BIOSITE DIAGNOSTICS INC
8-A12G, 1997-10-28
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-A

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

                        BIOSITE DIAGNOSTICS INCORPORATED
            --------------------------------------------------------
             (Exact name of registrant as specified in its charter)


          Delaware                                    33-0288606
 -------------------------                         ---------------------
  (State of incorporation                            (I.R.S. Employer
     or organization)                               Identification No.)


                11030 Roselle Street, San Diego, California 92121
               (Address of principal executive offices) (Zip Code)


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


     Title of each class                       Name of each exchange on which
     to be so registered                       each class is to be registered
    ---------------------                     ---------------------------------
            None                                            None

If this Form relates to the registration of a class of securities pursuant to
Section 12(b) of the Exchange Act and is effective pursuant to General
Instruction A.(c), please check the following box. [ ]

If this Form relates to the registration of a class of securities pursuant to
Section 12(g) of the Exchange Act and is effective pursuant to General
Instruction A.(d), please check the following box.[X]

Securities Act registration statement file number to which this form relates:

________ (if applicable)

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


             Series A Participating Preferred Stock Purchase Rights
            ---------------------------------------------------------
                                (Title of class)



<PAGE>   2
Item 1. Description of Securities to be Registered.

                                SUMMARY OF RIGHTS


        On October 22, 1997, the Board of Directors of Biosite Diagnostics
Incorporated (the "Company") declared a dividend distribution of one "Right" for
each outstanding share of common stock, par value $0.01 per share (the "Common
Stock"), of the Company to stockholders of record at the close of business on
November 3, 1997 (the "Record Date"). Except as set forth below, each Right,
when exercisable, entitles the registered holder to purchase from the Company
one one-thousandth of a share of a new series of preferred stock, designated as
Series A Participating Preferred Stock, par value $0.01 per share (the
"Preferred Stock"), at a price of $50.00 (the "Purchase Price"), subject to
adjustment. The description and terms of the Rights are set forth in a Rights
Agreement (the "Rights Agreement") between the Company and BankBoston, N.A., as
"Rights Agent."

        Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights certificates will
be distributed. The Rights will separate from the Common Stock and a
"Distribution Date" will occur upon the earliest of (i) a public announcement
that a person, entity or group of affiliated or associated persons and/or
entities (an "Acquiring Person") has acquired, or obtained the right to acquire,
beneficial ownership of 15% or more of the outstanding shares of Common Stock,
other than as a result of repurchases of stock by the Company or certain
inadvertent actions by institutional or certain other stockholders, or (ii) ten
days (unless such date is extended by the Board of Directors) following the
commencement of (or a public announcement of an intention to make) a tender
offer or exchange offer which would result in any person, entity or group of
affiliated or associated persons and/or entities becoming an Acquiring Person.

        Until the Distribution Date the Rights will be evidenced, with respect
to any of the Common Stock certificates outstanding as of the Record Date, by
such Common Stock certificate together with this Summary of Rights. The Rights
Agreement provides that, until the Distribution Date, the Rights will be
transferred with and only with Common Stock certificates. From as soon as
practicable after the Record Date and until the Distribution Date (or earlier
redemption or expiration of the Rights), new Common Stock certificates issued
after the Record Date upon transfer or new issuance of the Common Stock will
contain a notation incorporating the Rights Agreement by reference. Until the
Distribution Date (or earlier redemption or expiration of the Rights), the
surrender for transfer of any certificates for Common Stock outstanding as of
the Record Date (with or without this Summary of Rights attached) will also
constitute the transfer of the Rights associated with the Common Stock
represented by such certificate. As soon as practicable following the
Distribution Date, separate certificates evidencing the Rights ("Rights
Certificates") will be mailed to holders of record of the Common Stock as of the
close of business on the Distribution Date, and the separate Rights Certificates
alone will evidence the Rights.

        The Rights are not exercisable until the Distribution Date. The Rights
will expire on the earliest of (i) October 22, 2007, (ii) consummation of a
merger transaction with a Person




                                      -2-
<PAGE>   3
or group who acquired Common Stock pursuant to a Permitted Offer (as defined
below), and is offering in the merger the same price per share and form of
consideration paid in the Permitted Offer, or (iii) redemption or exchange of
the Rights by the Company as described below.

        The number of Rights associated with each share of Common Stock shall be
proportionately adjusted to prevent dilution in the event of a stock dividend
on, or a subdivision, combination or reclassification of, the Common Stock. The
Purchase Price payable, and the number of shares 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) upon the grant to holders of the Preferred Stock of certain rights
or warrants to subscribe for Preferred Stock, certain convertible securities or
securities having the same or more favorable rights, privileges and preferences
as the Preferred Stock 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
out of earnings or retained earnings) 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 require an
adjustment of at least 1% in such Purchase Price.

        In the event that, after the first date of public announcement by the
Company or an Acquiring Person that an Acquiring Person has become such, the
Company is involved in a merger or other business combination transaction
(whether or not the Company is the surviving corporation) or 50% or more of the
Company's assets or earning power are sold (in one transaction or a series of
transactions), proper provision shall be made so that each holder of a Right
(other than an Acquiring Person) shall there after have the right to receive,
upon the exercise thereof at the then current Purchase Price, that number of
shares of common stock of either the Company, in the event that it is the
surviving corporation of a merger or consolidation, or the acquiring company
(or, in the event there is more than one acquiring company, the acquiring
company receiving the greatest portion of the assets or earning power
transferred) which at the time of such transaction would have a market value of
two times the Purchase Price (such right being called the "Merger Right"). In
the event that a Person becomes the beneficial owner of 15% or more of the
outstanding shares of Common Stock (unless pursuant to a tender offer or
exchange offer for all outstanding shares of Common Stock at a price and on
terms determined prior to the date of the first acceptance of payment for any of
such shares by at least a majority of the members of the Board of Directors who
are not officers of the Company and are not Acquiring Persons or Affiliates or
Associates thereof to be both adequate and otherwise in the best interests of
the Company and its stockholders (a "Permitted Offer")), then proper provision
shall be made so that each holder of a Right will for a 60-day period (subject
to extension under certain circumstances) thereafter have the right to receive
upon exercise that number of shares of Common Stock (or, at the election of the
Company, which election may be obligatory if sufficient authorized shares of
Common Stock are not available, a combination of Common Stock, property, other
securities (e.g., Preferred Stock) and/or a reduction in the exercise price of
the Right) having a market value of two times the Purchase Price (such right
being




                                      -3-
<PAGE>   4
called the "Subscription Right"). The holder of a Right will continue to have
the Merger Right whether or not such holder exercises the Subscription Right.
Notwithstanding the foregoing, upon the occurrence of any of the events giving
rise to the exercisability of the Merger Right or the Subscription Right, any
Rights that are or were at any time after the Distribution Date owned by an
Acquiring Person shall immediately become null and void.

        At any time prior to the earlier to occur of (i) a Person becoming an
Acquiring Person or (ii) the expiration of the Rights, the Company may redeem
the Rights in whole, but not in part, at a price of $0.01 per Right (the
"Redemption Price"), which redemption shall be effective upon the action of the
Board of Directors. Additionally, the Company may thereafter redeem the then
outstanding Rights in whole, but not in part, at the Redemption Price (i) if
such redemption is incidental to a merger or other business combination
transaction or series of transactions involving the Company but not involving an
Acquiring Person or certain related Persons or (ii) following an event giving
rise to, and the expiration of the exercise period for, the Subscription Right
if and for as long as the Acquiring Person triggering the Subscription Right
beneficially owns securities representing less than 15% of the outstanding
shares of Common Stock and at the time of redemption there are no other
Acquiring Persons. The redemption of Rights described in the preceding sentence
shall be effective only as of such time when the Subscription Right is not
exercisable, and in any event, only after ten business days' prior notice. Upon
the effective date of the redemption of the Rights, the right to exercise the
Rights will terminate and the only right of the holders of Rights will be to
receive the Redemption Price.

        Subject to applicable law, the Board of Directors, at its option, may at
any time after a Person becomes an Acquiring Person (but not after the
acquisition by such Person of 50% or more of the outstanding Common Stock),
exchange all or part of the then outstanding and exercisable Rights (except for
Rights which have become void) for shares of Common Stock at a rate of one share
of Common Stock per Right or, alternatively, for substitute consideration
consisting of cash, securities of the Company or other assets (or any
combination thereof).

        The Preferred Stock purchasable upon exercise of the Rights will be
nonredeemable and junior to any other series of preferred stock the Company may
issue (unless otherwise provided in the terms of such stock). Each share of
Preferred Stock will have a preferential quarterly dividend in an amount equal
to 1,000 times the dividend declared on each share of Common Stock, but in no
event less than $100.00. In the event of liquidation, the holders of shares of
Preferred Stock will receive a preferred liquidation payment equal to the
greater of $1,000.00 or 1,000 times the payment made per each share of Common
Stock. Each share of Preferred Stock will have 1,000 votes, voting together with
the shares of Common Stock. In the event of any merger, consolidation or other
transaction in which shares of Common Stock are exchanged, each share of
Preferred Stock will be entitled to receive 1,000 times the amount and type of
consideration received per share of Common Stock. The rights of the Preferred
Stock as to dividends, liquidation and voting, and in the event of mergers and
consolidations, are protected by customary antidilution provisions. Fractional
shares of Preferred Stock will be issuable; however, (i) the Company may elect
to distribute depositary receipts in lieu of such fractional shares and (ii) in
lieu of fractional shares other




                                      -4-
<PAGE>   5
than fractions that are multiples of one one-thousandth of a share, 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.

        Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends. The Company and the Rights Agent retain broad
authority to amend the Rights Agreement; however, following any Distribution
Date any amendment may not adversely affect the interests of holders of Rights.

        A copy of the Rights Agreement is attached as an exhibit to this
Registration Statement on Form 8-A. 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.


Item 2.  Ehibits.

The following exhibits are filed as a part of this Registration Statement:

4.1      Rights Agreement dated as of October 22, 1997 between Biosite
         Diagnostics Incorporated and BankBoston, N.A. which includes as Exhibit
         B the form of Rights Certificate. Pursuant to the Rights Agreement,
         Rights Certificates will not be mailed until the earlier of (i) a
         public announcement that a person or a group of affiliated or
         associated persons has acquired beneficial ownership of securities
         representing 15% or more of the outstanding common stock or (ii) ten
         days after a person or a group of affiliated or associated persons has
         commenced or announced an intent to commence a tender offer or exchange
         offer which, upon consummation thereof, would cause such person or
         group to own beneficially securities representing 15% or more of the
         outstanding common stock.







                                      -5-
<PAGE>   6
                                    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, thereto duly authorized.


Dated:  October 24, 1997               BIOSITE DIAGNOSTICS INCORPORATED


                                       By:  /s/ CHRISTOPHER J. TWOMEY
                                          --------------------------------------
                                            Christopher J. Twomey
                                            Vice President, Finance and
                                            Chief Financial Officer





                                      -6-
<PAGE>   7
                                  EXHIBIT INDEX



<TABLE>
<CAPTION>
Exhibit
Number     EXHIBIT
- -------    -------
<S>        <C>
   4.1     Rights Agreement dated as of October 22, 1997 between Biosite
           Diagnostics Incorporated and BankBoston, N.A. which includes as
           Exhibit B the form of Rights Certificate. Pursuant to the Rights
           Agreement, Rights Certificates will not be mailed until the earlier
           of (i) a public announcement that a person or a group of affiliated
           or associated persons has acquired beneficial ownership of securities
           representing 15% or more of the outstanding common stock or (ii) ten
           days after a person or a group of affiliated or associated persons
           has commenced or announced an intent to commence a tender offer or
           exchange offer which, upon consummation thereof, would cause such
           person or group to own beneficially securities representing 15% or
           more of the outstanding common stock.
</TABLE>






                                      -7-

<PAGE>   1
                                                                     EXHIBIT 4.1



                                                                  EXECUTION COPY

================================================================================











                        BIOSITE DIAGNOSTICS INCORPORATED


                                       and


                                BANKBOSTON, N.A.



                                  Rights Agent


                                  ------------



                                RIGHTS AGREEMENT



                          Dated as of October 22, 1997









================================================================================



<PAGE>   2
                                TABLE OF CONTENTS


<TABLE>
<CAPTION>

                                                                                         Page
                                                                                         ----
<S>     <C>                                                                                <C>
1.      Certain Definitions.................................................................1

2.      Appointment of Rights Agent.........................................................4

3.      Issue of Rights Certificates........................................................5

4.      Form of Rights Certificates.........................................................6

5.      Countersignature and Registration...................................................7

6.      Transfer, Split Up, Combination and Exchange of
        Rights Certificates; Mutilated, Destroyed, Lost or
        Stolen Rights Certificates..........................................................8

7.      Exercise of Rights; Purchase Price; Expiration
        Date of Rights......................................................................9

8.      Cancellation and Destruction of Rights Certifi
        cates............................................................................. 11

9.      Reservation and Availability of Preferred Stock................................... 11

10.     Preferred Stock Record Date....................................................... 12

11.     Adjustment of Purchase Price, Number and Kind of
        Shares or Number of Rights........................................................ 13

12.     Certificate of Adjusted Purchase Price or Number
        of Shares......................................................................... 22

13.     Consolidation, Merger or Sale or Transfer of
        Assets or Earning Power........................................................... 22

14.     Additional Covenants.............................................................. 25

15.     Fractional Rights and Fractional Shares........................................... 26

16.     Rights of Action.................................................................. 27

17.     Agreement of Rights Holders....................................................... 28

18.     Rights Certificate Holder Not Deemed a Stockholder................................ 28

19.     Concerning the Rights Agent....................................................... 29

20.     Merger or Consolidation or Change of Name of
        Rights Agent...................................................................... 29

21.     Duties of Rights Agent............................................................ 30

22.     Change of Rights Agent............................................................ 33
</TABLE>




                                      -i-

<PAGE>   3
<TABLE>
<CAPTION>

                                                                                         Page
                                                                                         ----
<S>     <C>                                                                                <C>
23.     Issuance of New Rights Certificates............................................... 34

24.     Redemption, Termination and Exchange.............................................. 34

25.     Notice of Certain Events.......................................................... 37

26.     Notices........................................................................... 38

27.     Supplements and Amendments........................................................ 39

28.     Determination and Actions by the Board of
        Directors, etc.................................................................... 39

29.     Successors........................................................................ 40

30.     Benefits of This Agreement........................................................ 40

31.     Severability...................................................................... 40

32.     Governing Law..................................................................... 40

33.     Counterparts...................................................................... 40

34.     Descriptive Headings.............................................................. 40


Exhibit A --             Certificate of Designation,
                         Rights and Preferences of Series A
                         Participating Preferred Stock .......                            A-1

Exhibit B --             Form of Rights Certificate ..........                            B-1

Exhibit C --             Form of Summary of Rights ...........                            C-1
</TABLE>




                                      -ii-
<PAGE>   4
                                RIGHTS AGREEMENT


        THIS AGREEMENT is dated as of October 22, 1997 between BIOSITE
DIAGNOSTICS INCORPORATED, a Delaware corporation (the "Company"), and
BANKBOSTON, N.A., a national banking association (the "Rights Agent").

                                    W I T N E S S E T H:

        WHEREAS, on October 22, 1997, the Board of Directors of the Company
authorized and declared a dividend distribution of one Right (as hereinafter
defined) for each share of Common Stock, $0.01 par value per share, of the
Company (the "Common Stock") outstanding as of the close of business on November
3, 1997 (the "Record Date"), and contemplates the issuance of one Right (subject
to adjustment as provided herein) for each share of Common Stock of the Company
issued between the Record Date and the earlier of the Distribution Date and the
Expiration Date, as such terms are hereinafter defined (with Rights also to be
issued in connection with certain issuances of Common Stock after the
Distribution Date, as provided more fully herein), each Right representing the
right to purchase one one-thousandth of a share of Series A Participating
Preferred Stock of the Company having the rights, powers and preferences set
forth in the form of Certificate of Designation, Rights and Preferences 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 hereto hereby agree as follows:

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

               (a) "Acquiring Person" shall mean any Person (as such term is
        hereinafter defined) who or which, together with all Affiliates (as such
        term is here inafter defined) and Associates (as such term is
        hereinafter defined) of such Person, shall be the Beneficial Owner (as
        such term is hereinafter defined) of securities representing 15% or more
        of the shares of Common Stock then outstanding or who was such a
        Beneficial Owner at any time after the date hereof, whether or not such
        Person continues to be the Benefi cial Owner of securities representing
        15% or more of the outstanding shares of Common Stock. Notwithstand ing
        the foregoing, (i) in no event shall a Person who or which, together
        with all Affiliates and Associates of such Person, is the Beneficial
        Owner of less than 15% of the Company's outstanding shares of Common
        Stock become an Acquiring Person solely as a result of a reduction of
        the number of shares of outstanding




                                      -1-
<PAGE>   5
        Common Stock, including repurchases of outstanding shares of Common
        Stock by the Company, which reduction increases the percentage of
        outstanding shares of Common Stock beneficially owned by such Person
        (provided that any subsequent increase in the amount of Common Stock
        beneficially owned by such Person, together with all Affiliates and
        Associates of such Person, without the prior approval of the Company
        shall cause such Person to be an Acquiring Person); (ii) the term
        Acquiring Person shall not mean (A) the Company, (B) any subsidiary of
        the Company (as such term is hereinafter defined), (C) any employee
        benefit plan of the Company or any of its subsidiaries, or (D) any
        entity holding securities of the Company organized, appointed or
        established by the Company or any of its subsidiaries for or pursuant to
        the terms of any such plan; and (iii) no Person shall be deemed to be an
        Acquiring Person if (A) within five business days after such Person
        would otherwise have become an Acquiring Person (but for the operation
        of this clause (iii), such Person notifies the Board of Direc tors that
        such Person did so inadvertently and within two business days after such
        notification, such Person is the Beneficial Owner of less than 15% of
        the outstanding shares of Common Stock, (B) by reason of such Person's
        Beneficial Ownership of 15% or more of the outstanding shares of Common
        Stock on the date hereof if prior to the Record Date, such Person
        notifies the Board of Directors that such Person is no longer the
        Beneficial Owner of 15% or more of the then outstanding shares of Common
        Stock or (C) if the Board of Directors determines in good faith that a
        Person who would otherwise be an "Acquiring Person," as defined pursuant
        to the foregoing provisions of this paragraph (a), has become such
        inadvertently, and such Person divests as promptly as practicable a
        sufficient number of Common Stock so that such Person would no longer be
        an "Acquiring Person," as defined pursuant to the foregoing provisions
        of this paragraph (a).

               (b) "Affiliate" and "Associate" shall have the respective
        meanings ascribed to such terms in Rule 12b-2 of the General Rules and
        Regulations under the Securities Exchange Act of 1934, as amended (the
        "Exchange Act"), as 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 beneficially owns, directly or indirectly;




                                      -2-
<PAGE>   6
                      (ii) which such Person or any of such Person's Affiliates
               or Associates has (A) the right or obligation to acquire (whether
               such right or obligation is exercisable or effective immediately
               or only after the passage of time) pursuant to any agreement,
               arrangement or under standing (whether or not in writing) (other
               than customary agreements with and between underwriters and
               selling group members with respect to a bona fide public offering
               of securities) or upon the exercise of conversion rights,
               exchange rights, rights (other than the Rights), warrants or
               options, or otherwise; provided, however, that a Person shall not
               be deemed the "Beneficial Owner" of, or to "beneficially own,"
               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 payment or
               exchange; or (B) the right to vote pursuant to any agreement,
               arrangement or under standing (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 clause (B) if the agree ment, arrangement or
               understanding to vote such security (1) arises solely from a
               revocable proxy given in response to a public proxy or consent
               solicitation made pursuant to, and in accordance with, the
               applicable rules and regulations of the Exchange Act and (2) is
               not also 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) (other than customary
               agreements with and between underwriters and selling group
               members with respect to a bona fide public offering of
               securities), or with which such Person or any of such Person's
               Affiliates have otherwise formed a group, for the purpose of
               acquiring, holding, voting (except pursuant to a revocable proxy
               as described in clause (B) of subparagraph (ii) of this paragraph
               (c)) or disposing of any securities of the company.

               (d) "Business Day" shall mean any day other than a Saturday,
        Sunday, or a day on which banking institu-




                                      -3-
<PAGE>   7
        tions in the State of California are authorized or
        obligated by law or executive order to close.

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

               (f) "Common Stock" shall mean the Common Stock, $0.01 par value,
        of the Company, except that "Common Stock" when used with reference to
        stock issued by any Person other than the Company shall mean the capital
        stock with the greatest voting power, or the equity securities or other
        equity interest having power to control or direct the management, of
        such Person or, if such Person is a subsidiary of another Person, of the
        Person which ultimately controls such first-mentioned Person and which
        has issued and outstanding such capital stock, equity securities or
        equity interests.

               (g) "Person" shall mean any individual, firm, corporation,
        partnership, joint venture, association, trust or other entity.

               (h) "Preferred Stock" shall mean the Series A Participating
        Preferred Stock, $0.01 par value, of the Company.

               (i) "Stock Acquisition Date" shall mean the first date of public
        announcement by the Company or an Acquiring Person that an Acquiring
        Person has become such.

               (j) A "subsidiary" of any Person shall mean any corporation or
        other entity of which a majority of the voting power of the voting
        equity securities or voting interests is owned, directly or indirectly,
        by such Person, or which is otherwise controlled by such Person.

               (k) "Voting power" shall mean the voting power of all securities
        of the Company then outstanding and generally entitled to vote for the
        election of direc tors of the Company.

        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




                                      -4-
<PAGE>   8
as it may deem necessary or desirable upon ten days' prior written notice to the
Rights Agent. The Rights Agent shall have no duty to supervise, and shall in no
event be liable for, the acts or omissions of any such Co-Rights Agent. In the
event the Company appoints one or more Co-Rights Agents, the respective duties
of the Rights Agents and any Co-Rights Agents shall be as the Company shall
determine.

        3. Issue of Rights Certificates.

        (a) Until the earlier of (i) the Stock Acquisition Date or (ii) the
tenth day after the date of the commencement of, or first public announcement of
the intent of any Person (other than the Company, any subsidiary of the Company,
or any employee benefit plan of the Company or any of its subsidiaries) to
commence (which intention to commence remains in effect for five Business Days
after such announcement), a tender or exchange offer which would result in such
Person becoming an Acquiring Person, unless such date is extended by the Board
of Directors of the Company (including any such date which is on or after the
date of this Agreement and prior to the issuance of the Rights;
the earlier of such dates being herein referred to as the "Distribution Date"),
(x) the Rights shall be evidenced (subject to the provisions of paragraph (b) of
this Section 3) by the certificates for 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 (and the right to receive certificates therefor) shall be
transferable only in connection with the transfer of the underlying shares of
Common Stock. As soon as practicable after the Distribution Date, the Rights
Agent shall 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, a certificate
for Rights, in substantially the form of Exhibit B hereto (the "Rights
Certificates"), evidencing one Right for each share of Common Stock so held. As
of and after the Distribution Date, the Rights shall be evidenced solely by such
Rights Certifi cates.

        As soon as practicable following the Record Date, the Company shall send
a copy of a Summary of Rights, in substan tially 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 (or earlier redemption, expiration or termination of
the Rights), the Rights shall be evidenced by such certificates for the Common
Stock together with the Summary of Rights and the registered holders of the
Common Stock shall also be the registered holders of the associated Rights.
Until the Distri-




                                      -5-
<PAGE>   9
bution Date (or earlier redemption, expiration or termination of the Rights),
the surrender for transfer of any of the certifi cates for the Common Stock
outstanding on the Record Date, even without a copy of the Summary of Rights
attached thereto, shall also constitute the transfer of the Rights associated
with the Common Stock represented by such certificate.

        (b) Certificates issued for Common Stock (including, without limitation,
certificates issued upon transfer or exchange of Common Stock) after the Record
Date, but prior to the earlier of the Distribution Date or the Expiration Date
(as such term is hereinafter defined), shall be deemed also to be certificates
for Rights, and shall have impressed, printed, stamped, written or otherwise
affixed onto them the following legend:

               This certificate also evidences and entitles the holder hereof to
        certain Rights as set forth in a Rights Agreement between Biosite
        Diagnostics Incorporated (the "Company") and BankBoston, N.A. (the
        "Rights Agent") dated as of October 22, 1997 (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 the Company. Under
        certain circumstances, as set forth in the Rights Agreement, such Rights
        may be redeemed, may expire, or may be evidenced by separate
        Certificates and will no longer be evidenced by this Certificate. The
        Company will mail to the holder of this certificate a copy of the Rights
        Agreement without charge within five days after receipt of a written
        request therefor. Under certain circumstances, Rights issued to
        Acquiring Persons (as defined in the Rights Agreement) or certain
        related Persons and any subse quent holder of such Rights may become
        null and void.

With respect to such certificates containing the foregoing legend, until the
Distribution Date (or earlier redemption, expiration or termination of the
Rights), the Rights associated with the Common Stock represented by such
certificates shall be evidenced by such certificates alone, and the surrender
for transfer of any of such certificates shall also constitute the transfer of
the Rights associated with the Common Stock repre sented by such certificate.

        4. Form of Rights Certificates.

        (a) The Rights Certificates (and the forms of election to purchase
shares and of assignment and certificates 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 identi fication or designation and such legends, summaries or
endorse ments printed thereon as the Company may deem appropriate and as are not
inconsistent with the provisions of this Agreement, or




                                      -6-
<PAGE>   10
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 23 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 per one one-thousandth of a share set forth therein (the "Purchase
Price"), but the number of such shares and the Purchase Price shall be subject
to adjustment as provided herein.

        (b) Any Rights Certificate issued pursuant to Section 3(a) hereof that
represents Rights beneficially owned by an Acquiring Person or any Associate or
Affiliate thereof and any Rights Certificate issued at any time upon the
transfer of any Rights to such an Acquiring Person or any Associate or Affiliate
thereof or to any nominee of such Acquiring Person, Associate or Affiliate, and
any Rights Certificate issued pursuant to Section 6 or Section 11 upon transfer,
exchange, replacement or adjustment of any other Rights Certificate referred to
in this sentence, shall contain the following legend:

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

The provisions of Section 7(e) of this Rights Agreement shall be operative
whether or not the foregoing legend is contained on any such Rights Certificate.

        5. Countersignature and Registration. The Rights Certificates shall be
executed on behalf of the Company by its Chairman of the Board, any Vice
Chairman of the Board, 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 counter signed 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




                                      -7-
<PAGE>   11
Company; and any Rights Certificates may be signed on behalf of the Company by
any Person who, at the actual date of the execu tion 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.

        Following the Distribution Date, the Rights Agent will keep or cause to
be kept, at its office designated for such purpose, 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 Certifi cates and
the date of each of the Rights Certificates.

        6. Transfer, Split Up, Combination and Exchange of Rights Certificates;
Mutilated, Destroyed, Lost or Stolen Rights Certificates. Subject to the
provisions of Section 15 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 Rights Certificates,
entitling the registered holder to purchase a like number of shares of Preferred
Stock as the Rights Certificate or Rights Certificates surrendered then entitled
such holder to purchase. Any registered holder desiring to transfer, split up,
combine or exchange any Rights Certificate shall make such request in writing
delivered to the Rights Agent, and shall surrender the Rights Certificate or
Rights Certificates to be transferred, split up, combined or exchanged at the
principal office of the Rights Agent. There upon the Rights Agent shall
countersign and deliver to the Person entitled thereto a Rights Certificate or
Rights Certifi cates, as the case may be, as so requested. The Company may
require payment of a sum sufficient to cover any tax or govern mental charge
that may be imposed in connection with any transfer, split up, combination or
exchange of Rights Certifi cates.

        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 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, and, in case of loss, theft or destruction, of
indemnity or security reasonably satis factory 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 shall 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.




                                      -8-
<PAGE>   12
        7. Exercise of Rights; Purchase Price; Expiration Date of Rights.

        (a) The registered holder of any Rights Certificate may exercise the
Rights evidenced thereby (except as otherwise provided herein) in whole or in
part at any time after the Distribution Date upon presentation of the Rights
Certificate, with the appropriate form of election to purchase on the reverse
side thereof duly executed, to the Rights Agent at the principal office of the
Rights Agent, together with payment of the Purchase Price for each one
one-thousandth of a share of Preferred Stock (or such other number of shares or
other securi ties) as to which the Rights are exercised, at or prior to the
earliest of (i) the close of business on October 22, 2007 (the "Final Expiration
Date"), (ii) the time at which the Rights are redeemed as provided in Section 24
hereof, (iii) the consummation of a transaction contemplated by Section 13(d)
hereof or (iv) the time at which the Rights are exchanged as provided in Section
24(c) hereof (such earliest time being herein referred to as the "Expiration
Date"). Notwithstanding any other provision of this Agreement, any Person who
prior to the Distribution Date becomes a record holder of shares of Common Stock
may exercise all of the rights of a registered holder of a Rights Certificate
with respect to the Rights associated with such shares of Common Stock in
accordance with and subject to the provisions of this Agreement, including the
provisions of Section 7(e) hereof, as of the date such Person becomes a record
holder of shares of Common Stock.

        (b) The Purchase Price for each one one-thousandth share of Preferred
Stock pursuant to the exercise of a Right shall initially be $50.00, shall be
subject to adjustment from time to time as provided in Sections 11 and 13 hereof
and shall be payable in lawful money of the United States of America in
accordance with paragraph (c) below.

        (c) Upon receipt of a Rights Certificate representing exercisable
Rights, with the appropriate form of election to purchase duly executed,
accompanied by payment of the Purchase Price for the shares (or other securities
or property) to be purchased and an amount equal to any applicable transfer tax
(as determined by the Rights Agent) in the form of certified check or bank draft
payable to the order of the Company, the Rights Agent shall, subject to Section
21(k), 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) certificates for the number of shares of Preferred Stock to be
purchased, and the Company hereby irrevo cably authorizes its transfer agent to
comply with all such requests, or (B) if the Company, in its sole discretion,
shall have elected to deposit the shares of Preferred Stock issuable upon
exercise of the Rights hereunder into a depositary, requi sition from the
depositary agent depositary receipts represent ing such number of one
one-thousandths of a share of Preferred




                                      -9-
<PAGE>   13
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 shall direct the depositary
agent to comply with such request, (ii) when appropriate, requisition from the
Company the amount of cash, if any, to be paid in lieu of issuance of fractional
shares in accordance with Section 15, (iii) promptly 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) when
appropriate, after receipt promptly deliver such cash to or upon the order of
the registered holder of such Rights Certificate. In the event that the Company
is obligated to issue other securities of the Company, and/or distribute other
property pursuant to Section 11(a), the Company shall make all arrangements
necessary so that such other securities and/or property are available for
distribution by the Rights Agent, if and when appropriate. In addition, in the
case of an exercise of the Rights by a holder pursuant to Section 11(a)(ii), the
Rights Agent shall return such Rights Certificate to the regis tered holder
thereof after imprinting, stamping or otherwise indicating thereon that the
rights represented by such Rights Certificate no longer include the rights
provided by Section 11(a)(ii) of the Rights Agreement and if less than all the
Rights represented by such Rights Certificate were so exercised, the Rights
Agent shall indicate on the Rights Certificate the number of Rights represented
thereby which continue to include the rights provided by Section 11(a)(ii).

        (d) In case the registered holder of any Rights Certifi cate shall
exercise (except pursuant to Section 11(a)(ii)) 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 the regis tered holder of such Rights Certificate or to such holder's duly
authorized assigns, subject to the provisions of Section 15 hereof.

        (e) Notwithstanding anything in this Agreement to the contrary, if there
occurs any of the events set forth in Section 11(a)(ii) or Section 13(a) then
any Rights that are or were on or after the Distribution Date beneficially owned
by an Acquir ing Person or any Associate or Affiliate of an Acquiring Person
shall become null and void, without any further action, and any holder of such
Rights shall thereafter have no rights whatsoever with respect to such Rights,
whether under any provision of this Agreement or otherwise.

        (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 the certificate contained in the




                                      -10-
<PAGE>   14
appropriate form of election to purchase set forth on the reverse side of the
Rights Certificate surrendered for such exercise shall have been properly
completed and duly executed by the registered holder thereof and the Company
shall have been provided with 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.

        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 Rights 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.

        9. Reservation and Availability of Preferred Stock. The Company
covenants and agrees that it shall cause to be reserved and kept available out
of its authorized and unissued shares of Preferred Stock, or any authorized and
issued shares of Preferred Stock held in its treasury, the number of shares of
Preferred Stock that will be sufficient to permit the exercise in full of all
outstanding Rights and, after the occurrence of an event specified in Sections
11 and 13, shall so reserve and keep available a sufficient number of shares of
Common Stock (and/or other securities) which may be required to permit the
exercise in full of the Rights pursuant to this Agreement.

        So long as the shares of Preferred Stock (and, after the occurrence of
an event specified in Section 11 and 13, any other securities) issuable 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 (or other securities) reserved for such
issuance to be listed on such exchange upon official notice of issuance upon
such exercise.

        The Company covenants and agrees that it shall take all such action as
may be necessary to ensure that all shares of Preferred Stock and/or other
securities delivered upon exercise of Rights shall, at the time of delivery of
the certificates for such shares or other securities (subject to payment of the
Purchase Price), be duly and validly authorized and issued and fully paid and
nonassessable shares or securities.




                                      -11-
<PAGE>   15
        The Company further covenants and agrees that it shall 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 or of
any certificates for shares of Preferred Stock and/or other securi ties 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 in respect of the issuance or
delivery of the shares of Preferred Stock and/or other securities in 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
shares of Preferred Stock, and/or other securities 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.

        The Company shall use its best efforts to (i) file, if required by law,
as soon as practicable following the Distribu tion Date, a registration
statement under the Securities Act of 1933, as amended (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 and the rules and regulations thereunder) until the Expiration Date (unless
and until the Company shall have received an opinion of counsel to the effect
that the maintenance of such registration statement in effect is no longer
necessary). The Company will also take such action as may be appropriate under
the blue sky laws of the various states.

        10. Preferred Stock Record Date. Each Person in whose name any
certificate for shares of Preferred Stock (or other securities) is issued upon
the exercise of Rights shall for all purposes be deemed to have become the
holder of record of the shares of Preferred Stock (or other securities)
represented thereby on, and such certificate shall be dated, the date upon which
the Rights Certificate evidencing such Rights was duly presented and payment of
the Purchase Price (and any applicable transfer taxes) was made; provided,
however, that if the date of such presentation and payment is a date upon which
the Preferred Stock (or other securities) transfer books of the Company are
closed, such Person shall be deemed to have become the record holder of such
shares on, and such certificate shall be dated, the next succeeding Business Day
on which the Preferred Stock (or other securities) transfer books of the Company
are open. Prior to the exercise of the Rights evidenced thereby, the holder of a
Rights Certificate, as such, shall not be entitled to any rights of a
stockholder of the Company with respect 




                                      -12-
<PAGE>   16
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.

        11. Adjustment of Purchase Price, Number and Kind of Shares or Number of
Rights. The Purchase Price, the number of shares covered by each Right and the
number of Rights outstand ing 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 reclassifica
        tion 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 in Section 7(e), 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 capital stock issuable on such date,
        shall be proportionately adjusted so that the holder of any Right
        exercised after such time shall be entitled to receive the aggregate
        number and kind of shares of capital stock and other securities 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,
        such holder 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 Section 11(a)(i) and Section 11(a)(ii), 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).

               (ii) Subject to Section 24(c) of this Agreement, in the event any
        Person, alone or together with its Affiliates and Associates, shall
        become an Acquiring Person (except pursuant to a tender or exchange
        offer for all outstanding shares of Common Stock at a price and on terms
        determined prior to the date of the first acceptance of payment for any
        of such shares by at least a majority of the members of the Board of
        Direc tors who are not officers of the Company and are not
        Acquiring Persons or Affiliates or Associates thereof 




                                      -13-
<PAGE>   17
        to be in the best interests of the Company and its stockholders (other
        than the Person or an Affiliate or Associate thereof on whose behalf the
        offer is being made) (a "Permitted Offer")), then, promptly following
        the first occurrence of an event described in this Section 11(a)(ii),
        proper provision shall be made so that each holder of a Right, except as
        provided in Section 7(e) hereof, shall, for a period of 60 days after
        the later of the occurrence of any such event and the effective date of
        an appropriate registration statement pursuant to Section 9, have a
        right to receive, upon exercise thereof at the then current Purchase
        Price in accordance with the terms of this Agreement, in lieu of shares
        of Preferred Stock, such number of shares of Common Stock 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 is then exercisable and (y) dividing
        that product by 50% of the current market price per one share of Common
        Stock (determined pursuant to Sec tion 11(d)) on the date of the
        occurrence of the event set forth in this subparagraph (ii) (such number
        of shares being referred to as the "number of Adjustment Shares");
        provided, however, that if the transaction that would otherwise give
        rise to the foregoing adjustment is also subject to the provisions of
        Section 13 hereof, then only the provisions of Section 13 hereof shall
        apply and no adjustment shall be made pursuant to this Section
        11(a)(ii); and provided, further, that such 60-day period shall not be
        deemed to run during any period in which the exer cise of the Rights or
        the fulfillment by the Company or the Rights Agent of its or their
        obligations under their Agreement shall be enjoined or otherwise
        prohibited in full or in part by any court or other governmental agency
        or body.

               (iii) In lieu of issuing shares of Common Stock in accordance
        with Section 11(a)(ii) hereof, the Company may, if a majority of the
        Board of Directors then in office determines that such action is neces
        sary or appropriate and not contrary to the interests of holders of
        Rights, elect to (and, in the event that the Board of Directors has not
        exercised the exchange right contained in Section 24(c) hereof and there
        are not sufficient treasury shares and authorized but unissued shares of
        Common Stock to permit the exercise in full of the Rights in accordance
        with the foregoing subparagraph (ii), the Company shall) take all such
        action as may be necessary to authorize, issue or pay, upon the exercise
        of the Rights, cash (including by way of a reduction of the Purchase
        Price), property, shares of Common Stock, other securities or any 




                                      -14-
<PAGE>   18
        combination thereof having an aggregate value equal to the value of the
        shares of Common Stock which other wise would have been issuable
        pursuant to Section 11(a)(ii), which aggregate value shall be determined
        by a nationally recognized investment banking firm selected by a
        majority of the Board of Directors. For purposes of the preceding
        sentence, the value of the Common Stock shall be determined pursuant to
        Sec tion 11(d) hereof and the value of any preferred stock or preference
        stock which a majority of the Board of Directors determines to be a
        "common stock equivalent" shall be deemed to have the same value as the
        Common Stock. Any such election by the Board of Directors must be made
        and publicly announced within 60 days following the date on which the
        event described in Section 11(a)(ii) shall have occurred. Following the
        occurrence of the event described in Section 11(a)(ii) hereof, a
        majority of the Board of Directors then in office may suspend the
        exercisability of the Rights for a period of up to 60 days following the
        date on which the event described in Section 11(a)(ii) shall have
        occurred to the extent that such directors have not determined whether
        to exercise their rights of election under this Section 11(a)(iii). 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.

               (b) If the Company shall fix a record date for the issuance of
        rights, options or warrants to all holders of Preferred Stock entitling
        them (for a period expiring within 45 calendar days after such record
        date) to subscribe for or purchase Preferred Stock (or shares having the
        same or more favorable rights, privileges and preferences as the
        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 defined in Section 11(d)) 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 to be offered
        (and/or the aggregate initial conversion price of the convertible
        securities so to be offered) 




                                      -15-
<PAGE>   19
        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 conver tible securities so to be offered are
        initially convertible). In case such subscription price may be paid in a
        consideration part or all of which shall be in a form other than cash,
        the value of such consideration shall be determined reasonably and with
        good faith to the holders of Rights 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
        conclu sive for all purposes. 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 succes
        sively 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) If the Company shall fix a record date for the making of 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)), 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
        defined in Section 11(d)) per share of Preferred Stock on such record
        date, less the fair market value (as determined reasonably and with good
        faith to the holders of Rights 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 conclusive for
        all purposes) of the portion of the cash, assets or evidences of
        indebtedness so to be distributed or of such subscription rights or
        warrants distributable in respect of one share of Preferred Stock and
        the denominator of which shall be the current market price (as defined
        in Section 11(d))




                                      -16-
<PAGE>   20
        per share of the 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 again be
        adjusted to be the Purchase Price which would be in effect if such
        record date had not been fixed.

        (d) (i) For the purpose of any computation hereunder, other than in
        Section 11(a)(iii), the "current market price" per share of Common Stock
        on any date shall be deemed to be the average of the daily closing
        prices per share of such Common Stock for the 30 consecutive Trading
        Days (as such term is hereinafter defined) immediately prior to such
        date; provided, however, that in the event that the current per share
        market price of the Common Stock is deter mined during a period
        following the announcement by the issuer of such Common Stock of (A) a
        dividend or distribution on such Common Stock payable in shares of such
        Common Stock or securities convertible into shares of such Common Stock
        or (B) any subdivision, combination or reclassification of such Common
        Stock, and prior to the expiration of 30 Trading Days after the
        ex-dividend date for such dividend or distri bution, or the record date
        for such subdivision, combination or reclassification, 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 shares of
        Common Stock 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 shares of Common Stock are
        listed or admitted to trading or, if the shares of Common Stock are not
        listed or admitted to trading on any national securi ties 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 shares of
        Common Stock 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 Stock selected by the Board of Directors
        of the Company. If on any such date no market maker is making a market
        in the Common Stock, the fair value of such shares on such date as




                                      -17-
<PAGE>   21
        determined reasonably and with good faith by the Board of Directors of
        the Company shall be used and shall be binding on the Rights Agent. The
        term "Trading Day" shall mean a day on which the principal national
        securities exchange on which the shares of Common Stock are listed or
        admitted to trading is open for the transaction of business or, if the
        shares of Common Stock are not listed or admitted to trading on any
        national securities exchange, a Business Day. If the Common Stock is not
        publicly held or not so listed or traded, "current market price" per
        share shall mean the fair value per share determined reasonably and with
        good faith to the holders of Rights 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.

               (ii) For the purpose of any computation here under, the "current
        market price" per share (or one one-thousandth of a share) of Preferred
        Stock shall be determined in the same manner as set forth above for the
        Common Stock in Section 11(d) (other than the last sentence thereof). If
        the current market price per share (or one one-thousandth of a 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 Section 11(d)(i), 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 appropri ately adjusted for such events as
        stock splits, stock dividends and recapitalization with respect to the
        Common Stock occurring after the date of this Agree ment) multiplied by
        the current market price per share of the Common Stock and the "current
        market price" per one one-thousandth of a share of Preferred Stock shall
        be equal to the current market price per share of the Common Stock (as
        appropriately adjusted). If neither the Common Stock nor the Preferred
        Stock is publicly held or so listed or traded, "current market price"
        per share shall mean the fair value per share 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 conclusive for all purposes.

               (e) Anything herein to the contrary notwith standing, no
        adjustment in the Purchase Price shall be required unless such
        adjustment would require an increase or decrease of at least 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




                                      -18-
<PAGE>   22
        this Section 11 shall be made to the nearest cent or to the nearest
        thousandth of a share of Common Stock or other share or one millionth of
        a share of Preferred Stock, as the case may be. Notwithstanding the
        first sentence of this Section 11(e), any adjust ment required by this
        Section 11 shall be made no later than the earlier of (i) three years
        from the date of the transaction which mandates such adjustment or (ii)
        the Expiration Date.

               (f) If as a result of any provision of Section 11(a), the holder
        of any Right thereafter exercised shall become entitled to receive any
        shares of capital stock of the Company other than Preferred Stock,
        thereafter the number of such other shares so receiv able upon exercise
        of any Right 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 shares contained in Section 11(a) through
        (c), inclusive, and the provisions of Sections 7, 9, 10, 13 and 15
        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 shares 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 Section 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 millionth) obtained by (i) multiplying
        (x) the number of one one-thousandths of a share of Preferred Stock
        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 substitution
        for any adjustment in the number of shares of Preferred Stock
        purchasable 




                                      -19-
<PAGE>   23
        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 millionth) 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 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 15
        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 shares of Preferred Stock issuable upon the
        exercise of the Rights, the Rights Certificates theretofore and there
        after issued may continue to express the Purchase Price per share and
        the number of shares 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 




                                      -20-
<PAGE>   24
        par value, if any, of the shares of Preferred Stock, Common Stock or
        other securities issuable upon exer cise 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 shares of Preferred Stock, Common
        Stock or other securities at such adjusted Purchase Price. If upon any
        exercise of the Rights, a holder is to receive a combination of Common
        Stock and common stock equiva lents, a portion of the consideration paid
        upon such exercise, equal to at least the then par value of a share of
        Common Stock of the Company, shall be allocated as the payment for each
        share of Common Stock of the Company so received.

               (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 occur
        rence of such event the issuing to the holder of any Right exercised
        after such record date the shares of Preferred Stock and other capital
        stock or securities of the Company, if any, issuable upon such exercise
        over and above the shares 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 upon the occurrence of the event
        requiring such adjustment.

               (m) Anything to the contrary in this Section 11 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 it in its sole discre tion shall
        determine to be advisable in order that any consolidation or subdivision
        of the Preferred Stock, issuance wholly for cash of any shares of
        Preferred Stock at less than the current market price, 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,
        stock dividends or issuance of rights, options or warrants referred to
        hereinabove in this Section 11, hereafter made by the Company to holders
        of its Preferred Stock shall not be taxable to such stockholders.

                      (n) Anything in this Agreement to the contrary
        notwithstanding, in the event that the Company shall at any time after
        the date of this Agreement and prior 




                                      -21-
<PAGE>   25
        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 Common Stock, (iii) combine the outstanding Common Stock
        into a smaller number of shares, or (iv) issue any shares of its capital
        stock in a reclassification of the outstanding Common Stock, the number
        of Rights associ ated 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 immedi ately 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.

               (o) The exercise of Rights under Section 11(a)(ii) shall only
        result in the loss of rights under Section 11(a)(ii) to the extent so
        exercised and shall not otherwise affect the rights represented by the
        Rights under this Rights Agreement, including the rights represented by
        Section 13.

        12. Certificate of Adjusted Purchase Price or Number of Shares. Whenever
an adjustment is made as provided in Sections 11 and 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 a brief summary thereof
to each holder of a Rights Certificate in accordance with Section 26 hereof. The
Rights Agent shall be fully protected in relying on any such certificate and on
any adjustment therein contained and shall not be deemed to have knowledge of
any adjustment unless and until it shall have received such certificate.

        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, (y) any Person shall consolidate with the Company, or merge with
and into the Company and the Company shall be the continuing or surviving
corporation of such merger (other than, in the case of either transaction
described in (x) or (y), a merger or consolidation which would result in all of
the voting power represented by the 




                                      -22-
<PAGE>   26
securities of the Company outstanding immediately prior thereto continuing to
represent (either by remaining outstanding or by being converted into securities
of the surviving entity) all of the voting power represented by the securities
of the Company or such surviving entity outstanding immediately after such
merger or consolidation and the holders of such securities not having changed as
a result of such merger or consolidation), or (z) the Company shall sell,
mortgage or otherwise transfer (or one or more of its subsidiaries shall sell,
mortgage or otherwise transfer), in one or more 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, then, and in each
such case, proper provision shall be made so that (i) following the Distribution
Date, each holder of a Right (other than as provided in Section 7(e) hereof)
shall 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
shares of freely tradable Common Stock of the Principal Party (as hereinafter
defined), free and clear of liens, rights of call or first refusal, encumbrances
or other adverse claims, as shall be equal to the result obtained by (x)
multiplying the then current Purchase Price by the number of one one-thousandths
of a share of Preferred Stock for which a Right is then exercisable (without
taking into account any adjustment previously made pursuant to Section 11(a)(ii)
hereof) and (y) dividing that product by 50% of the current market price per
share of the Common Stock of such Principal Party (deter mined pursuant to
Section 11(d) hereof) on the date of consumma tion of such consolidation,
merger, sale or transfer; (ii) such Principal Party shall thereafter be liable
for, and shall assume, by virtue of such consolidation, merger, sale or
transfer, 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 to such Principal Party; and (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 accordance with Section 9
hereof) in connection with such consummation 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.

        (b) "Principal Party" shall mean:

               (i) in the case of any transaction described in (x) or (y) of the
        first sentence of this Section 13, 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 the merger or
        consolidation (including, if




                                      -23-
<PAGE>   27
        applicable, the Company, if it is the surviving corporation); and

               (ii) in the case of any transaction described in (z) of the first
        sentence in this Section 13, 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 12-month period registered under Section 12 of the Exchange
        Act, and such Person is a direct or indirect subsidiary or Affiliate of
        another Person, "Principal Party" shall refer to such other Person; (2)
        in case such Person is a subsidiary, directly or indirectly, or
        Affiliate of more than one Person, the Common Stock of two or more of
        which are and have been so regis tered, "Principal Party" shall refer to
        whichever of such Persons is the issuer of the Common Stock having the
        greatest aggregate market value; and (3) in case such Person is owned,
        directly or indirectly, by a joint venture formed by two or more Persons
        that are not owned, directly or indirectly, by the same Person, the
        rules set forth in (1) and (2) above shall apply to each of the chains
        of ownership having an interest in such joint venture as if such party
        were a "Subsidiary" of both or all of such joint venturers and the
        Principal Parties in each such chain shall bear the obligations set
        forth in this Section 13 in the same ratio as their direct or indirect
        interests in such Person bear to the total of such interests.

        (c) The Company shall not consummate any such consolida tion, merger,
sale or transfer unless the Principal Party shall have a sufficient number of
authorized shares of its Common Stock that 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 each Principal Party and
each other Person who may become a Principal Party as a result of such
consolidation, merger, sale or transfer 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 consolida tion, merger, sale or transfer of
assets mentioned in para graph (a) of this Section 13, the Principal Party at
its own expense shall:

               (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, will use its best efforts to






                                      -24-
<PAGE>   28
        cause such registration statement to become effective as soon as
        practicable after such filing and will use its best efforts to cause
        such registration statement to remain effective (with a prospectus at
        all times meeting the requirements of the Act) until the Expira tion
        Date;

               (ii) use its best efforts to qualify or register the Rights and
        the securities purchasable upon exercise of the Rights under the blue
        sky laws of such jurisdictions as may be necessary or appropriate; and

               (iii) deliver to holders of the Rights histori cal financial
        statements for the Principal Party and each of its Affiliates which
        comply in all material 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 trans fers. The rights under this Section 13
shall be in addition to the rights to exercise Rights and adjustments under
Section 11(a)(ii) and shall survive any exercise thereunder.

        (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 Permitted Offer (or a
wholly owned subsidiary of any such Person or Persons), (ii) the price per share
of Common Stock offered in such trans action is not less than the price per
share of Common Stock paid to all holders of Common Stock whose shares were
purchased pursuant to such Permitted Offer and (iii) the form of consideration
being offered to the remaining holders of Common Stock pursuant to such
transaction is the same as the form of consideration paid pursuant to such
Permitted Offer. Upon consummation of any such transaction contemplated by this
subsection (d), all Rights hereunder shall expire.

        14. Additional Covenants.

        (a) The Company covenants and agrees that after the Stock Acquisition
Date it shall not (i) consolidate with, (ii) merge with or into, or (iii) sell
or transfer to any other Person, in one or more 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, if at the time of or after such
consolidation, merger or sale there are any charter or bylaw provisions or any
rights, warrants or other instruments outstanding or any other action taken
which would diminish or otherwise eliminate the benefits intended to be afforded
by the Rights. The Company shall not consummate any such consolida tion, merger
or sale unless prior thereto the Company and such 




                                      -25-
<PAGE>   29
other Person shall have executed and delivered to the Rights Agent a
supplemental agreement evidencing compliance with this subsection.

        (b) The Company covenants and agrees that, after the Stock Acquisition
Date, it will not, except as permitted by Section 24 hereof, take any action the
purpose or effect of which is to diminish or otherwise eliminate the benefits
intended to be afforded by the Rights.

        15. 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(n), 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 the purposes of this Section 15(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, 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 reasonably and with good faith to the holders of
Rights by the Board of Directors of the Company shall be used and shall be
binding on the Rights Agent.

        (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). Fractions of shares of Preferred Stock in integral
multiples of one one-thousandth of a share of Preferred Stock may, at the
election of the Company, be evidenced by depositary receipts, pursuant to an
appropriate agreement between the Company and a depositary selected by it,
provided that such agreement shall provide that the holders of such depositary
receipts shall have all the rights, privileges and preferences to which they are
entitled as beneficial owners of the shares of Preferred Stock represented by
such depositary receipts. In lieu of fractional shares of Preferred Stock that




                                      -26-
<PAGE>   30
are not integral multiples of one one-thousandth of a share of Preferred Stock,
the Company may pay to the registered holders of Right 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 15(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 one of the transactions or events
specified in Section 11 or Section 13 giving rise to the right to receive common
stock equivalents (other than Preferred Stock) or other securities upon the
exercise of a Right, the Company shall not be required to issue fractions of
shares or units of such common stock equivalents or other securities upon
exercise of the Rights or to distribute certificates which evidence fractional
shares of such common stock equivalents or other securities. In lieu of
fractional shares or units of such common stock equivalents or other securities,
the Company may pay to the registered holders of Right 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 a share or unit of such common stock
equivalent or other secur ities. For purposes of this Section 15(c), the current
market value shall be determined in the manner set forth in Section 11(d) hereof
for the Trading Day immediately prior to the date of such exercise and, if such
common stock equivalent is not traded, each such common stock equivalent shall
have the value of one one-thousandth of a share of Preferred Stock.

        (d) Except as otherwise expressly provided herein, the holder of a Right
by the acceptance of the Rights expressly waives such holder's right to receive
any fractional Rights or any fractional shares (other than, in the case of
Preferred Stock, fractions which are integral multiples of one one-thousandth of
a share of Preferred Stock) upon exercise of a Right.

        16. Rights of Action. All rights of action in respect of this Agreement,
except those rights of action vested in the Rights Agent pursuant to Section 21,
are vested in the respec tive 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 such holder's own behalf and for such any
suit, action or proceeding against the Company to enforce, or otherwise act in
respect of, such holder's right to exercise 




                                      -27-
<PAGE>   31
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.
Holders of Rights shall be entitled to recover the reasonable costs and
expenses, including attorneys' fees, incurred by them in any action to enforce
the provisions of this Agreement.

        17. 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 of the Rights Agent, duly endorsed
        or accompanied by a proper instrument of transfer; and

               (c) the Company and the Rights Agent may deem and treat the
        Person in whose name a Rights Certifi cate (or, prior to the
        Distribution Date, the associ ated 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 what
        soever, and neither the Company nor the Rights Agent shall be affected
        by any notice to the contrary.

        18. Rights Certificate Holder Not Deemed a Stockholder. 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 shares of Preferred Stock, Common
Stock or any other securities of the Company which may at any time be issu able
upon 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 stockholder of the
Company or any right to vote for the election of directors or upon any matter
submitted to stockholders at any meeting thereof, or to give or withhold consent
to any corporate action, or to receive notice of meetings or other actions
affecting stockholders (except as provided in Section 25 hereof), or to receive
dividends or subscription rights, or otherwise, until the Right




                                      -28-
<PAGE>   32
or Rights evidenced by such Rights Certificate shall have been exercised in
accordance with the provisions thereof.

        19. Concerning the Rights Agent. 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 adminis
tration 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
gross 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 the costs and
expenses of defending against any claim of liability arising therefrom, directly
or indirectly.

        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, instru ment
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.

        20. Merger or Consolidation or Change of Name of Rights Agent. 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
stockholder 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 that such corporation would be eligible for appointment
as a successor Rights Agent under the provisions of Section 22 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
the 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 counter signed, 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 in this Agreement.




                                      -29-
<PAGE>   33
        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 counter signed, the Rights Agent
may countersign such Rights Certifi cates 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.

        21. 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 selected by
        it (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, any Vice 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 certifi cate 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
        gross 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 Certifi cates (except as to the fact that it has
        countersigned the Rights Certificates) or be required to verify the




                                      -30-
<PAGE>   34
        same, 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
        Agree ment or in any Rights Certificate; nor shall it be responsible for
        any adjustment required under the provisions of Section 11 or 13 hereof
        or responsible for the manner, method or amount of any such adjust ment
        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 receipt of certificate pursuant to Section
        12 describing any such adjustment); nor shall it be responsible for any
        determination by the Board of Directors of the Company of the current
        market value of the Rights or Preferred Stock or Common Stock pursuant
        to the provisions of Section 15 hereof; 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 Preferred Stock or other
        securities to be issued pursuant to this Agreement or any Rights
        Certificate or as to whether any shares of Preferred Stock or other
        securities 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 and
        certificates delivered pursuant to any provision hereof from the
        Chairman of the Board, any Vice Chairman of the Board, the President,
        any Vice President, the Secretary, any Assistant Secretary, the
        Treasurer or any Assistant Treasurer of the Company, and is authorized
        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. Any application by the Rights Agent for 




                                      -31-
<PAGE>   35
        written instructions from the Company may, at the option of the Rights
        Agent, set forth in writing any action proposed to be taken or omitted
        by the Rights Agent with respect to its duties or obligations under this
        Rights Agreement and the date on and/or after which such action shall be
        taken or omitted and the Rights Agent shall not be liable for any action
        taken or omitted in accordance with a proposal included in any such
        application on or after the date specified therein (which date shall not
        be less than three Business Days after the date any such officer
        actually receives such application, unless any such officer shall have
        consented in writing to an earlier date) unless, prior to taking or
        omitting any such action, the Rights Agent has received written
        instructions in response to such application specifying the action to be
        taken or omitted.

               (h) The Rights Agent and any stockholder, 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 other wise 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, omission, default,
        neglect or misconduct of any such attorneys or agents or for any loss to
        the Company or to the holders of the Rights resulting from any such act,
        omission, default, neglect or misconduct, provided 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 Rights Certificate surrendered
        to the Rights Agent for exercise or transfer, the Certificate attached
        to the form of 




                                      -32-
<PAGE>   36
        assignment or form of election to purchase, as the case may be, has
        either not been completed or indicates an affirmative response to
        clause l 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.

        22. Change of Rights Agent. The Rights Agent or any successor Rights
Agent may resign and be discharged from its duties under this Agreement upon 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 holders
of the Rights Certificates by first-class mail. The Company may remove the
Rights Agent or any successor Rights Agent upon 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 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 such
holder's Rights Certificate for inspection by the Company), then the 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) a
corporation organized and doing business under the laws of the United States or
of the State of New York or the State of California (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 or the State of California), in
good standing, having a principal office in the State of New York or the State
of California, which is authorized under such laws to exercise corporate trust
or stockholder services 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 $50,000,000 or (b) an
affiliate of a corporation described in clause (a) of this sentence. 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 




                                      -33-
<PAGE>   37
Stock and 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 22, 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.

        23. 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 per share 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 otherwise under any employee plan or arrangement,
which plan or arrangement is existing as of the Distribution Date, or upon the
exercise, conversion or exchange of any other securities issued by the Company
on or prior to the Distribution Date, and (b) may, in any other case, if deemed
necessary or appropriate by the Board of Directors of the Company, issue Right
Certifi cates representing the appropriate number of Rights in connection with
such issuance or sale; provided, however, that (i) no such Rights Certificates
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 Certificates
would be issued, and (ii) no such Rights Certificates shall be issued if, and to
the extent that appropriate adjustment shall otherwise have been made in lieu
of the issuance thereof.

        24. Redemption, Termination and Exchange.

        (a) (i) The Board of Directors of the Company may, at its option, at any
time prior to the earlier of (x) the Stock Acquisition Date or (y) 5 P.M., San
Diego time, on the Final Expiration Date, redeem all but not less than all of
the then outstanding Rights at a redemption price of $.01 per Right,
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").

        (ii) In addition, and notwithstanding the provisions of Section
24(a)(i), the Board of Directors of the Company may redeem all but not less than
all of the then outstanding Rights at the Redemption Price following the Stock
Acquisition Date but prior to any event described in Section 13(a) either (x) in




                                      -34-
<PAGE>   38
connection with any event specified in Section 13(a) in which all holders of
Common Stock are treated alike and not involving (other than as a holder of
Common Stock being treated like all other such holders) an Acquiring Person or
an Affiliate or Associate thereof or any other Person in which such Acquiring
Person or Affiliate or Associate thereof has any interest, or any other Person
acting directly or indirectly on behalf of or in association with any such
Acquiring Person or Affiliate or Associate thereof, or (y) following the
occurrence of an event set forth in, and the expiration of any period during
which the holder of Rights may exercise the rights under, Section 11(a)(ii) if
and for as long as any Acquiring Person having triggered such event is not
thereafter the Beneficial Owner of securities representing 15% or more of the
outstanding shares, and at the time of redemption there are no other Persons who
are Acquiring Persons.

        (b) In the case of a redemption permitted under Section 24(a)(i),
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. In the case of a redemption
permitted only under Section 24(a)(ii), evidence of which shall have been filed
with the Rights Agent, the right to exercise the Rights will terminate and
represent only the right to receive the Redemption Price only after ten Business
Days following the giving of notice of such redemption to the holders of such
Rights if no event set forth in Section 11(a)(ii) shall have occurred, and, if
such event shall have occurred, upon the later of ten Business Days following
the giving of such notice or the expiration of any period during which the
rights under Section 11(a)(ii) may be exercised. Within ten days after the
action of the Board of Directors ordering any such 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 the Rights Agent and to
all such holders at their last addresses as they appear 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.

        In the case of a redemption permitted under Section 24(a)(i) or (ii),
the Company may, at its option, discharge all of its obligations with respect to
the Rights by (i) issuing a press release announcing the manner of redemption of
the Rights and (ii) mailing payment of the Redemption Price to the registered
holders of the Rights at their last addresses as they appear on the registry
books of the Rights Agent or, prior to 




                                      -35-
<PAGE>   39
the Distribution Date, on the registry books of the Transfer Agent of the Common
Stock, and upon such action, all outstanding Rights Certificates shall be null
and void without any further action by the Company.

        (c) (i) Subject to the limitations of applicable law, the Board of
Directors of the Company may, at its option, at any time after any Person
becomes an Acquiring Person, exchange all or part of the then outstanding and
exercisable Rights (which shall not include Rights that have become void
pursuant to the provisions of Section 7(e) hereof) for (A) shares of Common
Stock at an exchange ratio of one share of Common Stock per Right, appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof (the "Exchange Shares") or (B) Substitute
Consideration (as that term is defined below). The Board of Directors may
determine, in its sole discretion, whether to deliver Exchange Shares or
Substitute Consideration. Notwithstanding the foregoing, the Board of Directors
shall not be empowered to effect such exchange at any time after any Person
(other than the Company, any subsidiary of the Company, any employee benefit
plan of the Company or any such subsidiary, or any entity holding Common Stock
for or pursuant to the terms of any such plan), together with all Affiliates and
Associates of such Person, becomes the Beneficial Owner of 50% or more of the
Common Stock then outstanding.

        (ii) In the event the Board of Directors shall determine to deliver
Substitute Consideration in exchange for Rights, the Company shall (1) determine
the value of the Exchange Shares (the "Exchange Value"), and (2) with respect to
each Right to be exchanged, make adequate provision to substitute for Exchange
Shares the following (the "Substitute Consideration"): (v) cash, (w) Common
Stock or common stock equivalents (as that term is defined in Section 11(a)(iii)
hereof) or Preferred Stock or equivalent preferred stock (as that term is
defined in Section 11(b) hereof), (x) debt securities of the Company, (y) other
assets, or (z) any combination of the foregoing, having an aggregate value equal
to the Exchange Value, where such aggregate value has been determined by the
Board of Directors of the Company based upon the advice of a nationally
recognized investment banking firm selected by the Board of Directors of the
Company. For purposes of this Section 24(c), the value of a share of Common
Stock shall be the current market price (as determined pursuant to Section 11(d)
hereof) per share of Common Stock on the day that is the later of (x) the first
occurrence of an event described in Section 11(a)(ii) hereof and (y) the date on
which the Company's right of redemption pursuant to Section 24(a) expires; and
the value of any common stock equivalent shall be deemed to have the same value
as the Common Stock on such date.

        (iii) Immediately upon the action of the Board of Directors of the
Company ordering the exchange of any Rights




                                      -36-
<PAGE>   40
pursuant to this Section 24(c), and without any further action and without any
notice, the right to exercise such Rights shall terminate and the only right
thereafter of a holder of such Rights shall be to receive Exchange Shares or
Substitute Consideration for each Right exchanged by such holder. The Company
shall promptly give public notice of any such exchange; provided, however, that
the failure to give, or any defect in, such notice shall not affect the validity
of such exchange. The Company promptly shall mail a notice of any such exchange
to all of the holders of such Rights at their last address as they appear upon
the registry books of the Rights Agent. 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 exchange will state the method by which the exchange
of Common Stock for Rights will be effected and, in the event of any partial
exchange, the number of Rights which will be exchanged. Any partial exchange
shall be effected pro rata based on the number of Rights (other than Rights
which have become void pursuant to the provisions of Section 7(e) hereof) held
by each holder of Rights.

        (iv) In the event that there shall not be sufficient shares of Common
Stock or Preferred Stock issued but not outstanding or authorized but unissued
to permit any exchange of Rights as contemplated in accordance with this Section
24(c), the Company shall take all such action as may be necessary to authorize
additional shares of Common Stock or Preferred Stock for issuance upon exchange
of the Rights.

        (v) The Company shall not be required to issue fractions of shares of
Common Stock or to distribute certificates which evidence fractional shares of
Common Stock. In lieu of such fractional shares of Common Stock, the Company
shall pay to the registered holders of the Rights Certificates with regard to
which such fractional shares of Common Stock would otherwise be issuable an
amount in cash equal to the same fraction of the current market value of a whole
share of Common Stock. For the purposes of this Section 24(c)(v), the current
market value of a whole share of Common Stock shall be the closing price of a
share of Common Stock (as determined pursuant to Section 11(d) hereof) for the
Trading Day immediately prior to the date of exchange pursuant to this Section
24(c).

        25. Notice of Certain Events. In case the Company shall propose (a) 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 (b) 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 (c) to
effect any reclass ification of its Preferred Stock (other than a
reclassification involving only the subdivision of outstanding shares of




                                      -37-
<PAGE>   41
Preferred Stock), or (d) to effect any consolidation or merger into or with, 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 or more 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 (e) 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, in accordance
with Section 26 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 (a) or (b) above at least 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 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.

        In case any of the events set forth in Section 11(a)(ii) or 13(a) of
this Agreement shall occur, then, in any such case, the Company or the Principal
Party, as the case may be, shall as soon as practicable thereafter give to each
holder of a Rights Certificate, in accordance with Section 26 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) or 13(a)
hereof, as the case may be.

        26. 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:

                Biosite Diagnostics Incorporated
                11030 Roselle Street
                San Diego, CA 92121
                Attention:  Chief Executive Officer

Subject to the provisions of Section 22, 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:





                                      -38-
<PAGE>   42
                BankBoston, N.A.
                c/o Boston Equiserve Limited Partnership
                150 Royall Street
                Canton, Massachusetts 02021
                Attention:  Shareholder Services
                            Mail Stop: 45-02-623

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 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.

        27. Supplements and Amendments. The Company and the Rights Agent may
from time to time supplement or amend this Agreement without approval of any
holders of Rights or Right 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) prior to the
Distribution Date, to change or supplement any provision hereunder in any manner
which the Company may deem necessary or desirable or (iv) on or following the
Distribution Date, to change or supplement any provision 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. 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
27, the Rights Agent shall execute such supplement or amendment unless the
Rights Agent shall have determined in good faith that such supplement or
amendment would adversely affect its interests under this Agreement. 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.

        28. Determination 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 or any
other securities 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 as in effect on the date of this
Agreement. Except as otherwise provided herein, 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 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




                                      -39-
<PAGE>   43
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 fore going) 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 Certificates and all other parties, and (y) not subject
the Board to any liability to the holders of the Rights Certificates.

        29. 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.

        30. Benefits of This Agreement. Nothing in this Agreement shall be
construed to give to any person or corporation other than the Company, the
Rights Agent and the registered holders of the Rights Certificates (and, prior
to the Distribution Date, 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, the Common Stock).

        31. 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.

        32. 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 Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such state applicable to contracts to
be made and to be performed entirely within such state.

        33. 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.

        34. Descriptive Headings. Descriptive headings of the several Sections
of this Agreement are inserted for convenience




                                      -40-
<PAGE>   44
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:                                      BIOSITE DIAGNOSTICS INCORPORATED



/s/ Christopher J. Twomey                    By  /s/ Kim D. Blickenstaff
- -------------------------------------          ---------------------------------
    Christopher J. Twomey                            Kim D. Blickenstaff
Title V.P. Finance & Administration          Title   President & CEO

Attest:                                      BANKBOSTON, N.A., as Rights Agent



/s/ Carl Statkiewicz                         By  /s/ Geoffrey D. Anderson
- -------------------------------------          ---------------------------------
Title Account Manager                        Title   Director






                                      -41-
<PAGE>   45
                                    EXHIBIT A

                           CERTIFICATE OF DESIGNATION,

                             RIGHTS AND PREFERENCES

                    OF SERIES A PARTICIPATING PREFERRED STOCK

                                       OF

                        BIOSITE DIAGNOSTICS INCORPORATED


        We, Kim D. Blickenstaff, President, and Christopher J. Twomey, Assistant
Secretary, of Biosite Diagnostics Incorporated, a corporation organized and
existing under the General Corporation Law of the State of Delaware, DO HEREBY
CERTIFY:

        That pursuant to the authority conferred upon the Board of Directors by
the Certificate of Incorporation of the said Corporation, the Board of Directors
on October 22, 1997 adopted the following resolution creating a series of 25,000
shares of Preferred Stock designated as Series A Participating Preferred Stock:

        RESOLVED, that pursuant to the authority vested in the Board of
Directors of this Company in accordance with the provisions of its Certificate
of Incorporation, a series of Preferred Stock of the Company be and it hereby is
created, and that the designation and amount thereof and the powers, preferences
and relative, participating, optional and other special rights of the shares of
such series, and the qualifications, limitations or restrictions thereof are as
follows:

        1. Designation and Amount. The shares of such series shall be designated
as "Series A Participating Preferred Stock," $0.01 par value per share, and the
number of shares constituting such series shall be 25,000. Such number of shares
may be increased or decreased by resolution of the Board of Directors; provided,
that no decrease shall reduce the number of shares of Series A Participating
Preferred Stock to a number less than that of the shares then outstand ing plus
the number of shares issuable upon exercise of outstanding rights, options or
warrants or upon conversion of outstanding securities issued by the Corporation.

        2. Dividends and Distributions.

        (A) Subject to the prior and superior rights of the holders of any
shares of any series of Preferred Stock ranking prior and superior to the shares
of Series A Participating Preferred Stock with respect to dividends, the holders
of shares of Series A Participating Preferred Stock in preference to 




                                      A-1
<PAGE>   46
the holders of shares of Common Stock, par value $.01 per share (the "Common
Stock"), of the Corporation and any other junior 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 first 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 Participating Preferred Stock in an amount per
share (rounded to the nearest cent) equal to the greater of (a) $100.00, 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 shares of Common Stock or a
subdivi sion of the outstanding shares of Common Stock (by reclassification or
otherwise), declared on the Common Stock, 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 Participating Preferred Stock. In the event the Corporation
shall at any time after the close of business on November 3, 1997 (the "Rights
Declaration Date") (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, by reclassification or
otherwise, then in each such case the amount to which holders of shares of
Series A 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
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

        (B) The Corporation shall declare a dividend or distribution on the
Series A Participating Preferred Stock as provided in paragraph (A) above
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided that, in the
event no dividend or distribution shall have been declared on the Common Stock
during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $100 per share on the
Series A 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 Participating Preferred Stock from the Quarterly Dividend
Payment Date next preceding the date of issue of such shares of Series A
Participating Preferred Stock unless the date of issue of such shares is prior
to the




                                      A-2
<PAGE>   47
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 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 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 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.

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

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

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




                                      A-3
<PAGE>   48
                (C) (i) If at any time dividends on any Series A Participating
        Preferred Stock shall be in arrears in an amount equal to six 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 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 Participating Preferred Stock) with
        dividends in arrears in an amount equal to six quarterly dividends
        thereon, voting as a class, irrespective of series, shall have the right
        to elect two directors.

                (ii) During any default period, such voting right of the holders
        of Series A 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 stockholders, and thereafter at annual
        meetings of stockholders, provided that neither such voting right nor
        the right of the holders of any other series of Preferred Stock, if any,
        to increase, in certain cases, the authorized number of directors shall
        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 Stock 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
        directors or, if such right is exercised at an annual meeting, to elect
        two 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
        Participating Preferred Stock.




                                      A-4
<PAGE>   49
                (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 any stockholder or
        stockholders 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 a 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 such holder at such holder's last address as the same
        appears on the books of the Corporation. Such meeting shall be called
        for a time not earlier than ten 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 stockholder or stockholders 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 stockholders.

                (iv) In any default period, the holders of Common Stock, 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
        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 a 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




                                      A-5
<PAGE>   50
        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, or pursuant to, the Certificate of Incorporation or
        Bylaws 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 Certificate
        of Incorporation or Bylaws). 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, even
        though less than a quorum.

                (D) Except as set forth herein, holders of Series A
        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 Stock as set forth herein) for
        taking any corporate action.

        4. Certain Restrictions.

        (A) Whenever quarterly dividends or other dividends or distributions
payable on the Series A 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 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 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
        Participating Preferred Stock except dividends paid ratably on the
        Series A 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, 



                                      A-6
<PAGE>   51
        dissolution or winding up) with the Series A 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
        Participating Preferred Stock; or

                (iv) purchase or otherwise acquire for consideration any shares
        of Series A Participating Preferred Stock or any shares of stock ranking
        on a parity with the Series A 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.

        5. Reacquired Shares. Any shares of Series A 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 condi tions and restrictions on issuance set forth
herein.

        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 Participating Preferred Stock unless,
prior thereto, the holders of shares of Series A Participating Preferred Stock
shall have received per share, the greater of 1,000 times $1.00 or 1,000 times
the payment made per share of Common Stock, 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




                                      A-7
<PAGE>   52
shall be made to the holders of shares of Series A Participating Preferred Stock
unless, prior thereto, the holders of shares of Common Stock 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 recapitalization with respect to the Common Stock)
(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 Participating Preferred Stock
and Common Stock, respectively, holders of Series A Participating Preferred
Stock and holders of shares of Common Stock 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
Stock, on a per share basis, respectively.

        (B) In the event 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 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 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 Stock.

        (C) In the event the Corporation shall at any time after the Rights
Declaration Date (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, by reclassification or
otherwise, 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 shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.

        7. Consolidation, Merger, etc. In case the Corporation shall enter into
any consolidation, merger, combination or other transaction in which the shares
of Common Stock 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
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,




                                      A-8
<PAGE>   53
into which or for which each share of Common Stock is changed or exchanged. In
the event the Corporation shall at any time after the Rights Declaration Date
(i) declare any dividend on Common Stock payable in shares of Common Stock, (ii)
subdivide the outstanding Common Stock, or (iii) combine the outstanding Common
Stock 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 Participating Preferred Stock shall be adjusted by multiplying such
amount by a fraction the numerator of which is the number of shares of Common
Stock outstanding immediately after such event and the denominator of which is
the number of shares of Common Stock that are outstanding immediately prior to
such event.

        8. Redemption. The shares of Series A Participating Preferred Stock
shall not be redeemable.

        9. Ranking. The Series A Participating 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.

        10. Amendment. The Certificate of Incorporation and the Bylaws 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
Participating Preferred Stock so as to affect them adversely without the
affirmative vote of the holders of at least 66-2/3% of the outstanding shares of
Series A Participating Preferred Stock voting separately as a class.

        11. Fractional Shares. Series A Participating Preferred Stock may be
issued in fractions of a share which shall entitle the holder, in proportion to
such holder's 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 Participating Preferred Stock.

        IN WITNESS WHEREOF, we have executed and subscribed this Certificate and
do affirm the foregoing as true under the penalties of perjury this 22th day of
October, 1997.



                                             /s/ Kim D. Blickenstaff
                                       -----------------------------------------
                                                     President


                                       Attest:


                                             /s/ Christopher J. Twomey
                                       -----------------------------------------
                                                     Secretary





                                      A-9
<PAGE>   54
                                    EXHIBIT B


                           Form of Rights Certificate


Certificate No. R-______________                          _____________ Rights

        NOT EXERCISABLE AFTER OCTOBER 22, 2007 OR EARLIER IF NOTICE OF
        REDEMPTION OR EXCHANGE IS GIVEN. THE RIGHTS ARE SUBJECT TO REDEMPTION,
        AT THE OPTION OF THE COMPANY, AT $.01 PER RIGHT AND TO EXCHANGE ON THE
        TERMS SET FORTH IN THE RIGHTS AGREEMENT. [THE RIGHTS REPRESENTED BY THIS
        RIGHTS CERTIFICATE WERE ISSUED TO A PERSON WHO WAS AN ACQUIRING PERSON
        OR AN ASSOCIATE OR AFFILIATE OF AN ACQUIRING PERSON (AS SUCH TERMS ARE
        DEFINED IN THE RIGHTS AGREEMENT). THIS RIGHTS CERTIFICATE AND THE RIGHTS
        REPRESENTED HEREBY MAY BECOME VOID UNDER THE CIRCUMSTANCES SPECIFIED IN
        SECTION 7(e) OF THE RIGHTS AGREEMENT.]*


                               Rights Certificate

                        BIOSITE DIAGNOSTICS INCORPORATED


        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 October 22, 1997 (the "Rights Agreement") between Biosite
Diagnostics Incorporated, a Delaware corporation (the "Company"), and
BankBoston, N.A, a national banking association (the "Rights Agent"), to
purchase from the Company at any time after the Distribution Date (as such term
is defined in the Rights Agreement) and prior to 5 P.M. (Massachusetts time) on
October 22, 2007, at the office of the Rights Agent designated for such purpose,
one one-thousandth of a fully paid, nonasses sable share of Series A
Participating Preferred Stock, par value $0.01 per share (the "Preferred Stock")
of the Company, at a purchase price of $50.00 per one one-thousandth of a share
(the "Purchase Price"), upon presentation and surrender of this Rights
Certificate with the appropriate Form of Election to pur chase and 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 set forth above, are the number and Purchase Price
as of the close of business on October 22, 2007, based on the Preferred Stock as
constituted at such date.


- ---------------------
* The portion of the legend in brackets shall be inserted only if applicable.




                                      B-1
<PAGE>   55
        As provided in the Rights Agreement, the Purchase Price and the number
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.

        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. Copies of
the Rights Agreement are on file at the principal office of the Company and are
also available upon written request to the Company.

        This Rights Certificate, with or without other Rights Certificates, upon
surrender at the office 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 aggre gate
number of shares 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 (other than pursuant
to Section 11(a)(ii) of the Rights Agreement) 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. If this Rights
Certificate shall be exercised in whole or in part pursuant to Section 11(a)(ii)
of the Rights Agreement, the holder shall be entitled to receive this Rights
Certificate duly marked to indicate that such exer cise has occurred as set
forth in the Rights Agreement.

        Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Certificate (i) may be redeemed by the Company at its option at a
redemption price of $.01 per Right or (ii) may be exchanged in whole or in part
for shares of the Company's Common Stock par value $0.01 or substitute
consideration. Subject to the provisions of the Rights Agreement, the Company,
at its option, may elect to mail payment of the redemption price to the
registered holder of the Right at the time of redemption, in which event this
certificate may become void without any further action by the Company.

        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.




                                      B-2
<PAGE>   56
        No holder of this Rights Certificate, as such, 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 stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (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:  ____________, ____.

Attest:                                     BIOSITE DIAGNOSTICS INCORPORATED



____________________________                By _______________________________

Title ______________________                Title ____________________________


Countersigned:

BANKBOSTON, N.A.,
as Rights Agent



By _________________________





                                      B-3
<PAGE>   57
                  [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 transfers 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:  ____________, ____.



                                            ____________________________________
                                                        Signature



                                            ____________________________________
                                                        Signature

Signature(s) Guaranteed:


______________________________






                                      B-4
<PAGE>   58
                                   CERTIFICATE


        The undersigned hereby certifies by checking the appropri ate boxes
that:

        (1) the Rights evidenced by this Rights Certificate [ ] are [ ] are 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 in 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 subse quently became an Acquiring Person or an
Affiliate or Associate of an Acquiring Person.

        Dated:  ____________, ____.



                                            ____________________________________
                                                        Signature


                                     NOTICE


        The signature to the foregoing Assignment 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.





                                      B-5
<PAGE>   59
                          FORM OF ELECTION TO PURCHASE

                (To be executed if holder desires to exercise the
             Rights Certificate pursuant to Section 11(a)(ii) of the
             Rights Agreement.)


To      BIOSITE DIAGNOSTICS INCORPORATED:


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

________________________________________________________________________________
           (Please insert social security or other identifying number)

________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________


        The Rights Certificate indicating the balance, if any, of such Rights
which may still be exercised pursuant to Section 11(a)(ii) of the Rights
Agreement shall be returned to the undersigned unless such Person requests that
the Rights Certifi cate be registered in the name of and delivered to:

________________________________________________________________________________
Please insert social security or other identifying number (complete only if
Rights Certificate is to be registered in a name other than the undersigned)

________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________


        Dated:  ____________, ____.



______________________________                     _____________________________
        Signature                                             Signature


Signature(s) Guaranteed:



______________________________






                                      B-6
<PAGE>   60
                                   CERTIFICATE


        The undersigned hereby certifies by checking the appropri ate 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) 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
in the Rights Agree ment);

        (3) 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 subse quently became an Acquiring Person or an
Affiliate or Associate of an Acquiring Person.

        Dated:  ____________, ____.



                                            ____________________________________
                                                          Signature


                                     NOTICE


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





                                      B-7
<PAGE>   61
                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise
                  the Rights Certificate other than pursuant to
                   Section 11(a)(ii) of the Rights Agreement.)


To      BIOSITE DIAGNOSTICS INCORPORATED:


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

________________________________________________________________________________
          (Please insert social security or other identifying number)

________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________


        The Rights Certificate indicating the balance, if any, of such Rights
which may still be exercised pursuant to Section 11(a)(ii) of the Rights
Agreement shall be returned to the undersigned unless such Person requests that
the Rights Certifi cate be registered in the name of and delivered to:

- --------------------------------------------------------------------------------
Please insert social security or other identifying number (complete only if
Rights Certificate is to be registered in a name other than the undersigned)

________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________



        Dated:  ____________, ____.



______________________________                     _____________________________
        Signature                                             Signature


Signature(s) Guaranteed:



______________________________






                                      B-8
<PAGE>   62
                                   CERTIFICATE


        The undersigned hereby certifies by checking the appropri ate boxes
that:

        (1) the Rights evidenced by this Rights Certificate [ ] are [ ] are 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 in 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 subse quently became an Acquiring Person or an
Affiliate or Associate of an Acquiring Person.


        Dated:  ____________, ____.



                                            ____________________________________
                                                          Signature


                                     NOTICE


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







                                      B-9
<PAGE>   63
                                    EXHIBIT C

                                SUMMARY OF RIGHTS


        On October 22, 1997 the Board of Directors of Biosite Diagnostics
Incorporated (the "Company") declared a dividend distribution of one Right for
each outstanding share of common stock, $0.01 par value (the "Common Stock"), of
the Company to stockholders of record at the close of business on November 3,
1997 (the "Record Date"). Except as set forth below, each Right, when
exercisable, entitles the registered holder to purchase from the Company one
one-thousandth share of a new series of preferred stock, designated as Series A
Participating Preferred Stock, $0.01 par value (the "Preferred Stock"), at a
price of $50.00 per one one-thousandth of a share (the "Purchase Price"),
subject to adjustment. The description and terms of the Rights are set forth in
a Rights Agreement (the "Rights Agreement") between the Company and BankBoston,
N.A., as Rights Agent.

        Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights certificates will
be distributed. The Rights will separate from the Common Stock and a
Distribution Date will occur upon the earliest of (i) a public announcement that
a Person or group of affiliated or associated Persons (an "Acquiring Person")
has acquired, or obtained the right to acquire beneficial ownership of
securities having 15% or more of the voting power of all outstanding voting
securities of the Company or (ii) ten days (unless such date is extended by the
Board of Directors) following the commencement of (or a public announcement of
an intention to make) a tender offer or exchange offer which would result in any
Person or group and related Persons becoming an Acquiring Person.

        Until the Distribution Date the Rights will be evidenced, with respect
to any of the Common Stock certificates outstanding as of the Record Date, by
such Common Stock certificate together with this Summary of Rights. The Rights
Agreement provides that, until the Distribution Date, the Rights will be trans
ferred with and only with Common Stock certificates. From as soon as practicable
after the Record Date and until the Distri bution Date (or earlier redemption or
expiration of the Rights), new Common Stock certificates issued after the Record
Date upon transfer or new issuance of the Common Stock will contain a notation
incorporating the Rights Agreement by reference. Until the Distribution Date (or
earlier redemption or expiration of the Rights), the surrender for transfer of
any certificates for Common Stock outstanding as of the Record Date (with or
without this Summary of Rights attached) will also constitute the trans fer of
the Rights associated with the Common Stock represented by such certificate. As
soon as practicable following the 




                                      C-1
<PAGE>   64
Distribution Date, separate certificates evidencing the Rights ("Rights
Certificates") will be mailed to holders of record of the Common Stock as of the
close of business on the Distribution Date, and the separate Rights Certificates
alone will evidence the Rights.

        The Rights are not exercisable until the Distribution Date. The Rights
will expire on the earliest of (i) October 22, 2007, (ii) consummation of a
merger transaction with a Person or group who acquired Common Stock pursuant to
a Permitted Offer (as defined below), and is offering in the merger the same
price per share and form of consideration paid in the Permitted Offer, or (iii)
redemption or exchange by the Company as described below.

        The Purchase Price payable, and the number of shares 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) upon the grant to holders of the Preferred Stock of
certain rights or warrants to subscribe for Preferred Stock, certain convertible
securities or securities having the same or more favorable rights, privileges
and preferences as the Preferred Stock 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 out of earnings or retained earnings) or of subscription rights or
warrants (other than those referred to above).

        In the event that, after the first date of public announce ment by the
Company or an Acquiring Person that an Acquiring Person has become such, the
Company is involved in a merger or other business combination transaction
(whether or not the Company is the surviving corporation) or 50% or more of the
Company's assets or earning power are sold (in one transaction or a series of
transactions), proper provision shall be made so that each holder of a Right
(other than an Acquiring Person) shall thereafter have the right to receive,
upon the exercise thereof at the then current exercise price of the Right, that
number of shares of common stock of either the Company, in the event that it is
the surviving corporation of a merger or consolidation, or the acquiring company
(or, in the event there is more than one acquiring company, the acquiring
company receiving the greatest portion of the assets or earning power
transferred) which at the time of such transaction would have a market value of
two times the exercise price of the Right (such right being called the "Merger
Right"). In the event that a Person becomes the beneficial owner of securities
having 15% or more of the voting power of all then outstanding voting securities
of the Company (unless pursuant to a tender offer or exchange offer for all
outstanding shares of Common Stock at a price and on terms determined prior to
the date of the first





                                      C-2
<PAGE>   65
acceptance of payment for any of such shares by at least a majority of the
members of the Board of Directors who are not officers of the Company and are
not Acquiring Persons or Affili ates or Associates thereof to be both adequate
and otherwise in the best interests of the Company and its stockholders (a
"Permitted Offer")), then proper provision shall be made so that each holder of
a Right will for a 60-day period (subject to extension under certain
circumstances) thereafter have the right to receive upon exercise that number of
shares of Common Stock having a market value of two times the exercise price of
the Right, to the extent available, and then (after all authorized and
unreserved shares of Common Stock have been issued) a common stock equivalent
(such as Preferred Stock or another equity security with at least the same
economic value as the Common Stock) having a market value of two times the
exercise price of the Right, with Common Stock to the extent available being
issued first (such right being called the "Subscription Right"). The holder of a
Right will continue to have the Merger Right whether or not such holder
exercises the Subscription Right. Notwithstanding the foregoing, upon the
occurrence of any of the events giving rise to the exercisability of the Merger
Right or the Subscription Right, any Rights that are or were at any time after
the Distribution Date owned by an Acquiring Person shall immediately become null
and void.

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

        At any time prior to the earlier to occur of (i) a Person becoming an
Acquiring Person or (ii) the expiration of the Rights, the Company may redeem
the Rights in whole, but not in part, at a price of $.01 per Right (the
"Redemption Price"), which redemption shall be effective upon the action of the
Board of Directors. Additionally, the Company may thereafter redeem the then
outstanding Rights in whole, but not in part, at the Redemption Price (i) if
such redemption is incidental to a merger or other business combination
transaction or series of transactions involving the Company but not involving an
Acquiring Person or certain related Persons or (ii) following an event giving
rise to, and the expiration of the exercise period for, the Subscription Right
if and for as long as an Acquiring Person beneficially owns securities
representing less than 15% of the voting power of the Company's voting
securities. The redemption of Rights described in the preceding sentence shall
be effective only as of such time when the Subscription Right is not
exercisable, and in any event, only after ten Business Days' prior notice. Upon
the effective date of the redemption of the Rights, the right to exercise the
Rights will terminate and the




                                      C-3
<PAGE>   66
only right of the holders of Rights will be to receive the Redemption Price.

        Subject to applicable law, the Board of Directors, at its option, may at
any time after a Person becomes an Acquiring Person (but not after the
acquisition by such Person of 50% or more of the outstanding Common Stock),
exchange all or part of the then outstanding and exercisable rights (except for
Rights which have become void) for shares of Common Stock equivalent to one
share of Common Stock per Right (subject to adjustment) or, alternatively, for
substitute consideration consisting of cash, securities of the Company or other
assets (or any combination thereof).

        The Preferred Stock purchasable upon exercise of the Rights will be
nonredeemable and junior to any other series of preferred stock the Company may
issue (unless otherwise provided in the terms of such stock). Each share of
Preferred Stock will have a preferential quarterly dividend in an amount equal
to 1,000 times the dividend declared on each share of Common Stock, but in no
event less than $100.00. In the event of liquidation, the holders of Preferred
Stock will receive a preferred liquidation payment equal to the greater of 1,000
times $1.00 or 1,000 times the payment made per each share of Common Stock. Each
share of Preferred Stock will have 1,000 votes, voting together with the shares
of Common Stock. In the event of any merger, consolidation or other transaction
in which shares of Common Stock are exchanged, each share of Preferred Stock
will be entitled to receive 1,000 times the amount and type of con sideration
received per share of Common Stock. The rights of the Preferred Stock as to
dividends, liquidation and voting, and in the event of mergers and
consolidations, are protected by customary antidilution provisions. Fractional
shares of Preferred Stock will be issuable; however, the Company may elect to
distribute depositary receipts in lieu of such fractional shares. In lieu of
fractional shares other than fractions that are multiples of one one-thousandth
of a share, 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.

        Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.

        A copy of the Rights Agreement has been filed with the Securities and
Exchange Commission as an Exhibit to a Registra tion 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.





                                      C-4




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