approval for such authorization of
               additional shares and/or to decide the
               appropriate form of distribution to be made
               pursuant to such first sentence and to
               determine the value thereof.  In the event of
               any such suspension, the Company shall issue a
               public announcement stating that the
               exercisability of the Rights has been
               temporarily suspended, as well as a public
               announcement at such time as the suspension is
               no longer in effect.  For purposes of this
               Section 11(a)(iii), the value of each
               Adjustment Share shall be the Current Market
               Price per Common Share on the Section 11(a)(ii)
               Trigger Date and the per share or per unit
               value of any Common Share Equivalent shall be
               deemed to equal the Current Market Price per
               Common Share on such date.

                         (b)  In case the Company shall fix a
          record date for the issuance of rights, options or
          warrants to all holders of Preferred Stock entitling them
          to subscribe for or purchase (for a period expiring
          within  forty-five (45) calendar days after such record
          date) Preferred Stock (or shares having the same rights,
          privileges and preferences as the shares of Preferred
          Stock ("equivalent preferred stock")) or securities
          convertible into Preferred Stock or equivalent preferred
          stock at a price per share of Preferred Stock or per
          share of equivalent preferred stock (or having a
          conversion price per share, if a security convertible
          into Preferred Stock or equivalent preferred stock) less
          than the current market price (as determined pursuant to
          Section 11(d) hereof) per share of Preferred Stock on
          such record date, the Purchase Price to be in effect
          after such record date shall be determined by multiplying
          the Purchase Price in effect immediately prior to such
          record date by a fraction, the numerator of which shall
          be the number of shares of Preferred Stock outstanding on
          such record date, plus the number of shares of Preferred
          Stock which the aggregate offering price of the total
          number of shares of Preferred Stock and/or equivalent
          preferred stock so to be offered (and/or the aggregate
          initial conversion price of the convertible securities so
          to be offered) would purchase at such current market
          price, and the denominator of which shall be the number
          of shares of Preferred Stock outstanding on such record
          date, plus the number of additional shares of Preferred
          Stock and/or equivalent preferred stock to be offered for
          subscription or purchase (or into which the convertible
          securities so to be offered are initially convertible). 
          In case such subscription price may be paid by delivery
          of consideration part or all of which may be in a form
          other than cash, the value of such consideration shall be
          as determined in good faith by the Board of Directors of
          the Company, whose determination shall be described in a
          statement filed with the Rights Agent and shall be
          binding on the Rights Agent and the holders of the
          Rights.  Shares of Preferred Stock owned by or held for
          the account of the Company shall not be deemed
          outstanding for the purpose of any such computation. 
          Such adjustment shall be made successively whenever such
          a record date is fixed, and in the event that such rights
          or warrants are not so issued, the Purchase Price shall
          be adjusted to be the Purchase Price which would then be
          in effect if such record date had not been fixed. 

                         (c)  In case the Company shall fix a
          record date for a distribution to all holders of
          Preferred Stock (including any such distribution made in
          connection with a consolidation or merger in which the
          Company is the continuing corporation) of evidences of
          indebtedness, cash (other than a regular quarterly cash
          dividend out of the earnings or retained earnings of the
          Company), assets (other than a dividend payable in
          Preferred Stock, but including any dividend payable in
          stock other than Preferred Stock) or subscription rights
          or warrants (excluding those referred to in Section 11(b)
          hereof), the Purchase Price to be in effect after such
          record date shall be determined by multiplying the
          Purchase Price in effect immediately prior to such record
          date by a fraction, the numerator of which shall be the
          current market price (as determined pursuant to Section
          11(d) hereof) per share of Preferred Stock on such record
          date, less the fair market value (as determined in good
          faith by the Board of Directors of the Company, whose
          determination shall be described in a statement filed
          with the Rights Agent) of the portion of the cash, assets
          or evidences of indebtedness so to be distributed or of
          such subscription rights or warrants applicable to a
          share of Preferred Stock and the denominator of which
          shall be such current market price (as determined
          pursuant to Section 11(d) hereof) per share of Preferred
          Stock.  Such adjustments shall be made successively
          whenever such a record date is fixed, and in the event
          that such distribution is not so made, the Purchase Price
          shall be adjusted to be the Purchase Price which would
          have been in effect if such record date had not been
          fixed. 

                         (d)  (i)  For the purpose of any
          computation hereunder, other than computations made
          pursuant to Section 11(a)(iii) hereof, the Current Market
          Price per Common Share on any date shall be deemed to be
          the average of the daily closing prices per such Common
          Share for the thirty (30) consecutive Trading Days
          immediately prior to such date, and for purposes of
          computations made pursuant to Section 11(a)(iii) hereof,
          the Current Market Price per Common Share on any date
          shall be deemed to be the average of the daily closing
          prices per such Common Share for the ten (10) consecutive
          Trading Days immediately following such date; provided,
          however, that in the event that the Current Market Price
          per Common Share is determined during a period following
          the announcement by the issuer of such Common Share of
          (A) a dividend or distribution on such Common Share
          payable in such Common Shares or securities convertible
          into shares of such Common Shares (other than the
          Rights), or (B) any subdivision, combination or
          reclassification of such Common Shares, and the
          ex-dividend date for such dividend or distribution, or
          the record date for such subdivision, combination or
          reclassification shall not have occurred prior to the
          commencement of the requisite thirty (30) Trading Day or
          ten (10) Trading Day period, as set forth above, then,
          and in each such case, the Current Market Price shall be
          properly adjusted to take into account ex-dividend
          trading.  The closing price for each day shall be the
          last sale price, regular way, or, in case no such sale
          takes place on such day, the average of the closing bid
          and asked prices, regular way, in either case as reported
          in the principal consolidated transaction reporting
          system with respect to securities listed or admitted to
          trading on the New York Stock Exchange or, if the Common
          Shares are not listed or admitted to trading on the New
          York Stock Exchange, as reported in the principal
          consolidated transaction reporting system with respect to
          securities listed on the principal national securities
          exchange on which the Common Shares are listed or
          admitted to trading or, if the Common Shares are not
          listed or admitted to trading on any national securities
          exchange, the last quoted price or, if not so quoted, the
          average of the high bid and low asked prices in the
          over-the-counter market, as reported by the National
          Association of Securities Dealers, Inc. Automated
          Quotation System (the "NASDAQ") or such other system then
          in use, or, if on any such date the Common Shares are not
          quoted by any such organization, the average of the
          closing bid and asked prices as furnished by a
          professional market maker making a market in the Common
          Shares selected by the Board.  If on any such date no
          market maker is making a market in the Common Shares, the
          fair value of such shares on such date as determined in
          good faith by the Board shall be used.  The term "Trading
          Day" shall mean a day on which the principal national
          securities exchange on which the Common Shares are listed
          or admitted to trading is open for the transaction of
          business or, if the Common Shares are not listed or
          admitted to trading on any national securities exchange,
          a Business Day.  If the Common Shares are not publicly
          held or not so listed or traded, Current Market Price per
          share shall mean the fair value per share as determined
          in good faith by the Board, whose determination shall be
          described in a statement filed with the Rights Agent and
          shall be conclusive for all purposes. 

                         (ii)  For the purpose of any computation
          hereunder, the Current Market Price per share of
          Preferred Stock shall be determined in the same manner as
          set forth above for the Common Shares in clause (i) of
          this Section 11(d) (other than the last sentence
          thereof).  If the Current Market Price per share of
          Preferred Stock cannot be determined in the manner
          provided above or if the Preferred Stock is not publicly
          held or listed or traded in a manner described in clause
          (i) of this Section 11(d), the Current Market Price per
          share of Preferred Stock shall be conclusively deemed to
          be an amount equal to 1,000 (as such number may be
          appropriately adjusted for such events as stock splits,
          stock dividends and recapitalizations with respect to the
          Common Shares occurring after the date of this Agreement)
          multiplied by the Current Market Price per Common Share. 
          If neither the Common Share nor the Preferred Stock is
          publicly held or so listed or traded, Current Market
          Price per share of the Preferred Stock shall mean the
          fair value per share as determined in good faith by the
          Board, whose determination shall be described in a
          statement filed with the Rights Agent and shall be
          conclusive for all purposes.

                         (e)  Anything herein to the contrary
          notwithstanding, no adjustment in the Purchase Price
          shall be required unless such adjustment would require an
          increase or decrease of at least one percent (1%) in the
          Purchase Price; provided, however, that any adjustments
          which by reason of this Section 11(e) are not required to
          be made shall be carried forward and taken into account
          in any subsequent adjustment.  All calculations under
          this Section 11 shall be made to the nearest cent or to
          the nearest ten-thousandth of a Common Share or other
          share or one-ten millionth of a share of Preferred Stock,
          as the case may be.  Notwithstanding the first sentence
          of this Section 11(e), any adjustment required by this
          Section 11 shall be made no later than the earlier of (i)
          three (3) years from the date of the transaction which
          mandates such adjustment, or (ii) the Expiration Date. 

                         (f)  If as a result of an adjustment made
          pursuant to Section 11(a)(ii) or Section 13(a) hereof,
          the holder of any Right thereafter exercised shall become
          entitled to receive any shares of capital stock other
          than Preferred Stock, thereafter the number of such other
          shares so receivable upon exercise of any Right and the
          Purchase Price thereof shall be subject to adjustment
          from time to time in a manner and on terms as nearly
          equivalent as practicable to the provisions with respect
          to the Preferred Stock contained in Sections 11(a), (b),
          (c), (e), (g), (h), (i), (j), (k) and (m), and the
          provisions of Sections 7, 9, 10, 13 and 14 hereof with
          respect to the Preferred Stock shall apply on like terms
          to any such other shares. 

                         (g)  All Rights originally issued by the
          Company subsequent to any adjustment made to the Purchase
          Price hereunder shall evidence the right to purchase, at
          the adjusted Purchase Price, the number of one
          one-thousandths of a share of Preferred Stock purchasable
          from time to time hereunder upon exercise of the Rights,
          all subject to further adjustment as provided herein. 

                         (h)  Unless the Company shall have
          exercised its election as provided in Section 11(i), upon
          each adjustment of the Purchase Price as a result of the
          calculations made in Sections 11(b) and (c), each Right
          outstanding immediately prior to the making of such
          adjustment shall thereafter evidence the right to
          purchase, at the adjusted Purchase Price, that number of
          one one-thousandths of a share of Preferred Stock
          (calculated to the nearest one-ten millionth) obtained by
          (i) multiplying (x) the number of one one-thousandths of
          a share covered by a Right immediately prior to this
          adjustment, by (y) the Purchase Price in effect
          immediately prior to such adjustment of the Purchase
          Price, and (ii) dividing the product so obtained by the
          Purchase Price in effect immediately after such
          adjustment of the Purchase Price. 

                         (i)  The Company may elect on or after the
          date of any adjustment of the Purchase Price to adjust
          the number of Rights, in lieu of any adjustment in the
          number of one one-thousandths of a share of Preferred
          Stock purchasable upon the exercise of a Right.  Each of
          the Rights outstanding after the adjustment in the number
          of Rights shall be exercisable for the number of one
          one-thousandths of a share of Preferred Stock for which a
          Right was exercisable immediately prior to such
          adjustment.  Each Right held of record prior to such
          adjustment of the number of Rights shall become that
          number of Rights (calculated to the nearest
          one-ten-thousandth) obtained by dividing the Purchase
          Price in effect immediately prior to adjustment of the
          Purchase Price by the Purchase Price in effect
          immediately after adjustment of the Purchase Price.  The
          Company shall make a public announcement of its election
          to adjust the number of Rights, indicating the record
          date for the adjustment, and, if known at the time, the
          amount of the adjustment to be made.  This record date
          may be the date on which the Purchase Price is adjusted
          or any day thereafter, but, if the Rights Certificates
          have been issued, shall be at least ten (10) days later
          than the date of the public announcement.  If Rights
          Certificates have been issued, upon each adjustment of
          the number of Rights pursuant to this Section 11(i), the
          Company shall, as promptly as practicable, cause to be
          distributed to holders of record of Rights Certificates
          on such record date Rights Certificates evidencing,
          subject to Section 14 hereof, the additional Rights to
          which such holders shall be entitled as a result of such
          adjustment, or, at the option of the Company, shall cause
          to be distributed to such holders of record in
          substitution and replacement for the Rights Certificates
          held by such holders prior to the date of adjustment, and
          upon surrender thereof, if required by the Company, new
          Rights Certificates evidencing all the Rights to which
          such holders shall be entitled after such adjustment. 
          Rights Certificates so to be distributed shall be issued,
          executed and countersigned in the manner provided for
          herein (and may bear, at the option of the Company, the
          adjusted Purchase Price) and shall be registered in the
          names of the holders of record of Rights Certificates on
          the record date specified in the public announcement. 

                         (j)  Irrespective of any adjustment or
          change in the Purchase Price or the number of one one-
          thousandth of a share of Preferred Stock issuable upon
          the exercise of the Rights, the Rights Certificates
          theretofore and thereafter issued may continue to express
          the Purchase Price per one one-thousandth of a share and
          the number of one one-thousandth of a share which were
          expressed in the initial Rights Certificates issued
          hereunder. 

                         (k)  Before taking any action that would
          cause an adjustment reducing the Purchase Price below the
          then stated value, if any, of the number of one
          one-thousandths of a share of Preferred Stock issuable
          upon exercise of the Rights, the Company shall take any
          corporate action which may, in the opinion of its
          counsel, be necessary in order that the Company may
          validly and legally issue fully paid and nonassessable
          such number of one one-thousandth of a share of Preferred
          Stock at such adjusted Purchase Price. 

                         (l)  In any case in which this Section 11
          shall require that an adjustment in the Purchase Price be
          made effective as of a record date for a specified event,
          the Company may elect to defer until the occurrence of
          such event the issuance to the holder of any Right
          exercised after such record date the number of one
          one-thousandths of a share of Preferred Stock and other
          capital stock or securities of the Company, if any,
          issuable upon such exercise over and above the number of
          one one-thousandths of a share of Preferred Stock and
          other capital stock or securities of the Company, if any,
          issuable upon such exercise on the basis of the Purchase
          Price in effect prior to such adjustment; provided,
          however, that the Company shall deliver to such holder a
          due bill or other appropriate instrument evidencing such
          holder's right to receive such additional shares
          (fractional or otherwise) or securities upon the
          occurrence of the event requiring such adjustment. 

                         (m)  Anything in this Section 11 to the
          contrary notwithstanding, the Company shall be entitled
          to make such reductions in the Purchase Price, in
          addition to those adjustments expressly required by this
          Section 11, as and to the extent that in their good faith
          judgment the Board of Directors of the Company shall
          determine to be advisable in order that any (i)
          consolidation or subdivision of the Preferred Stock, (ii)
          issuance wholly for cash of any shares of Preferred Stock
          at less than the current market price, (iii) issuance
          wholly for cash of shares of Preferred Stock or
          securities which by their terms are convertible into or
          exchangeable for shares of Preferred Stock, (iv) stock
          dividends or (v) issuance of rights, options or warrants
          referred to in this Section 11, hereafter made by the
          Company to holders of its Preferred Stock shall not be
          taxable to such shareholders. 

                         (n)  The Company covenants and agrees that
          it shall not, at any time after the Distribution Date,
          (i) consolidate with any other Person (other than a
          Subsidiary of the Company in a transaction which complies
          with Section 11(o) hereof), (ii) merge with or into any
          other Person (other than a Subsidiary of the Company in a
          transaction which complies with Section 11(o) hereof), or
          (iii) sell or transfer (or permit any Subsidiary to sell
          or transfer), in one transaction, or a series of related
          transactions, assets or earning power aggregating more
          than 50% of the assets or earning power of the Company
          and its Subsidiaries (taken as a whole) to any other
          Person or Persons (other than the Company and/or any of
          its Subsidiaries in one or more transactions each of
          which complies with Section 11(o) hereof), if (x) at the
          time of or immediately after such consolidation, merger
          or sale there are any rights, warrants or other
          instruments or securities outstanding or agreements in
          effect which would substantially diminish or otherwise
          eliminate the benefits intended to be afforded by the
          Rights or (y) prior to, simultaneously with or
          immediately after such consolidation, merger or sale, the
          shareholders of the Person who constitutes, or would
          constitute, the "Principal Party" for purposes of Section
          13(a) hereof shall have received a distribution of Rights
          previously owned by such Person or any of its Affiliates
          and Associates. 

                         (o)  The Company covenants and agrees
          that, after the Distribution Date, it will not, except as
          permitted by Section 23 or Section 26 hereof, take (or
          permit any Subsidiary to take) any action if at the time
          such action is taken it is reasonably foreseeable that
          such action will diminish substantially or otherwise
          eliminate the benefits intended to be afforded by the
          Rights. 

                         (p)  Anything in this Agreement to the
          contrary notwithstanding, in the event that the Company
          shall at any time after the Rights Dividend Declaration
          Date and prior to the Distribution Date (i) declare a
          dividend on the outstanding shares of Common Stock
          payable in shares of Common Stock, (ii) subdivide the
          outstanding shares of Common Stock, or (iii) combine the
          outstanding shares of Common Stock into a smaller number
          of shares, the number of Rights associated with each
          share of Common Stock then outstanding, or issued or
          delivered thereafter but prior to the Distribution Date,
          shall be proportionately adjusted so that the number of
          Rights thereafter associated with each share of Common
          Stock following any such event shall equal the result
          obtained by multiplying the number of Rights associated
          with each share of Common Stock immediately prior to such
          event by a fraction the numerator of which shall be the
          total number of shares of Common Stock outstanding
          immediately prior to the occurrence of the event and the
          denominator of which shall be the total number of shares
          of Common Stock outstanding immediately following the
          occurrence of such event. 

                    Section 12.  Certificate of Adjusted Purchase
          Price or Number of Shares.  Whenever an adjustment is
          made as provided in Section 11 and Section 13 hereof, the
          Company shall (a) promptly prepare a certificate setting
          forth such adjustment and a brief statement of the facts
          accounting for such adjustment, (b) promptly file with
          the Rights Agent, and with each transfer agent for the
          Preferred Stock and the Common Stock, a copy of such
          certificate, and (c) mail or cause the Rights Agent to
          mail a brief summary thereof to each holder of a Rights
          Certificate (or, if prior to the Distribution Date, to
          each holder of a certificate representing shares of
          Common Stock) in accordance with Section 25 hereof.  The
          Rights Agent shall be fully protected in relying on any
          such certificate and on any adjustment therein contained.

                    Section 13.  Consolidation, Merger or Sale or
          Transfer of Assets or Earning Power. 

                         (a)  In the event that, following the
          Stock Acquisition Date, directly or indirectly, (x) the
          Company shall consolidate with, or merge with and into,
          any other Person (other than a Subsidiary of the Company
          in a transaction which complies with Section 11(o)
          hereof), and the Company shall not be the continuing or
          surviving corporation of such consolidation or merger,
          (y) any Person (other than a Subsidiary of the Company in
          a transaction which complies with Section 11(o) hereof)
          shall consolidate with, or merge with or into, the
          Company, and the Company shall be the continuing or
          surviving corporation of such consolidation or merger
          and, in connection with such consolidation or merger, all
          or part of the outstanding shares of Common Stock shall
          be changed into or exchanged for stock or other
          securities of any other Person or cash or any other
          property, or (z) the Company shall sell or otherwise
          transfer (or one or more of its Subsidiaries shall sell
          or otherwise transfer), in one transaction or a series of
          related transactions, assets or earning power aggregating
          more than 50% of the assets or earning power of the
          Company and its Subsidiaries (taken as a whole) to any
          Person or Persons (other than the Company or any
          Subsidiary of the Company in one or more transactions
          each of which complies with Section 11(o) hereof), then,
          and in each such case (except as may be contemplated by
          Section 13(d) hereof), proper provision shall be made so
          that:  (i) each holder of a Right, except as provided in
          Section 7(e) hereof, shall thereafter have the right to
          receive, upon the exercise thereof at the then current
          Purchase Price in accordance with the terms of this
          Agreement, such number of validly authorized and issued,
          fully paid, non-assessable and freely tradeable shares of
          Common Stock of the Principal Party (as such term is
          hereinafter defined), not subject to any liens,
          encumbrances, rights of first refusal or other adverse
          claims, as shall be equal to the result obtained by (1)
          multiplying the then current Purchase Price by the number
          of one one-thousandths of a share of Preferred Stock for
          which a Right is exercisable immediately prior to the
          first occurrence of a Section 13 Event (or, if a Section
          11(a)(ii) Event has occurred prior to the first
          occurrence of a Section 13 Event, multiplying the number
          of such one one-thousandths of a share for which a Right
          was exercisable immediately prior to the first occurrence
          of a Section 11(a)(ii) Event by the Purchase Price in
          effect immediately prior to such first occurrence), and
          dividing that product (which, following the first
          occurrence of a Section 13 Event, shall be referred to as
          the "Purchase Price" for each Right and for all purposes
          of this Agreement) by (2) 50% of the Current Market Price
          per share of the Common Stock of such Principal Party on
          the date of consummation of such Section 13 Event; (ii)
          such Principal Party shall thereafter be liable for, and
          shall assume, by virtue of such Section 13 Event, all the
          obligations and duties of the Company pursuant to this
          Agreement; (iii) the term "Company" shall thereafter be
          deemed to refer to such Principal Party, it being
          specifically intended that the provisions of Section 11
          hereof shall apply only to such Principal Party following
          the first occurrence of a Section 13 Event; (iv) such
          Principal Party shall take such steps (including, but not
          limited to, the reservation of a sufficient number of
          shares of its Common Stock) in connection with the
          consummation of any such transaction as may be necessary
          to assure that the provisions hereof shall thereafter be
          applicable, as nearly as reasonably may be, in relation
          to its shares of Common Stock thereafter deliverable upon
          the exercise of the Rights; and (v) the provisions of
          Section 11(a)(ii) hereof shall be of no effect following
          the first occurrence of any Section 13 Event. 

                         (b)  "Principal Party" shall mean 

                              (i)  in the case of any
               transaction described in clause (x) or (y) of
               the first sentence of Section 13(a), the Person
               that is the issuer of any securities into which
               shares of Common Stock of the Company are
               converted in such merger or consolidation, and
               if no securities are so issued, the Person that
               is the other party to such merger or
               consolidation; and  

                              (ii)  in the case of any
               transaction described in clause (z) of the
               first sentence of Section 13(a), the Person
               that is the party receiving the greatest
               portion of the assets or earning power
               transferred pursuant to such transaction or
               transactions; 

          provided, however, that in any such case, (1) if the
          Common Stock of such Person is not at such time and has
          not been continuously over the preceding twelve (12)
          month period registered under Section 12 of the Exchange
          Act, and such Person is a direct or indirect Subsidiary
          of another Person the Common Stock of which is and has
          been so registered, "Principal Party" shall refer to such
          other Person; and (2) in case such Person is a
          Subsidiary, directly or indirectly, of more than one
          Person, the Common Stocks of two or more of which are and
          have been so registered, "Principal Party" shall refer to
          whichever of such Persons is the issuer of the Common
          Stock having the greatest aggregate market value. 

                         (c)  The Company shall not consummate any
          such consolidation, merger, sale or transfer unless the
          Principal Party shall have a sufficient number of
          authorized shares of its Common Stock which have not been
          issued or reserved for issuance to permit the exercise in
          full of the Rights in accordance with this Section 13 and
          unless prior thereto the Company and such Principal Party
          shall have executed and delivered to the Rights Agent a
          supplemental agreement providing for the terms set forth
          in paragraphs (a) and (b) of this Section 13 and further
          providing that, as soon as practicable after the date of
          any consolidation, merger or sale of assets mentioned in
          paragraph (a) of this Section 13, the Principal Party
          will  

                              (i)  prepare and file a
               registration statement under the Act, with
               respect to the Rights and the securities
               purchasable upon exercise of the Rights on an
               appropriate form, and will use its best efforts
               to cause such registration statement to (A)
               become effective as soon as practicable after
               such filing and (B) remain effective (with a
               prospectus at all times meeting the
               requirements of the Act) until the Expiration
               Date; and 

                              (ii)  will deliver to holders of
               the Rights historical financial statements for
               the Principal Party and each of its Affiliates
               which comply in all respects with the
               requirements for registration on Form 10 under
               the Exchange Act. 

          The provisions of this Section 13 shall similarly apply
          to successive mergers or consolidations or sales or other
          transfers.  In the event that a Section 13 Event shall
          occur at any time after the occurrence of a Section
          11(a)(ii) Event, the Rights which have not theretofore
          been exercised shall thereafter become exercisable in the
          manner described in Section 13(a). 

                         (d)  Notwithstanding anything in this
          Agreement to the contrary, Section 13 shall not be
          applicable to a transaction described in subparagraphs
          (x) and (y) of Section 13(a) if (i) such transaction is
          consummated with a Person or Persons who acquired shares
          of Common Stock pursuant to a Qualifying Offer (or a
          wholly owned subsidiary of any such Person or Persons),
          (ii) the price per share of Common Stock offered in such
          transaction is not less than the price per share of
          Common Stock paid to all holders of shares of Common
          Stock whose shares were purchased pursuant to such tender
          offer or exchange offer and (iii) the form of
          consideration being offered to the remaining holders of
          shares of Common Stock pursuant to such transaction is
          the same as the form of consideration paid pursuant to
          such tender offer or exchange offer.  Upon consummation
          of any such transaction contemplated by this Section
          13(d), all Rights hereunder shall expire. 

                    Section 14.  Fractional Rights and Fractional
          Shares. 

                         (a)  The Company shall not be required to
          issue fractions of Rights, except prior to the
          Distribution Date as provided in Section 11(p) hereof, or
          to distribute Rights Certificates which evidence
          fractional Rights.  In lieu of such fractional Rights,
          there shall be paid to the registered holders of the
          Rights Certificates with regard to which such fractional
          Rights would otherwise be issuable, an amount in cash
          equal to the same fraction of the current market value of
          a whole Right.  For purposes of this Section 14(a), the
          current market value of a whole Right shall be the
          closing price of the Rights for the Trading Day
          immediately prior to the date on which such fractional
          Rights would have been otherwise issuable.  The closing
          price of the Rights for any day shall be the last sale
          price, regular way, or, in case no such sale takes place
          on such day, the average of the closing bid and asked
          prices, regular way, in either case as reported in the
          principal consolidated transaction reporting system with
          respect to securities listed or admitted to trading on
          the New York Stock Exchange or, if the Rights are not
          listed or admitted to trading on the New York Stock
          Exchange, as reported in the principal consolidated
          transaction reporting system with respect to securities
          listed on the principal national securities exchange on
          which the Rights are listed or admitted to trading, or if
          the Rights are not listed or admitted to trading on any
          national securities exchange, the last quoted price or,
          if not so quoted, the average of the high bid and low
          asked prices in the over-the-counter market, as reported
          by NASDAQ or such other system then in use or, if on any
          such date the Rights are not quoted by any such
          organization, the average of the closing bid and asked
          prices as furnished by a professional market maker making
          a market in the Rights selected by the Board of Directors
          of the Company.  If on any such date no such market maker
          is making a market in the Rights the fair value of the
          Rights on such date as determined in good faith by the
          Board of Directors of the Company shall be used. 

                         (b)  The Company shall not be required to
          issue fractions of shares of Preferred Stock (other than
          fractions which are integral multiples of one
          one-thousandth of a share of Preferred Stock) upon
          exercise of the Rights or to distribute certificates
          which evidence fractional shares of Preferred Stock
          (other than fractions which are integral multiples of one
          one-thousandth of a share of Preferred Stock).  In lieu
          of fractional shares of Preferred Stock that are not
          integral multiples of one one-thousandth of a share of
          Preferred Stock, the Company may pay to the registered
          holders of Rights Certificates at the time such Rights
          are exercised as herein provided an amount in cash equal
          to the same fraction of the current market value of one
          one-thousandth of a share of Preferred Stock.  For
          purposes of this Section 14(b), the current market value
          of one one-thousandth of a share of Preferred Stock shall
          be one one-thousandth of the closing price of a share of
          Preferred Stock (as determined pursuant to Section
          11(d)(ii) hereof) for the Trading Day immediately prior
          to the date of such exercise. 

                         (c)  Following the occurrence of a
          Triggering Event, the Company shall not be required to
          issue fractions of Common Shares upon exercise of the
          Rights or to distribute certificates which evidence
          fractional Common Shares.  In lieu of fractional Common
          Shares, the Company may pay to the registered holders of
          Rights Certificates at the time such Rights are exercised
          as herein provided an amount in cash equal to the same
          fraction of the current market value of one (1) Common
          Share.  For purposes of this Section 14(c), the current
          market value of one Common Share shall be the closing
          price of one Common Share (as determined pursuant to
          Section 11(d)(i) hereof) for the Trading Day immediately
          prior to the date of such exercise. 

                         (d)  The holder of a Right by the
          acceptance of the Rights expressly waives his or her
          right to receive any fractional Rights or any fractional
          shares upon exercise of a Right, except as permitted by
          this Section 14. 

                    Section 15.  Rights of Action.  All rights of
          action in respect of this Agreement are vested in the
          respective registered holders of the Rights Certificates
          (and, prior to the Distribution Date, the registered
          holders of the Common Stock); and any registered holder
          of any Rights Certificate (or, prior to the Distribution
          Date, of the Common Stock), without the consent of the
          Rights Agent or of the holder of any other Rights
          Certificate (or, prior to the Distribution Date, of the
          Common Stock), may, in his or her own behalf and for his
          or her own benefit, enforce, and may institute and
          maintain any suit, action or proceeding against the
          Company to enforce, or otherwise act in respect of, his
          or her right to exercise the Rights evidenced by such
          Rights Certificate in the manner provided in such Rights
          Certificate and in this Agreement.  Without limiting the
          foregoing or any remedies available to the holders of
          Rights, it is specifically acknowledged that the holders
          of Rights would not have an adequate remedy at law for
          any breach of this Agreement and shall be entitled to
          specific performance of the obligations hereunder and
          injunctive relief against actual or threatened violations
          of the obligations hereunder of any Person subject to
          this Agreement. 

                    Section 16.  Agreement of Rights Holders. 
          Every holder of a Right by accepting the same consents
          and agrees with the Company and the Rights Agent and with
          every other holder of a Right that: 

                         (a)  prior to the Distribution Date, the
          Rights will be transferable only in connection with the
          transfer of Common Stock; 

                         (b)  after the Distribution Date, the
          Rights Certificates are transferable only on the registry
          books of the Rights Agent if surrendered at the principal
          office or offices of the Rights Agent designated for such
          purposes, duly endorsed or accompanied by a proper
          instrument of transfer and with the appropriate forms and
          certificates fully executed;  

                         (c)  subject to Section 6(a) and Section
          7(f) hereof, the Company and the Rights Agent may deem
          and treat the person in whose name a Rights Certificate
          (or, prior to the Distribution Date, the associated
          Common Stock certificate) is registered as the absolute
          owner thereof and of the Rights evidenced thereby
          (notwithstanding any notations of ownership or writing on
          the Rights Certificates or the associated Common Stock
          certificate made by anyone other than the Company or the
          Rights Agent) for all purposes whatsoever, and neither
          the Company nor the Rights Agent, subject to the last
          sentence of Section 7(e) hereof, shall be required to be
          affected by any notice to the contrary; and  

                         (d)  notwithstanding anything in this
          Agreement to the contrary, neither the Company nor the
          Rights Agent shall have any liability to any holder of a
          Right or other Person as a result of its inability to
          perform any of its obligations under this Agreement by
          reason of any preliminary or permanent injunction or
          other order, decree or ruling issued by a court of
          competent jurisdiction or by a governmental, regulatory
          or administrative agency or commission, or any statute,
          rule, regulation or executive order promulgated or
          enacted by any governmental authority, prohibiting or
          otherwise restraining performance of such obligation;
          provided, however, the Company must use its best efforts
          to have any such order, decree or ruling lifted or
          otherwise overturned as soon as possible. 

                    Section 17.  Rights Certificate Holder Not
          Deemed a Shareholder.  No holder, as such, of any Rights
          Certificate shall be entitled to vote, receive dividends
          or be deemed for any purpose the holder of the number of
          one one-thousandths of a share of Preferred Stock or any
          other securities of the Company which may at any time be
          issuable on the exercise of the Rights represented
          thereby, nor shall anything contained herein or in any
          Rights Certificate be construed to confer upon the holder
          of any Rights Certificate, as such, any of the rights of
          a shareholder of the Company or any right to vote for the
          election of directors or upon any matter submitted to
          shareholders at any meeting thereof, or to give or
          withhold consent to any corporate action, or to receive
          notice of meetings or other actions affecting
          shareholders (except as provided in Section 24 hereof),
          or to receive dividends or subscription rights, or
          otherwise, until the Right or Rights evidenced by such
          Rights Certificate shall have been exercised in
          accordance with the provisions hereof. 

                    Section 18.  Concerning the Rights Agent. 

                         (a)  The Company agrees to pay to the
          Rights Agent reasonable compensation for all services
          rendered by it hereunder and, from time to time, on
          demand of the Rights Agent, its reasonable expenses and
          counsel fees and disbursements and other disbursements
          incurred in the administration and execution of this
          Agreement and the exercise and performance of its duties
          hereunder.  The Company also agrees to indemnify the
          Rights Agent for, and to hold it harmless against, any
          loss, liability, or expense, incurred without negligence,
          bad faith or willful misconduct on the part of the Rights
          Agent, for anything done or omitted by the Rights Agent
          in connection with the acceptance and administration of
          this Agreement, including reasonable attorneys' fees and
          expenses and the costs and expenses of defending against
          any claim of liability in the premises.  In no case will
          the Rights Agent be liable for special, indirect,
          incidental or consequential loss or damage of any kind
          whatsoever (including but not limited to lost profits),
          even if the Rights Agent has been advised of the
          possibility of such damages.  Any liability of the Rights
          Agent will be limited to the amount of fees paid by the
          Company hereunder.  This Section 18(a) shall survive the
          termination of this Agreement.

                         (b)  The Rights Agent shall be protected
          and shall incur no liability for or in respect of any
          action taken, suffered or omitted by it in connection
          with its administration of this Agreement in reliance
          upon any Rights Certificate or certificate for Common
          Stock or for other securities of the Company, instrument
          of assignment or transfer, power of attorney,
          endorsement, affidavit, letter, notice, direction,
          consent, certificate, statement, or other paper or
          document believed by it to be genuine and to be signed,
          executed and, where necessary, verified or acknowledged,
          by the proper Person or Persons.

                    Section 19.  Merger or Consolidation or Change
          of Name of Rights Agent.

                         (a)  Any corporation into which the Rights
          Agent or any successor Rights Agent may be merged or with
          which it may be consolidated, or any corporation
          resulting from any merger or consolidation to which the
          Rights Agent or any successor Rights Agent shall be a
          party, or any corporation succeeding to the corporate
          trust or shareholder services business of the Rights
          Agent or any successor Rights Agent, shall be the
          successor to the Rights Agent under this Agreement
          without the execution or filing of any paper or any
          further act on the part of any of the parties hereto;
          provided, however, that such corporation would be
          eligible for appointment as a successor Rights Agent
          under the provisions of Section 21 hereof.  In case at
          the time such successor Rights Agent shall succeed to the
          agency created by this Agreement, any of the Rights
          Certificates shall have been countersigned but not
          delivered, any such successor Rights Agent may adopt the
          countersignature of a predecessor Rights Agent and
          deliver such Rights Certificates so countersigned; and in
          case at that time any of the Rights Certificates shall
          not have been countersigned, any successor Rights Agent
          may countersign such Rights Certificates either in the
          name of the predecessor or in the name of the successor
          Rights Agent; and in all such cases such Rights
          Certificates shall have the full force provided in the
          Rights Certificates and in this Agreement. 

                         (b)  In case at any time the name of the
          Rights Agent shall be changed and at such time any of the
          Rights Certificates shall have been countersigned but not
          delivered, the Rights Agent may adopt the
          countersignature under its prior name and deliver Rights
          Certificates so countersigned; and in case at that time
          any of the Rights Certificates shall not have been
          countersigned, the Rights Agent may countersign such
          Rights Certificates either in its prior name or in its
          changed name; and in all such cases such Rights
          Certificates shall have the full force provided in the
          Rights Certificates and in this Agreement. 

                    Section 20.  Duties of Rights Agent.  The
          Rights Agent undertakes the duties and obligations
          imposed by this Agreement upon the following terms and
          conditions, by all of which the Company and the holders
          of Rights Certificates, by their acceptance thereof,
          shall be bound: 

                         (a)  The Rights Agent may consult with
          legal counsel (who may be legal counsel for the Company),
          and the opinion of such counsel shall be full and
          complete authorization and protection to the Rights Agent
          as to any action taken or omitted by it in good faith and
          in accordance with such opinion. 

                         (b)  Whenever in the performance of its
          duties under this Agreement the Rights Agent shall deem
          it necessary or desirable that any fact or matter
          (including, without limitation, the identity of any
          Acquiring Person and the determination of "current market
          price") be proved or established by the Company prior to
          taking or suffering any action hereunder, such fact or
          matter (unless other evidence in respect thereof be
          herein specifically prescribed) may be deemed to be
          conclusively proved and established by a certificate
          signed by the Chairman of the Board, the President, any
          Vice President, the Treasurer, any Assistant Treasurer,
          the Secretary or any Assistant Secretary of the Company
          and delivered to the Rights Agent; and such certificate
          shall be full authorization to the Rights Agent for any
          action taken or suffered in good faith by it under the
          provisions of this Agreement in reliance upon such
          certificate. 

                         (c)  The Rights Agent shall be liable
          hereunder only for its own negligence, bad faith or
          willful misconduct. 

                         (d)  The Rights Agent shall not be liable
          for or by reason of any of the statements of fact or
          recitals contained in this Agreement or in the Rights
          Certificates or be required to verify the same (except as
          to its countersignature on such Rights Certificates), but
          all such statements and recitals are and shall be deemed
          to have been made by the Company only.

                         (e)  The Rights Agent shall not be under
          any responsibility in respect of the validity of this
          Agreement or the execution and delivery hereof (except
          the due execution hereof by the Rights Agent) or in
          respect of the validity or execution of any Rights
          Certificate (except its countersignature thereof); nor
          shall it be responsible for any breach by the Company of
          any covenant or condition contained in this Agreement or
          in any Rights Certificate; nor shall it be responsible
          for any adjustment required under the provisions of
          Section 11 or Section 13 hereof or responsible for the
          manner, method or amount of any such adjustment or the
          ascertaining of the existence of facts that would require
          any such adjustment (except with respect to the exercise
          of Rights evidenced by Rights Certificates after actual
          notice of any such adjustment); nor shall it by any act
          hereunder be deemed to make any representation or
          warranty as to the authorization or reservation of any
          shares of Common Stock or Preferred Stock to be issued
          pursuant to this Agreement or any Rights Certificate or
          as to whether any shares of Common Stock or Preferred
          Stock will, when so issued, be validly authorized and
          issued, fully paid and nonassessable.

                         (f)  The Company agrees that it will
          perform, execute, acknowledge and deliver or cause to be
          performed, executed, acknowledged and delivered all such
          further and other acts, instruments and assurances as may
          reasonably be required by the Rights Agent for the
          carrying out or performing by the Rights Agent of the
          provisions of this Agreement.

                         (g)  The Rights Agent is hereby authorized
          and directed to accept instructions with respect to the
          performance of its duties hereunder from the Chairman of
          the Board, the President, any Vice President, the
          Secretary, any Assistant Secretary, the Treasurer or any
          Assistant Treasurer of the Company, and to apply to such
          officers for advice or instructions in connection with
          its duties, and it shall not be liable for any action
          taken or suffered to be taken by it in good faith in
          accordance with instructions of any such officer. 

                         (h)  The Rights Agent and any shareholder,
          director, officer or employee of the Rights Agent may
          buy, sell or deal in any of the Rights or other
          securities of the Company or become pecuniarily
          interested in any transaction in which the Company may be
          interested, or contract with or lend money to the Company
          or otherwise act as fully and freely as though it were
          not Rights Agent under this Agreement.  Nothing herein
          shall preclude the Rights Agent from acting in any other
          capacity for the Company or for any other legal entity. 

                         (i)  The Rights Agent may execute and
          exercise any of the rights or powers hereby vested in it
          or perform any duty hereunder either itself or by or
          through its attorneys or agents, and the Rights Agent
          shall not be answerable or accountable for any act,
          default, neglect or misconduct of any such attorneys or
          agents or for any loss to the Company resulting from any
          such act, default, neglect or misconduct; provided,
          however, reasonable care was exercised in the selection
          and continued employment thereof. 

                         (j)  No provision of this Agreement shall
          require the Rights Agent to expend or risk its own funds
          or otherwise incur any financial liability in the
          performance of any of its duties hereunder or in the
          exercise of its rights if there shall be reasonable
          grounds for believing that repayment of such funds or
          adequate indemnification against such risk or liability
          is not reasonably assured to it. 

                         (k)  If, with respect to any Right
          Certificate surrendered to the Rights Agent for exercise
          or transfer, the certificate attached to the form of
          assignment or form of election to purchase, as the case
          may be, has either not been completed or indicates an
          affirmative response to clause 1 and/or 2 thereof, the
          Rights Agent shall not take any further action with
          respect to such requested exercise of transfer without
          first consulting with the Company. 

                    Section 21.  Change of Rights Agent.  The
          Rights Agent or any successor Rights Agent may resign and
          be discharged from its duties under this Agreement upon
          thirty (30) days' notice in writing mailed to the
          Company, and to each transfer agent of the Common Stock
          and Preferred Stock, by registered or certified mail, and
          to the holders of the Rights Certificates by first-class
          mail.  The Company may remove the Rights Agent or any
          successor Rights Agent upon thirty (30) days' notice in
          writing, mailed to the Rights Agent or successor Rights
          Agent, as the case may be, and to each transfer agent of
          the Common Stock and Preferred Stock, by registered or
          certified mail, and to the holders of the Rights
          Certificates by first-class mail.  If the Rights Agent
          shall resign or be removed or shall otherwise become
          incapable of acting, the Company shall appoint a
          successor to the Rights Agent.  If the Company shall fail
          to make such appointment within a period of thirty (30)
          days after giving notice of such removal or after it has
          been notified in writing of such resignation or
          incapacity by the resigning or incapacitated Rights Agent
          or by the holder of a Rights Certificate (who shall, with
          such notice, submit his Rights Certificate for inspection
          by the Company), then any registered holder of any Rights
          Certificate may apply to any court of competent
          jurisdiction for the appointment of a new Rights Agent. 
          Any successor Rights Agent, whether appointed by the
          Company or by such a court, shall be a corporation or any
          affiliate of such a corporation organized and doing
          business under the laws of the United States or of the
          State of New York (or of any other state of the United
          States so long as such corporation is authorized to do
          business as a banking institution in the State of New
          York), in good standing, which is authorized under such
          laws to exercise corporate trust powers and is subject to
          supervision or examination by federal or state authority
          and which has at the time of its appointment as Rights
          Agent a combined capital and surplus of at least
          $100,000,000.  After appointment, the successor Rights
          Agent shall be vested with the same powers, rights,
          duties and responsibilities as if it had been originally
          named as Rights Agent without further act or deed; but
          the predecessor Rights Agent shall deliver and transfer
          to the successor Rights Agent any property at the time
          held by it hereunder, and execute and deliver any further
          assurance, conveyance, act or deed necessary for the
          purpose.  Not later than the effective date of any such
          appointment, the Company shall file notice thereof in
          writing with the predecessor Rights Agent and each
          transfer agent of the Common Stock and the Preferred
          Stock, and mail a notice thereof in writing to the
          registered holders of the Rights Certificates.  Failure
          to give any notice provided for in this Section 21,
          however, or any defect therein, shall not affect the
          legality or validity of the resignation or removal of the
          Rights Agent or the appointment of the successor Rights
          Agent, as the case may be. 

                    Section 22.  Issuance of New Rights
          Certificates.  Notwithstanding any of the provisions of
          this Agreement or of the Rights to the contrary, the
          Company may, at its option, issue new Rights Certificates
          evidencing Rights in such form as may be approved by its
          Board of Directors to reflect any adjustment or change in
          the Purchase Price and the number or kind or class of
          shares or other securities or property purchasable under
          the Rights Certificates made in accordance with the
          provisions of this Agreement.  In addition, in connection
          with the issuance or sale of shares of Common Stock
          following the Distribution Date and prior to the
          redemption or expiration of the Rights, the Company (a)
          shall, with respect to shares of Common Stock so issued
          or sold pursuant to the exercise of stock options or
          under any employee plan or arrangement, granted or
          awarded as of the Distribution Date, or upon the
          exercise, conversion or exchange of securities
          hereinafter issued by the Company, and (b) may, in any
          other case, if deemed necessary or appropriate by the
          Board of Directors of the Company, issue Rights
          Certificates representing the appropriate number of
          Rights in connection with such issuance or sale;
          provided, however, that (i) no such Rights Certificate
          shall be issued if, and to the extent that, the Company
          shall be advised by counsel that such issuance would
          create a significant risk of material adverse tax
          consequences to the Company or the Person to whom such
          Rights Certificate would be issued, and (ii) no such
          Rights Certificate shall be issued if, and to the extent
          that, appropriate adjustment shall otherwise have been
          made in lieu of the issuance thereof. 

                    Section 23.  Redemption and Termination.

                         (a)  The Board of Directors of the Company
          may, at its option, at any time prior to the earlier of
          (i) the close of business on the tenth day following the
          Stock Acquisition Date (or, if the Stock Acquisition Date
          shall have occurred prior to the Record Date, the close
          of business on the tenth day following the Record Date),
          or (ii) the Final Expiration Date, redeem all but not
          less than all the then outstanding Rights at a redemption
          price of $0.01 per Right, as such amount may be
          appropriately adjusted to reflect any stock split, stock
          dividend or similar transaction occurring after the date
          hereof (such redemption price being hereinafter referred
          to as the "Redemption Price").  Notwithstanding anything
          contained in this Agreement to the contrary, the Rights
          shall not be exercisable after the first occurrence of a
          Section 11(a)(ii) Event until such time as the Company's
          right of redemption hereunder has expired.  The Company
          may, at its option, pay the Redemption Price in cash,
          shares of Common Stock (based on the "current market
          price", as defined in Section 11(d)(i) hereof, of the
          Common Stock at the time of redemption) or any other form
          of consideration deemed appropriate by the Board of
          Directors. 

                         (b)  Immediately upon the action of the
          Board of Directors of the Company ordering the redemption
          of the Rights, evidence of which shall have been filed
          with the Rights Agent and without any further action and
          without any notice, the right to exercise the Rights will
          terminate and the only right thereafter of the holders of
          Rights shall be to receive the Redemption Price for each
          Right so held.  Promptly after the action of the Board of
          Directors ordering the redemption of the Rights, the
          Company shall give notice of such redemption to the
          Rights Agent and the holders of the then outstanding
          Rights by mailing such notice to all such holders at each
          holder's last address as it appears upon the registry
          books of the Rights Agent or, prior to the Distribution
          Date, on the registry books of the transfer agent for the
          Common Stock.  Any notice which is mailed in the manner
          herein provided shall be deemed given, whether or not the
          holder receives the notice.  Each such notice of
          redemption will state the method by which the payment of
          the Redemption Price will be made.

                    Section 24.  Notice of Certain Events.  

                         (a)  In case the Company shall propose, at
          any time after the Distribution Date, (i) to pay any
          dividend payable in stock of any class to the holders of
          Preferred Stock or to make any other distribution to the
          holders of Preferred Stock (other than a regular
          quarterly cash dividend out of earnings or retained
          earnings of the Company), or (ii) to offer to the holders
          of Preferred Stock rights or warrants to subscribe for or
          to purchase any additional shares of Preferred Stock or
          shares of stock of any class or any other securities,
          rights or options, or (iii) to effect any
          reclassification of its Preferred Stock (other than a
          reclassification involving only the subdivision of
          outstanding shares of Preferred Stock), or (iv) to effect
          any consolidation or merger into or with any other Person
          (other than a Subsidiary of the Company in a transaction
          which complies with Section 11(o) hereof), or to effect
          any sale or other transfer (or to permit one or more of
          its Subsidiaries to effect any sale or other transfer),
          in one transaction or a series of related transactions,
          of more than 50% of the assets or earning power of the
          Company and its Subsidiaries (taken as a whole) to any
          other Person or Persons (other than the Company and/or
          any of its Subsidiaries in one or more transactions each
          of which complies with Section 11(o) hereof), or (v) to
          effect the liquidation, dissolution or winding up of the
          Company, then, in each such case, the Company shall give
          to each holder of a Rights Certificate, to the extent
          feasible and in accordance with Section 25 hereof, a
          notice of such proposed action, which shall specify the
          record date for the purposes of such stock dividend,
          distribution of rights or warrants, or the date on which
          such reclassification, consolidation, merger, sale,
          transfer, liquidation, dissolution, or winding up is to
          take place and the date of participation therein by the
          holders of the shares of Preferred Stock, if any such
          date is to be fixed, and such notice shall be so given in
          the case of any action covered by clause (i) or (ii)
          above at least twenty (20) days prior to the record date
          for determining holders of the shares of Preferred Stock
          for purposes of such action, and in the case of any such
          other action, at least twenty (20) days prior to the date
          of the taking of such proposed action or the date of
          participation therein by the holders of the shares of
          Preferred Stock whichever shall be the earlier. 

                         (b)  In case any of the events set forth
          in Section 11(a)(ii) hereof shall occur, then, in any
          such case, (i) the Company shall as soon as practicable
          thereafter give to each holder of a Rights Certificate,
          to the extent feasible and in accordance with Section 25
          hereof, a notice of the occurrence of such event, which
          shall specify the event and the consequences of the event
          to holders of Rights under Section 11(a)(ii) hereof, and
          (ii) all references in the preceding paragraph to
          Preferred Stock shall be deemed thereafter to refer to
          Common Stock and/or, if appropriate, other securities. 

                    Section 25.  Notices.  Notices or demands
          authorized by this Agreement to be given or made by the
          Rights Agent or by the holder of any Rights Certificate
          to or on the Company shall be sufficiently given or made
          if sent by first-class mail, postage prepaid,
          addressed(until another address is filed in writing with
          the Rights Agent) as follows:

                              Regeneron Pharmaceuticals, Inc.
                              777 Old Saw Mill River Road
                              Tarrytown, New York 10591
                              Attention:  General Counsel

          Subject to the provisions of Section 21, any notice or
          demand authorized by this Agreement to be given or made
          by the Company or by the holder of any Rights Certificate
          to or on the Rights Agent shall be sufficiently given or
          made if sent by first-class mail, postage prepaid,
          addressed (until another address is filed in writing with
          the Company) as follows:

                          ChaseMellon Shareholder Services L.L.C.
                          450 West 33rd Street - 15th Floor
                          New York, New York  10001-2697
                          Attention:  Stock Transfer Administration

          Notices or demands authorized by this Agreement to be
          given or made by the Company or the Rights Agent to the
          holder of any Rights Certificate (or, if prior to the
          Distribution Date, to the holder of certificates
          representing shares of Common Stock) shall be
          sufficiently given or made if sent by first-class mail,
          postage prepaid, addressed to such holder at the address
          of such holder as shown on the registry books of the
          Company. 

                    Section 26.  Supplements and Amendments.  Prior
          to the Distribution Date and subject to the penultimate
          sentence of this Section 26, the Company and the Rights
          Agent shall, if the Company so directs, supplement or
          amend any provision of this Agreement without the
          approval of any holders of certificates representing
          shares of Common Stock.  From and after the Distribution
          Date and subject to the penultimate sentence of this
          Section 26, the Company and the Rights Agent shall, if
          the Company so directs, supplement or amend this
          Agreement without the approval of any holders of Rights
          Certificates in order (i) to cure any ambiguity, (ii) to
          correct or supplement any provision contained herein
          which may be defective or inconsistent with any other
          provisions herein, (iii) to shorten or lengthen any time
          period hereunder, or (iv) to change or supplement the
          provisions hereunder in any manner which the Company may
          deem necessary or desirable and which shall not adversely
          affect the interests of the holders of Rights
          Certificates (other than an Acquiring Person or an
          Affiliate or Associate of an Acquiring Person); provided,
          this Agreement may not be supplemented or amended to
          lengthen, pursuant to clause (iii) of this sentence, (A)
          a time period relating to when the Rights may be redeemed
          at such time as the Rights are not then redeemable, or
          (B) any other time period unless such lengthening is for
          the purpose of protecting, enhancing or clarifying the
          rights of, and/or the benefits to, the holders of Rights. 
          Upon the delivery of a certificate from an appropriate
          officer of the Company which states that the proposed
          supplement or amendment is in compliance with the terms
          of this Section 26, the Rights Agent shall execute such
          supplement or amendment.  Notwithstanding anything
          contained in this Agreement to the contrary, no
          supplement or amendment shall be made which changes the
          Redemption Price, the Final Expiration Date, the Purchase
          Price or the number of one one-thousandths of a share of
          Preferred Stock for which a Right is exercisable.  Prior
          to the Distribution Date, the interests of the holders of
          Rights shall be deemed coincident with the interests of
          the holders of Common Stock. 

                    Section 27.  Successors.  All the covenants and
          provisions of this Agreement by or for the benefit of the
          Company or the Rights Agent shall bind and inure to the
          benefit of their respective successors and assigns
          hereunder. 

                    Section 28.  Determinations and Actions by the
          Board of Directors, etc.  For all purposes of this
          Agreement, any calculation of the number of shares of
          Common Stock outstanding at any particular time,
          including for purposes of determining the particular
          percentage of such outstanding shares of Common Stock of
          which any Person is the Beneficial Owner, shall be made
          in accordance with the last sentence of Rule
          13d-3(d)(1)(i) of the General Rules and Regulations under
          the Exchange Act.  The Board of Directors of the Company
          shall have the exclusive power and authority to
          administer this Agreement and to exercise all rights and
          powers specifically granted to the Board or to the
          Company, or as may be necessary or advisable in the
          administration of this Agreement, including, without
          limitation, the right and power to (i) interpret the
          provisions of this Agreement, and (ii) make all
          determinations deemed necessary or advisable for the
          administration of this Agreement (including a
          determination to redeem or not redeem the Rights or to
          amend the Agreement).  All such actions, calculations,
          interpretations and determinations (including, for
          purposes of clause (y) below, all omissions with respect
          to the foregoing) which are done or made by the Board in
          good faith, shall (x) be final, conclusive and binding on
          the Company, the Rights Agent, the holders of the Rights
          and all other parties, and (y) not subject the Board to
          any liability to the holders of the Rights. 

                    Section 29.  Benefits of this Agreement. 
          Nothing in this Agreement shall be construed to give to
          any Person other than the Company, the Rights Agent and
          the registered holders of the Rights Certificates (and,
          prior to the Distribution Date, registered holders of the
          Common Stock) any legal or equitable right, remedy or
          claim under this Agreement; but this Agreement shall be
          for the sole and exclusive benefit of the Company, the
          Rights Agent and the registered holders of the Rights
          Certificates (and, prior to the Distribution Date,
          registered holders of the Common Stock).

                    Section 30.  Severability.  If any term,
          provision, covenant or restriction of this Agreement is
          held by a court of competent jurisdiction or other
          authority to be invalid, void or unenforceable, the
          remainder of the terms, provisions, covenants and
          restrictions of this Agreement shall remain in full force
          and effect and shall in no way be affected, impaired or
          invalidated; provided, however, that notwithstanding
          anything in this Agreement to the contrary, if any such
          term, provision, covenant or restriction is held by such
          court or authority to be invalid, void or unenforceable
          and the Board of Directors of the Company determines in
          its good faith judgment that severing the invalid
          language from this Agreement would adversely affect the
          purpose or effect of this Agreement, the right of
          redemption set forth in Section 23 hereof shall be
          reinstated and shall not expire until the close of
          business on the tenth day following the date of such
          determination by the Board of Directors.

                    Section 31.  Governing Law.  This Agreement,
          each Right and each Rights Certificate issued hereunder
          shall be deemed to be a contract made under the laws of
          the State of New York and for all purposes shall be
          governed by and construed in accordance with the laws of
          such State applicable to contracts made and to be
          performed entirely within such State.

                    Section 32.  Counterparts.  This Agreement may
          be executed in any number of counterparts and each of
          such counterparts shall for all purposes be deemed to be
          an original, and all such counterparts shall together
          constitute but one and the same instrument. 

                    Section 33.  Descriptive Headings.  Descriptive
          headings of the several Sections of this Agreement are
          inserted for convenience only and shall not control or
          affect the meaning or construction of any of the
          provisions hereof. 

                    IN WITNESS WHEREOF, the parties hereto have
          caused this Agreement to be duly executed and their
          respective corporate seals to be hereunto affixed and
          attested, all as of the day and year first above written.

          Attest:                      REGENERON PHARMACEUTICALS, INC.

          By   /s/ Gail Kempler        By /s/ Paul Lubetkin           
          Name:  Gail Kempler          Name:  Paul Lubetkin
          Title: Vice President,       Title: Vice President 
                 Intellectual Property        & Secretary
                 & Associate General 
                 Counsel
                     

          Attest:                      CHASEMELLON SHAREHOLDER SERVIC 
                                       ES L.L.C.

          By   /s/ Nathan Hill         By /s/Leslie A DeLuca          
          Name:  Nathan Hill           Name:  Leslie A. DeLuca
          Title: Assistant             Title: Vice President
                 Vice President



                                                          Exhibit A

                       CERTIFICATE OF AMENDMENT OF THE
                    RESTATED CERTIFICATE OF INCORPORATION

                                      of

                       REGENERON PHARMACEUTICALS, INC.

              Under Section 805 of the Business Corporation Law
                           of the State of New York
           
           
                    We the undersigned, Leonard S. Schleifer,
          President, and Paul Lubetkin, Secretary of Regeneron
          Pharmaceuticals, Inc., a corporation organized and
          existing under the laws of the State of New York, in
          accordance with the provisions of Section 104 of the
          Business Corporation Law of the State of New York, DO
          HEREBY CERTIFY:

                    1.  The name of the corporation is Regeneron
          Pharmaceuticals, Inc. (hereinafter called the
          "Corporation").

                    2.  The Certificate of Incorporation was filed
          with the Department of State of the State of New York on
          January 11, 1988.

                    3.  The Certificate of Incorporation of the
          Company, as amended heretofore (the "Restated Certificate
          of Incorporation"), is further amended by the addition of
          the following provisions stating the number, designation,
          relative rights, preferences and limitations of a series
          of Preferred Shares of the Company designated as "Series
          A Junior Participating Preferred Stock."

                    4.  To accomplish the foregoing amendment, a
          new Article IX is added to the Restated Certificate of
          Incorporation, which Article IX reads in its entirety as
          follows:

                    Section 1.  Designation and Amount.  The shares
          of such series shall be designated as "Series A Junior
          Participating Preferred Stock" and the number of shares
          constituting such series shall be 25,000.
           
                    Section 2.  Dividends and Distributions.
           
                    (A)  The holders of shares of Series A Junior
          Participating Preferred Stock shall be entitled to
          receive, when, as and if declared by the Board of
          Directors out of funds legally available for the purpose,
          quarterly dividends payable in cash on the last day of
          March, June, September and December in each year (each
          such date being referred to herein as a "Quarterly
          Dividend Payment Date"), commencing on the first
          Quarterly Dividend Payment Date after the first issuance
          of a share or fraction of a share of Series A Junior
          Participating Preferred Stock, in an amount per share
          (rounded to the nearest cent) equal to the greater of (a)
          $0.01 or (b) subject to the provision for adjustment
          hereinafter set forth, 1,000 times the aggregate per
          share amount of all cash dividends, and 1,000 times the
          aggregate per share amount (payable in kind) of all
          non-cash dividends or other distributions other than a
          dividend payable in Common Shares or a subdivision of the
          outstanding Common Shares (by reclassification or
          otherwise), declared on the Common Shares since the
          immediately preceding Quarterly Dividend Payment Date,
          or, with respect to the first Quarterly Dividend Payment
          Date, since the first issuance of any share or fraction
          of a share of Series A Junior Participating Preferred
          Stock.  In the event the Corporation shall at any time
          after October 18, 1996 (the "Rights Declaration Date")
          (i) declare any dividend on Common Shares payable in
          Common Shares, (ii) subdivide the outstanding Common
          Shares, or (iii) combine the outstanding Common Shares
          into a smaller number of shares, then in each such case
          the amount to which holders of shares of Series A Junior
          Participating Preferred Stock were entitled immediately
          prior to such event under clause (b) of the preceding
          sentence shall be adjusted by multiplying such amount by
          a fraction the numerator of which is the number of Common
          Shares outstanding immediately after such event and the
          denominator of which is the number of Common Shares that
          were outstanding immediately prior to such event.

                    (B)  The Corporation shall declare a dividend
          or distribution on the Series A Junior Participating
          Preferred Stock as provided in Paragraph (A) above
          immediately after it declares a dividend or distribution
          on the Common Shares (other than a dividend payable in
          Common Shares); provided that, in the event no dividend
          or distribution shall have been declared on the Common
          Shares during the period between any Quarterly Dividend
          Payment Date and the next subsequent Quarterly Dividend
          Payment Date, a dividend of $0.01 per share on the Series
          A Junior Participating Preferred Stock shall nevertheless
          be payable on such subsequent Quarterly Dividend Payment
          Date.

                    (C)  Dividends shall begin to accrue and be
          cumulative on outstanding shares of Series A Junior
          Participating Preferred Stock from the Quarterly Dividend
          Payment Date next preceding the date of issue of such
          shares of Series A Junior Participating Preferred Stock,
          unless the date of issue of such shares is prior to the
          record date for the first Quarterly Dividend Payment
          Date, in which case dividends on such shares shall begin
          to accrue from the date of issue of such shares, or
          unless the date of issue is a Quarterly Dividend Payment
          Date or is a date after the record date for the
          determination of holders of shares of Series A Junior
          Participating Preferred Stock entitled to receive a
          quarterly dividend and before such Quarterly Dividend
          Payment Date, in either of which events such dividends
          shall begin to accrue and be cumulative from such
          Quarterly Dividend Payment Date.  Accrued but unpaid
          dividends shall not bear interest.  Dividends paid on the
          shares of Series A Junior Participating Preferred Stock
          in an amount less than the total amount of such dividends
          at the time accrued and payable on such shares shall be
          allocated pro rata on a share-by-share basis among all
          such shares at the time outstanding.  The Board of
          Directors may fix a record date for the determination of
          holders of shares of Series A Junior Participating
          Preferred Stock entitled to receive payment of a dividend
          or distribution declared thereon, which record date shall
          be no more than 30 days prior to the date fixed for the
          payment thereof. 

                    Section 3.  Voting Rights.  The holders of
          shares of Series A Junior Participating Preferred Stock
          shall have the following voting rights: 

                    (A)  Subject to the provision for adjustment
          hereinafter set forth, each share of Series A Junior
          Participating Preferred Stock shall entitle the holder
          thereof to 1,000 votes on all matters submitted to a vote
          of the shareholders of the Corporation.  In the event the
          Corporation shall at any time after the Rights
          Declaration Date (i) declare any dividend on Common
          Shares payable in Common Shares, (ii) subdivide the
          outstanding Common Shares, or (iii) combine the
          outstanding Common Shares into a smaller number of
          shares, then in each such case the number of votes per
          share to which holders of shares of Series A Junior
          Participating Preferred Stock were entitled immediately
          prior to such event shall be adjusted by multiplying such
          number by a fraction the numerator of which is the number
          of Common Shares outstanding immediately after such event
          and the denominator of which is the number of Common
          Shares that were outstanding immediately prior to such
          event. 

                    (B)  Except as otherwise provided herein or by
          law, the holders of shares of Series A Junior
          Participating Preferred Stock and the holders of Common
          Shares shall vote together as one class on all matters
          submitted to a vote of shareholders of the Corporation. 

                         (C)  (i)  If at any time dividends on
               any Series A Junior Participating Preferred
               Stock shall be in arrears in an amount equal to
               six (6) quarterly dividends thereon, the
               occurrence of such contingency shall mark the
               beginning of a period (herein called a "default
               period") which shall extend until such time
               when all accrued and unpaid dividends for all
               previous quarterly dividend periods and for the
               current quarterly dividend period on all shares
               of Series A Junior Participating Preferred
               Stock then outstanding shall have been declared
               and paid or set apart for payment.  During each
               default period, all holders of Preferred Stock
               (including holders of the Series A Junior
               Participating Preferred Stock) with dividends
               in arrears in an amount equal to six (6)
               quarterly dividends thereon, voting as a class,
               irrespective of series, shall have the right to
               elect two (2) directors. 

                         (ii)  During any default period, such
               voting right of the holders of Series A Junior
               Participating Preferred Stock may be exercised
               initially at a special meeting called pursuant
               to subparagraph (iii) of this Section 3(C) or
               at any annual meeting of shareholders, and
               thereafter at annual meetings of shareholders,
               provided that such voting right shall not be
               exercised unless the holders of ten percent
               (10%) in number of shares of Preferred Stock
               outstanding shall be present in person or by
               proxy.  The absence of a quorum of the holders
               of Common Shares shall not affect the exercise
               by the holders of Preferred Stock of such
               voting right.  At any meeting at which the
               holders of Preferred Stock shall exercise such
               voting right initially during an existing
               default period, they shall have the right,
               voting as a class, to elect directors to fill
               such vacancies, if any, in the Board of
               Directors as may then exist up to two (2)
               directors or, if such right is exercised at an
               annual meeting, to elect two (2) directors.  If
               the number which may be so elected at any
               special meeting does not amount to the required
               number, the holders of the Preferred Stock
               shall have the right to make such increase in
               the number of directors as shall be necessary
               to permit the election by them of the required
               number.  After the holders of the Preferred
               Stock shall have exercised their right to elect
               directors in any default period and during the
               continuance of such period, the number of
               directors shall not be increased or decreased
               except by vote of the holders of Preferred
               Stock as herein provided or pursuant to the
               rights of any equity securities ranking senior
               to or pari passu with the Series A Junior
               Participating Preferred Stock. 
           
                         (iii)  Unless the holders of
               Preferred Stock shall, during an existing
               default period, have previously exercised their
               right to elect directors, the Board of
               Directors may order, or, subject to the
               provisions of the Restated Certificate of
               Incorporation, as amended, any stockholder or
               shareholders owning in the aggregate not less
               than ten percent (10%) of the total number of
               shares of Preferred Stock outstanding,
               irrespective of series, may request, the
               calling of special meeting of the holders of
               Preferred Stock, which meeting shall thereupon
               be called by the President, a Vice-President or
               the Secretary of the Corporation.  Notice of
               such meeting and of any annual meeting at which
               holders of Preferred Stock are entitled to vote
               pursuant to this Paragraph (C)(iii) shall be
               given to each holder of record of Preferred
               Stock by mailing a copy of such notice to him
               or her at his or her last address as the same
               appears on the books of the Corporation.  Such
               meeting shall be called for a time not earlier
               than 20 days and not later than 60 days after
               such order or request or in default of the
               calling of such meeting within 60 days after
               such order or request, such meeting may be
               called on similar notice by any shareholder or
               shareholders owning in the aggregate not less
               than ten percent (10%) of the total number of
               shares of Preferred Stock outstanding. 
               Notwithstanding the provisions of this
               Paragraph (C)(iii), no such special meeting
               shall be called during the period within 60
               days immediately preceding the date fixed for
               the next annual meeting of the shareholders. 
           
                         (iv)  In any default period, the
               holders of Common Shares, and other classes of
               stock of the Corporation if applicable, shall
               continue to be entitled to elect the whole
               number of directors until the holders of
               Preferred Stock shall have exercised their
               right to elect two (2) directors voting as a
               class, after the exercise of which right (x)
               the directors so elected by the holders of
               Preferred Stock shall continue in office until
               their successors shall have been elected by
               such holders or until the expiration of the
               default period, and (y) any vacancy in the
               Board of Directors may (except as provided in
               Paragraph (C)(ii) of this Section 3) be filled
               by vote of a majority of the remaining
               directors theretofore elected by the holders of
               the class of stock which elected the Director
               whose office shall have become vacant. 
               References in this Paragraph (C) to directors
               elected by the holders of particular class of
               stock shall include directors elected by such
               directors to fill vacancies as provided in
               clause (y) of the foregoing sentence. 
           
                         (v)  Immediately upon the expiration
               of a default period, (x) the right of the
               holders of Preferred Stock as a class to elect
               directors shall cease, (y) the term of any
               directors elected by the holders of Preferred
               Stock as a class shall terminate, and (z) the
               number of directors shall be such number as may
               be provided for in the Restated Certificate of
               Incorporation or By-laws irrespective of any
               increase made pursuant to the provisions of
               Paragraph (C)(ii) of this Section 3 (such
               number being subject, however, to change
               thereafter in any manner provided by law or in
               the Restated Certificate of Incorporation or
               By-Laws).  Any vacancies in the Board of
               Directors effected by the provisions of clauses
               (y) and (z) in the preceding sentence may be
               filled by a majority of the remaining
               directors. 

                    (D)  Except as set forth herein, holders of
          Series A Junior Participating Preferred Stock shall have
          no special voting rights and their consent shall not be
          required (except to the extent they are entitled to vote
          with holders of Common Shares as set forth herein) for
          taking any corporate action. 

                    Section 4.  Certain Restrictions. 

                    (A)  Whenever quarterly dividends or other
          dividends or distributions payable on the Series A Junior
          Participating Preferred Stock as provided in Section 2
          are in arrears, thereafter and until all accrued and
          unpaid dividends and distributions, whether or not
          declared, on shares of Series A Junior Participating
          Preferred Stock outstanding shall have been paid in full,
          the Corporation shall not 
           
                              (i)  declare or pay dividends
               on, make any other distributions on, or redeem
               or purchase or otherwise acquire for
               consideration any shares of stock ranking
               junior (either as to dividends or upon
               liquidation, dissolution or winding up) to the
               Series A Junior Participating Preferred Stock; 

                              (ii)  declare or pay dividends
               on or make any other distributions on any
               shares of stock ranking on a parity (either as
               to dividends or upon liquidation, dissolution
               or winding up) with the Series A Junior
               Participating Preferred Stock, except dividends
               paid ratably on the Series A Junior
               Participating Preferred Stock and all such
               parity stock on which dividends are payable or
               in arrears in proportion to the total amounts
               to which the holders of all such shares are
               then entitled; 

                              (iii)  redeem or purchase or
               otherwise acquire for consideration shares of
               any stock ranking on a parity (either as to
               dividends or upon liquidation, dissolution or
               winding up) with the Series A Junior
               Participating Preferred Stock, provided that
               the Corporation may at any time redeem,
               purchase or otherwise acquire shares of any
               such parity stock in exchange for shares of any
               stock of the Corporation ranking junior (either
               as to dividends or upon dissolution,
               liquidation or winding up) to the Series A
               Junior Participating Preferred Stock; or
           
                              (iv)  purchase or otherwise
               acquire for consideration any shares of Series
               A Junior Participating Preferred Stock, or any
               shares of stock ranking on a parity with the
               Series A Junior Participating Preferred Stock,
               except in accordance with a purchase offer made
               in writing or by publication (as determined by
               the Board of Directors) to all holders of such
               shares upon such terms as the Board of
               Directors, after consideration of the
               respective annual dividend rates and other
               relative rights and preferences of the
               respective series and classes, shall determine
               in good faith will result in fair and equitable
               treatment among the respective series or
               classes. 
           
                    (B)  The Corporation shall not permit any
          subsidiary of the Corporation to purchase or otherwise
          acquire for consideration any shares of stock of the
          Corporation unless the Corporation could, under Paragraph
          (A) of this Section 4, purchase or otherwise acquire such
          shares at such time and in such manner. 
           
                    Section 5.  Reacquired Shares.  Any shares of
          Series A Junior Participating Preferred Stock purchased
          or otherwise acquired by the Corporation in any manner
          whatsoever shall be retired and cancelled promptly after
          the acquisition thereof.  All such shares shall upon
          their cancellation become authorized but unissued shares
          of Preferred Stock and may be reissued as part of a new
          series of Preferred Stock to be created by resolution or
          resolutions of the Board of Directors, subject to the
          conditions and restrictions on issuance set forth herein.

                    Section 6.  Liquidation, Dissolution or Winding
          Up.  (A)  Upon any liquidation (voluntary or otherwise),
          dissolution or winding up of the Corporation, no
          distribution shall be made to the holders of shares of
          stock ranking junior (either as to dividends or upon
          liquidation, dissolution or winding up) to the Series A
          Junior Participating Preferred Stock unless, prior
          thereto, the holders of shares of Series A Junior
          Participating Preferred Stock shall have received an
          amount equal to 1,000 times the Exercise Price, plus an
          amount equal to accrued and unpaid dividends and
          distributions thereon, whether or not declared, to the
          date of such payment (the "Series A Liquidation
          Preference").  Following the payment of the full amount
          of the Series A Liquidation Preference, no additional
          distributions shall be made to the holders of shares of
          Series A Junior Participating Preferred Stock unless,
          prior thereto, the holders of Common Shares shall have
          received an amount per share (the "Common Adjustment")
          equal to the quotient obtained by dividing (i) the Series
          A Liquidation Preference by (ii) 1,000 (as appropriately
          adjusted as set forth in subparagraph (C) below to
          reflect such events as stock splits, stock dividends and
          recapitalizations with respect to the Common Shares)
          (such number in clause (ii), the "Adjustment Number"). 
          Following the payment of the full amount of the Series A
          Liquidation Preference and the Common Adjustment in
          respect of all outstanding shares of Series A Junior
          Participating Preferred Stock and Common Shares,
          respectively, holders of Series A Junior Participating
          Preferred Stock and holders of Common Shares shall
          receive their ratable and proportionate share of the
          remaining assets to be distributed in the ratio of the
          Adjustment Number to 1 with respect to such Preferred
          Stock and Common Shares, on a per share basis,
          respectively. 

                    (B)  In the event, however, that there are not
          sufficient assets available to permit payment in full of
          the Series A Liquidation Preference and the liquidation
          preferences of all other series of preferred stock, if
          any, which rank on a parity with the Series A Junior
          Participating Preferred Stock, then such remaining assets
          shall be distributed ratably to the holders of such
          parity shares in proportion to their respective
          liquidation preferences.  In the event, however, that
          there are not sufficient assets available to permit
          payment in full of the Common Adjustment, then such
          remaining assets shall be distributed ratably to the
          holders of Common Shares. 

                    (C)  In the event the Corporation shall at any
          time after the Rights Declaration Date (i) declare any
          dividend on Common Shares payable in Common Shares, (ii)
          subdivide the outstanding Common Shares, or (iii) combine
          the outstanding Common Shares into a smaller number of
          shares, then in each such case the Adjustment Number in
          effect immediately prior to such event shall be adjusted
          by multiplying such Adjustment Number by a fraction the
          numerator of which is the number of Common Shares
          outstanding immediately after such event and the
          denominator of which is the number of Common Shares that
          were outstanding immediately prior to such event. 

                    Section 7.  Consolidation, Merger, etc.  In
          case the Corporation shall enter into any consolidation,
          merger, combination or other transaction in which the
          Common Shares are exchanged for or changed into other
          stock or securities, cash and/or any other property, then
          in any such case the shares of Series A Junior
          Participating Preferred Stock shall at the same time be
          similarly exchanged or changed in an amount per share
          (subject to the provision for adjustment hereinafter set
          forth) equal to 1,000 times the aggregate amount of
          stock, securities, cash and/or any other property
          (payable in kind), as the case may be, into which or for
          which each Common Shares is changed or exchanged.  In the
          event the Corporation shall at any time after the Rights
          Declaration Date (i) declare any dividend on Common
          Shares payable in shares of Common Shares, (ii) subdivide
          the outstanding Common Shares, or (iii) combine the
          outstanding Common Shares into a smaller number of
          shares, then in each such case the amount set forth in
          the preceding sentence with respect to the exchange or
          change of shares of Series A Junior Participating
          Preferred Stock shall be adjusted by multiplying such
          amount by a fraction the numerator of which is the number
          of Common Shares outstanding immediately after such event
          and the denominator of which is the number of shares of
          Common Shares that were outstanding immediately prior to
          such event. 

                    Section 8.  No Redemption.  The shares of
          Series A Junior Participating Preferred Stock shall not
          be redeemable.

                    Section 9.  Ranking.  The Series A Junior
          Preferred Stock shall rank junior to all other series of
          the Corporation's Preferred Stock as to the payment of
          dividends and the distribution of assets, unless the
          terms of any such series shall provide otherwise.

                    Section 10.  Amendment.  The Restated
          Certificate of Incorporation, as amended, of the
          Corporation shall not be further amended in any manner
          which would materially alter or change the powers,
          preferences or special rights of the Series A Junior
          Participating Preferred Stock so as to affect them
          adversely without the affirmative vote of the holders of
          a majority or more of the outstanding shares of Series A
          Junior Participating Preferred Stock, voting separately
          as a class. 

                    Section 11.  Fractional Shares.  Series A
          Junior Participating Preferred Stock may be issued in
          fractions of a share which shall entitle the holder, in
          proportion to such holders fractional shares, to exercise
          voting rights, receive dividends, participate in
          distributions and to have the benefit of all other rights
          of holders of Series A Junior Participating Preferred
          Stock.

                    5.  The manner in which the foregoing amendment
          of the Restated Certificate of Incorporation was
          authorized is a follows:  The Board of Directors of the
          Corporation authorized the amendment under the authority
          vested in said Board under the provisions of the
          Certificate of Incorporation and of Section 502 of the
          Business Corporation Law.

                    IN WITNESS WHEREOF, we have subscribed this
          document on the date set opposite each of our names below
          and do hereby affirm, under the penalties of perjury,
          that the statements contained therein have been examined
          by us and are true and correct.

          Date:  October   , 1996

                                                                       
                                        Name:  Leonard S. Schleifer
                                        Title: President

                                                                       
                                        Name:  Paul Lubetkin
                                        Title: Secretary



                                                              Exhibit B

          [Form of Rights Certificate]

          Certificate No. R-                            ________ Rights

          NOT EXERCISABLE AFTER OCTOBER, 2006 OR EARLIER IF REDEEMED BY
          THE COMPANY.  THE RIGHTS ARE SUBJECT TO REDEMPTION, AT THE
          OPTION OF THE COMPANY, AT $0.01 PER RIGHT ON THE TERMS SET
          FORTH IN THE RIGHTS AGREEMENT.  UNDER CERTAIN CIRCUMSTANCES,
          RIGHTS BENEFICIALLY OWNED BY AN ACQUIRING PERSON (AS SUCH
          TERM IS DEFINED IN THE RIGHTS AGREEMENT) AND ANY SUBSEQUENT
          HOLDER OF SUCH RIGHTS MAY BECOME NULL AND VOID.  [THE RIGHTS
          REPRESENTED BY THIS RIGHTS CERTIFICATE ARE OR WERE
          BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN ACQUIRING
          PERSON OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON
          (AS SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT). 
          ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE RIGHTS
          REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE
          CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF SUCH
          AGREEMENT.](1)

          Rights Certificate

          REGENERON PHARMACEUTICALS, INC.

                    This certifies that                      , or
          registered assigns, is the registered owner of the number of
          Rights set forth above, each of which entitles the owner
          thereof, subject to the terms, provisions and conditions of
          the Rights Agreement, dated as of September 20, 1996 (the
          "Rights Agreement"), between Regeneron Pharmaceuticals, Inc.,
          a New York corporation (the "Company"), and ChaseMellon
          Shareholder Services L.L.C., a New Jersey limited liability
          company (the "Rights Agent"), to purchase from the Company at
          any time prior to 5:00 P.M. (New York City time) on October
          18, 2006 at the office or offices of the Rights Agent
          designated for such purpose, or its successors as Rights
          Agent, one one-thousandth of a fully paid, non-assessable
          share of Series A Junior Participating Preferred Stock (the
          "Preferred Stock") of the Company, at a purchase price of
          $120.00 per one one-thousandth of a share (the "Purchase
          Price"), upon presentation and surrender of this Rights
          Certificate with the Form of Election to Purchase and related
          Certificate duly executed.  The number of Rights evidenced by
          this Rights Certificate (and the number of shares which may
          be purchased upon exercise thereof) set forth above, and the
          Purchase Price per share set forth above, are the number and
          Purchase Price as of October 18, 1996 based on the Preferred
          Stock as constituted at such date.  The Company reserves the
          right to require prior to the occurrence of a Triggering
          Event (as such term is defined in the Rights Agreement) that

          _____________________
          1    The portion of the legend in brackets shall be
               inserted only if applicable and shall replace the
               preceding sentence.


          a number of Rights be exercised so that only whole shares of
          Preferred Stock will be issued.

                    Upon the occurrence of a Section 11(a)(ii) Event
          (as such term is defined in the Rights Agreement), if the
          Rights evidenced by this Rights Certificate are beneficially
          owned by (i) an Acquiring Person or an Affiliate or Associate
          of any such Acquiring Person (as such terms are defined in
          the Rights Agreement), (ii) a transferee of any such
          Acquiring Person, Associate or Affiliate, or (iii) under
          certain circumstances specified in the Rights Agreement, a
          transferee of a person who, after such transfer, became an
          Acquiring Person, or an Affiliate or Associate of an
          Acquiring Person, such Rights shall become null and void and
          no holder hereof shall have any right with respect to such
          Rights from and after the occurrence of such Section
          11(a)(ii) Event.

                    As provided in the Rights Agreement, the Purchase
          Price and the number and kind of shares of Preferred Stock or
          other securities, which may be purchased upon the exercise of
          the Rights evidenced by this Rights Certificate are subject
          to modification and adjustment upon the happening of certain
          events, including Triggering Events.

                    This Rights Certificate is subject to all of the
          terms, provisions and conditions of the Rights Agreement,
          which terms, provisions and conditions are hereby
          incorporated herein by reference and made a part hereof and
          to which Rights Agreement reference is hereby made for a full
          description of the rights, limitations of rights,
          obligations, duties and immunities hereunder of the Rights
          Agent, the Company and the holders of the Rights
          Certificates, which limitations of rights include the
          temporary suspension of the exercisability of such Rights
          under the specific circumstances set forth in the Rights
          Agreement.  Copies of the Rights Agreement are on file at the
          above-mentioned office of the Rights Agent and are also
          available upon written request to the Rights Agent.

                    This Rights Certificate, with or without other
          Rights Certificates, upon surrender at the principal office
          or offices of the Rights Agent designated for such purpose,
          may be exchanged for another Rights Certificate or Rights
          Certificates of like tenor and date evidencing Rights
          entitling the holder to purchase a like aggregate number of
          one one-thousandths of a share of Preferred Stock as the
          Rights evidenced by the Rights Certificate or Rights
          Certificates surrendered shall have entitled such holder to
          purchase.  If this Rights Certificate shall be exercised in
          part, the holder shall be entitled to receive upon surrender
          hereof another Rights Certificate or Rights Certificates for
          the number of whole Rights not exercised.

                    Subject to the provisions of the Rights Agreement,
          the Rights evidenced by this Certificate may be redeemed by
          the Company at its option at a redemption price of $0.01 per
          Right at any time prior to the earlier of the close of
          business on (i) the tenth day following the Stock Acquisition
          Date (as such time period may be extended pursuant to the
          Rights Agreement), and (ii) the Final Expiration Date.  In
          addition, the Rights may be exchanged, in whole or in part,
          for Common Shares, or shares of preferred stock of the
          Company having essentially the same value or economic rights
          as such shares.  Immediately upon the action of the Board of
          Directors of the Company authorizing any such exchange, and
          without any further action or any notice, the Rights (other
          than Rights which are not subject to such exchange) will
          terminate and the Rights will only enable holders to receive
          the shares issuable upon such exchange.

                    No fractional shares of Preferred Stock will be
          issued upon the exercise of any Right or Rights evidenced
          hereby (other than fractions which are integral multiples of
          one one-thousandth of a share of Preferred Stock, which may,
          at the election of the Company, be evidenced by depositary
          receipts), but in lieu thereof a cash payment will be made,
          as provided in the Rights Agreement.

                    No holder of this Rights Certificate shall be
          entitled to vote or receive dividends or be deemed for any
          purpose the holder of shares of Preferred Stock or of any
          other securities of the Company which may at any time be
          issuable on the exercise hereof, nor shall anything contained
          in the Rights Agreement or herein be construed to confer upon
          the holder hereof, as such, any of the rights of a
          stockholder of the Company or any right to vote for the
          election of directors or upon any matter submitted to
          shareholders at any meeting thereof, or to give or withhold
          consent to any corporate action, or, to receive notice of
          meetings or other actions affecting shareholders (except as
          provided in the Rights Agreement), or to receive dividends or
          subscription rights, or otherwise, until the Right or Rights
          evidenced by this Rights Certificate shall have been
          exercised as provided in the Rights Agreement.

                    This Rights Certificate shall not be valid or
          obligatory for any purpose until it shall have been
          countersigned by the Rights Agent.

                    WITNESS the facsimile signature of the proper
          officers of the Company and its corporate seal.

          Dated as of              ,     

          ATTEST:                       REGENERON PHARMACEUTICALS, INC.

          ____________________          By___________________________
              Secretary                   Title:

          Countersigned:

          CHASEMELLON SHAREHOLDER
            SERVICES L.L.C.

          By______________________
             Authorized Signature


                 [Form of Reverse Side of Rights Certificate]

                              FORM OF ASSIGNMENT

               (To be executed by the registered holder if such
             holder desires to transfer the Rights Certificate.)

          FOR VALUE RECEIVED                                     
          hereby sells, assigns and transfer unto                
                                                                 
                (Please print name and address of transferee)

          this Rights Certificate, together with all right, title
          and interest therein, and does hereby irrevocably
          constitute and appoint _________________ Attorney, to
          transfer the within Rights Certificate on the books of
          the within-named Company, with full power of
          substitution.

          Dated: ___________________, 19__

                                         ___________________________
                                        Signature

          Signature Guaranteed:

                                 Certificate

                    The undersigned hereby certifies by checking
          the appropriate boxes that:

                    (1)  this Rights Certificate [  ] is [  ] is
          not being sold, assigned and transferred by or on behalf
          of a Person who is or was an Acquiring Person or an
          Affiliate or Associate of any such Acquiring Person (as
          such terms are defined pursuant to the Rights Agreement);

                    (2)  after due inquiry and to the best
          knowledge of the undersigned, it [  ] did [  ] did not
          acquire the Rights evidenced by this Rights Certificate
          from any Person who is, was or subsequently became an
          Acquiring Person or an Affiliate or Associate of an
          Acquiring Person.

          Dated: __________________, 19__     ______________________
                                             Signature

          Signature Guaranteed:

                                    NOTICE

                    The signature to the foregoing Assignment and
          Certificate must correspond to the name as written upon
          the face of this Rights Certificate in every particular,
          without alteration or enlargement or any change
          whatsoever.


                         FORM OF ELECTION TO PURCHASE
          (To be executed if holder desires
          to exercise Rights represented
          by the Rights Certificate.)

          To: REGENERON PHARMACEUTICALS, INC.:

                    The undersigned hereby irrevocably elects to
          exercise __________ Rights represented by this Rights
          Certificate to purchase the shares of Preferred Stock
          issuable upon the exercise of the Rights (or such other
          securities of the Company or of any other person which
          may be issuable upon the exercise of the Rights) and
          requests that certificates for such shares be issued in
          the name of and delivered to:

          Please insert social security
          or other identifying number

                                                                 
                       (Please print name and address)

                                                                 

                    If such number of Rights shall not be all the
          Rights evidenced by this Rights Certificate, a new Rights
          Certificate for the balance of such Rights shall be
          registered in the name of and delivered to:

          Please insert social security
          or other identifying number

                                                                 
                       (Please print name and address)

                                                                 

          Dated:  _______________, 19__
                                              ______________________
                                             Signature

          Signature Guaranteed:

                                 Certificate

                    The undersigned hereby certifies by checking
          the appropriate boxes that:

                    (1)  the Rights evidenced by this Rights
          Certificate [ ] are [ ] are not being exercised by or on
          behalf of a Person who is or was an Acquiring Person or
          an Affiliate or Associate of any such Acquiring Person
          (as such terms are defined pursuant to the Rights
          Agreement);

                    (2)  after due inquiry and to the best
          knowledge of the undersigned, it [ ] did [ ] did not
          acquire the Rights evidenced by this Rights Certificate
          from any Person who is, was or became an Acquiring Person
          or an Affiliate or Associate of an Acquiring Person.


          Dated: ___________, 19__       ___________________________
                                        Signature

          Signature Guaranteed:

                                    NOTICE

                    The signature to the foregoing Election to
          Purchase and Certificate must correspond to the name as
          written upon the face of this Rights Certificate in every
          particular, without alteration or enlargement or any
          change whatsoever.



                                                           Exhibit C

                    DETAILED SUMMARY OF RIGHTS TO PURCHASE
                SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                    On September 20, 1996, the Board of Directors
          of Regeneron Pharmaceuticals, Inc. (the "Company")
          adopted a Shareholder Rights Plan, providing that one
          Right shall be attached to each share of Common Stock,
          par value $0.001 per share (the "Common Shares") and
          Class A Common Stock, par value $0.001 per share (the
          "Class A Stock" and, together with the Common Shares, the
          "Common Stock") of the Company.  Each Right entitles the
          registered holder to purchase from the Company a unit (a
          "Unit") consisting of one one-thousandth of a share of
          Series A Junior Participating Preferred Stock, par value
          $0.01 per share (the "Preferred Stock"), at a purchase
          price (the "Purchase Price") of $120.00 per one one-
          thousandth of a share of Preferred Stock (a "Unit"),
          subject to adjustment.  The description and terms of the
          Rights are set forth in the Rights Agreement (the "Rights
          Agreement"), dated as of September 20, 1996, between the
          Company and ChaseMellon Shareholder Services L.L.C., a
          New Jersey limited liability company, as Rights Agent
          (the "Rights Agent").

                    Initially, the Rights will be attached to all
          Common Stock certificates representing shares then
          outstanding, and no separate Rights Certificate will be
          distributed.  The Rights will separate from the Common
          Stock upon the earlier of (i) 10 days following a public
          announcement that a person or group of affiliated or
          associated persons (an "Acquiring Person") has acquired,
          or has obtained the right to acquire, beneficial ownership
          of 20% or more of the outstanding shares of Common Stock
          (the "Stock Acquisition Date") or (ii) ten business days
          following the commencement of a tender offer or exchange
          offer that would result in a person or group beneficially
          owning 20% or more of such outstanding shares of Common
          Stock (the earlier of (i) and (ii), the "Distribution
          Date").  The definition of Acquiring Person, subject to
          certain limitations set forth in the Rights Agreement,
          excludes Amgen Inc., which currently holds Common Stock,
          Series A Stock and a Warrant to purchase Common Stock and
          Leonard S. Schleifer, who currently holds Class A Stock
          and certain permitted transferees of Dr. Schleifer,
          subject to certain limitations.  Until the Distribution
          Date, (i) the Rights will be evidenced by the Common Stock
          certificates and will be transferred with and only with
          such Common Stock certificates, (ii) new Common Stock
          certificates will contain a notation incorporating the
          Rights Agreement by reference and (iii) the surrender for
          transfer of any certificates for Common Stock outstanding
          will also constitute the transfer of the Rights associated
          with the Common Stock represented by such certificate.

                    The Rights are not exercisable until the
          Distribution Date and will expire at the close of business
          on October 18, 2006 unless earlier redeemed by the Company
          as described below.  At no time will the Rights have any
          voting power.

                    As soon as practicable after the Distribution
          Date, Rights Certificates will be mailed to holders of
          record of the Common Stock as of the close of business on
          the Distribution Date and, thereafter, the separate Rights
          Certificates alone will represent the Rights.  Except as
          otherwise determined by the Board of Directors, only
          shares of Common Stock issued prior to the Distribution
          Date will be issued with Rights. 

                    In the event that an Acquiring Person becomes
          the beneficial owner of 20% or more of the then
          outstanding shares of Common Stock (unless such
          acquisition is made pursuant to a tender or exchange offer
          for all outstanding shares of the Company, at a price
          determined by a majority of the independent directors of
          the Company who are not representatives, nominees,
          Affiliates or Associates of an Acquiring Person to be fair
          and otherwise in the best interest of the Company and its
          shareholders after receiving advice from one or more
          investment banking firms (a "Qualifying Offer")), each
          holder of a Right will thereafter have the right to
          receive, upon exercise, Common Shares (or, in certain
          circumstances, cash, property or other securities of the
          Company), having a value equal to two times the Exercise
          Price of the Right.  The Exercise Price is the Purchase
          Price times the number of shares of Common Shares
          associated with each Right (initially, one). 
          Notwithstanding any of the foregoing, following the
          occurrence of any of the events set forth in this
          paragraph (the "Flip-in Events"), all Rights that are, or
          (under certain circumstances specified in the Rights
          Agreement) were, beneficially owned by any Acquiring
          Person will be null and void.  However, Rights are not
          exercisable following the occurrence of any of the Flip-in
          Events set forth above until such time as the Rights are
          no longer redeemable by the Company as set forth below.

                    In the event that following the Stock
          Acquisition Date, (i) the Company engages in a merger or
          business combination transaction in which the Company is
          not the surviving corporation (other than a merger
          consummated pursuant to a Qualifying Offer); (ii) the
          Company engages in a merger or business combination
          transaction in which the Company is the surviving
          corporation and the Common Stock of the Company is changed
          or exchanged; or (iii) more than 50% of the Company's
          assets or earning power is sold or transferred, each
          holder of a Right (except Rights which have previously
          been voided as set forth above) shall thereafter have the
          right to receive, upon exercise of the Right, common stock
          of the acquiring company having a value equal to two times
          the Exercise Price of the Right.

                    The Purchase Price payable, and the number of
          Units of Preferred Stock or other securities or property
          issuable upon exercise of the Rights are subject to
          adjustment from time to time to prevent dilution (i) in
          the event of a stock dividend on, or a subdivision,
          combination or reclassification of, the Preferred Stock,
          (ii) if holders of the Preferred Stock are granted certain
          rights or warrants to subscribe for Preferred Stock or
          convertible securities at less than the current market
          price of the Preferred Stock, or (iii) upon the
          distribution to holders of the Preferred Stock of
          evidences of indebtedness or assets (excluding regular
          quarterly cash dividends) or of subscription rights or
          warrants (other than those referred to above).

                    With certain exceptions, no adjustments in the
          Purchase Price will be required until cumulative
          adjustments amount to at least 1% of the Purchase Price. 
          No fractional Units will be issued and, in lieu thereof,
          an adjustment in cash will be made based on the market
          price of the Preferred Stock on the last trading date
          prior to the date of exercise.

                    At any time until ten days following the Stock
          Acquisition Date, the Company may redeem the Rights in
          whole, but not in part, at a price of $0.01 per Right. 
          Immediately upon the action of the Board of Directors
          ordering redemption of the Rights, the Rights will
          terminate and the only right of the holders of Rights will
          be to receive the $0.01 redemption price.

                    Until a Right is exercised, the holder thereof,
          as such, will have no rights as a shareholder of the
          Company, including, without limitation, the right to vote
          or to receive dividends.  While the distribution of the
          Rights will not be taxable to shareholders or to the
          Company, shareholders may, depending upon the
          circumstances, recognize taxable income in the event that
          the Rights become exercisable for Common Shares (or other
          consideration) of the Company as set forth above or in the
          event that the Rights are redeemed.

                    Other than those provisions relating to the
          principal economic terms of the Rights, any of the
          provisions of the Rights Agreement may be amended by the
          Board of Directors of the Company prior to the
          Distribution Date.  After the Distribution Date, the
          provisions of the Rights Agreement may be amended by the
          Board in order to cure any ambiguity, to make changes
          which do not adversely affect the interests of holders of
          Rights (excluding the interest of any Acquiring Person),
          or to shorten or lengthen any time period under the Rights
          Agreement; provided, however, that no amendment to adjust
          the time period governing redemption shall be made at such
          time as the Rights are not redeemable.

                    A copy of the Rights Agreement is being filed
          with the Securities and Exchange Commission as an Exhibit
          to a Registration Statement on Form 8-A.  A copy of the
          Rights Agreement is available free of charge from the
          Company.  This Summary Description of the Rights does not
          purport to be complete and is qualified in its entirety by
          reference to the Rights Agreement, which is incorporated
          herein by reference.



          FOR IMMEDIATE RELEASE

                   REGENERON ADOPTS SHAREHOLDER RIGHTS PLAN

                    Tarrytown, New York (September 20, 1996) --
          Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN), announced
          today that on September 20, 1996 its Board of Directors
          adopted a Shareholder Rights Plan in which rights will be
          distributed as a dividend at the rate of one Right for
          each share of Common Stock, par value $0.001 per share
          (the "Common Shares"), and for each share of Class A
          Stock, par value $0.001 per share (the "Class A Stock"
          and, together with the Common Shares, the "Common Stock")
          of the Company held by shareholders of record as of the
          close of business on October 18, 1996.  The Rights will
          expire on October 18, 2006.

                    Regeneron's Rights Plan is designed to protect
          Regeneron's shareholders' rights to retain their equity
          investment in the Company and receive full value for
          their investment, while not foreclosing a fair
          acquisition bid for the Company.  It aims to deter
          coercive takeover tactics including the accumulation of
          shares in the open market or through private transactions
          and to prevent an acquirer from gaining control of the
          Company without offering a fair price to all of the
          Company's shareholders.  The Rights Plan was not adopted
          in response to any takeover attempt.

                    Each Right initially will entitle shareholders
          to buy one unit of a share of preferred stock for $120. 
          The Rights will be exercisable only if a person or group
          acquires beneficial ownership of 20% or more of the
          Company's Common Stock or commences a tender or exchange
          offer upon consummation of which such person or group
          would beneficially own 20% or more of the outstanding
          voting power of the Company.

                    Subject to certain exemptions, if any person
          becomes the beneficial owner of 20% or more of the
          Company's Common Stock, other than pursuant to a tender
          or exchange offer for all outstanding shares of the
          Company approved by a majority of the independent
          directors not affiliated with the 20%-or-more
          shareholder, then each right not owned by the 20%-or-more
          shareholder or related parties will entitle its holder to
          purchase, at the Right's then current exercise price,
          shares of the Company's Common Shares (or, in certain
          circumstances as determined by the Board, cash, other
          property, or other securities) having a value of twice
          the Right's then current exercise price.  In addition, if
          after any person has become a 20%-or-more shareholder,
          Regeneron is involved in a merger or other business
          combination transaction with another person in which the
          Company does not survive or in which its Common Stock is
          changed or exchanged, or sells 50% or more of its assets
          or earning power to another person, each Right will
          entitle each holder other than any person who has become
          a 20%-or-more shareholder, to purchase, at the Right's
          then current exercise price, shares of common stock of
          such other person having a value of twice the Right's
          then current exercise price.

                    The Company will generally be entitled to
          redeem the Rights for one cent per Right at any time
          until ten days (subject to extension) following a public
          announcement that a 20% position in the Company's Common
          Stock has been acquired.

                    Details of the Shareholder Rights Plan are
          outlined in a letter which will be mailed to all
          shareholders after October 18, 1996.

                    Regeneron is a leader in the application of
          molecular and cell biology to discover novel potential
          therapeutics for human medical conditions.  The Company
          is applying its technological expertise in protein growth
          factors, their receptors, and their mechanisms of action
          to the discovery and development of neurotrophic factors
          for the potential treatment of neurodegenerative
          diseases, peripheral neuropathies, and nerve injury. 
          Regeneron is collaborating with Amgen Inc. in the
          development of two neurotrophic factors, brain-derived
          neurotrophic factor and neurotrophin-3, each of which is
          in human clinical studies.  More recently, Regeneron has
          used its technological expertise to attempt to identify
          treatments for diseases and conditions outside of the
          nervous system, such as inflammatory and muscle diseases,
          angiogenesis, hematopoiesis, and cancer.

                                     ###

          CONTACT:  Murray A. Goldberg
                    Vice President Finance and Administration and CFO
                    Regeneron Pharmaceuticals, Inc.
                    (914) 345-7492

                    Michael Gross
                    Principal
                    Robinson Lerer Sawyer Miller
                    (212) 484-7721

          Regeneron's recent news releases can be obtained by
          dialing (800) 311-0841 for fax copies or by accessing the
          Internet at www.businesswire.com