<PAGE>   1
                                                                     EXHIBIT 4.1





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                               Geron Corporation

                                       and

                         U.S. Stock Transfer Corporation

                                 as Rights Agent

                                Rights Agreement

                            Dated as of July 20, 2001


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<PAGE>   2





                                RIGHTS AGREEMENT

        Rights Agreement, dated as of July 20, 2001, between Geron Corporation,
a Delaware corporation (the "Company"), and U.S. Stock Transfer Corporation, a
California corporation, as Rights Agent (the "Rights Agent").

                                    RECITALS

        WHEREAS, on July 20, 2001, the Board of Directors of the Company adopted
this Agreement, and has authorized and declared a dividend of one preferred
share purchase right (a "Right") for each Common Share (as defined in Section
1.6) of the Company outstanding at the close of business on July 31, 2001 (the
"Record Date") and has authorized and directed the issuance of one Right
(subject to adjustment as provided herein) with respect to each Common Share
that shall become outstanding between the Record Date and the earliest of the
Distribution Date and the Expiration Date (as such terms are defined in Sections
3.1 and 7.1), each Right initially representing the right to purchase one
one-thousandth (subject to adjustment) of a share of Series A Junior
Participating Preferred Stock (the "Preferred Shares") of the Company having the
rights, powers and preferences set forth in the form of Certificate of
Designation attached hereto as Exhibit A, upon the terms and subject to the
conditions hereinafter set forth PROVIDED, HOWEVER, that Rights may be issued
with respect to Common Shares that shall become outstanding after the
Distribution Date and prior to the Expiration Date in accordance with Section
22.

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

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

                1.1. Acquiring Person" shall mean any Person (as such term is
hereinafter defined) who or which, together with all Affiliates and Associates
(as such terms are hereinafter defined) of such Person, shall be the Beneficial
Owner (as such term is hereinafter defined) of 15% or more of the Common Shares
of the Company then outstanding but shall not include an Exempt Person.
Notwithstanding the foregoing, no Person shall become an "Acquiring Person" as
the result of an acquisition of Common Shares by the Company which, by reducing
the number of shares outstanding, increases the proportionate number of shares
beneficially owned by such Person to 15% or more of the Common Shares of the
Company then outstanding; PROVIDED, however, that if a Person shall become the
Beneficial Owner of 15% or more of the Common Shares of the Company then
outstanding solely by reason of share purchases by the Company and shall, after
such share purchases by the Company, become the Beneficial Owner of one or more
additional Common Shares of the Company, then such Person shall be deemed to be
an "Acquiring Person." Notwithstanding the foregoing, if the Board of Directors
of the Company determines in good faith that a Person who would otherwise be an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
Section 1.1, has become such inadvertently (including, without limitation,
because (A) such Person was unaware that it beneficially owned a percentage of
Common Stock that would otherwise cause such Person to be an "Acquiring Person"
or (B) such Person was aware of the extent of its Beneficial Ownership of

<PAGE>   3


Common Stock but had no actual knowledge of the consequences of such Beneficial
Ownership under this Agreement), and without any intention of changing or
influencing control of the Company, and such Person divests as promptly as
practicable a sufficient number of Common Shares so that such Person would no
longer be an Acquiring Person, as defined pursuant to the foregoing provisions
of this Section 1.1, then such Person shall not be deemed to be or have become
an "Acquiring Person" at any time for any purposes of this Agreement. For all
purposes of this Agreement, any calculation of the number of Common Shares
outstanding at any particular time, including for purposes of determining the
particular percentage of such outstanding Common Shares 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 Securities
Exchange Act of 1934, as amended (the "Exchange Act"), as in effect on the date
of this Agreement.

                1.2. "Affiliate" and "Associate" shall have the respective
meanings ascribed to such terms in Rule 12b-2 of the General Rules and
Regulations, under the Exchange Act, as in effect on the date of this Agreement.

                1.3. 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 (as determined pursuant
to Rule 13d-3 of the General Rules and Regulations under the Exchange Act as in
effect on the date of this Agreement);

                        (ii) which such Person or any of such Person's
Affiliates or Associates, directly or indirectly, has (A) the right to acquire
(whether such right is exercisable immediately, or only after the passage of
time, compliance with regulatory requirements, fulfillment of a condition or
otherwise) pursuant to 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 upon the exercise of conversion rights, exchange rights, rights,
warrants or options, or otherwise; PROVIDED, HOWEVER, that a Person shall not be
deemed the Beneficial Owner of, or to beneficially own, (w) securities tendered
pursuant to a tender or exchange offer made by or on behalf of such Person or
any of such Person's Affiliates or Associates until such tendered securities are
accepted for purchase or exchange, (x) securities which such Person has a right
to acquire upon the exercise of Rights at any time prior to the time that any
Person becomes an Acquiring Person, (y) securities issuable upon the exercise of
Rights from and after the time that any Person becomes an Acquiring Person if
such Rights were acquired by such Person or any of such Person's Affiliates or
Associates prior to the Distribution Date or pursuant to Section 3.1 or Section
22 ("Original Rights") or pursuant to Section 11.9 or Section 11.15 with respect
to an adjustment to Original Rights or (z) securities which such Person or any
of such Person's Affiliates or Associates may acquire, does or do acquire or may
be deemed to acquire or may be deemed to have the right to acquire, pursuant to
any merger or other acquisition agreement between the Company and such Person
(or one or more of such Person's Affiliates or Associates) if prior to such
Person becoming an Acquiring Person the Board of Directors of the Company has
approved such agreement and determined that such Person shall not be or be
deemed to be the beneficial owner of such securities within the meaning of this
Section 1.3; or


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<PAGE>   4

(B) the right to vote pursuant to any agreement, arrangement or understanding
(whether or not in writing); PROVIDED, HOWEVER, that a Person shall not be
deemed the Beneficial Owner of, or to beneficially own, any security under this
clause (B) if the agreement, arrangement or understanding to vote such security
(1) arises solely from a revocable proxy or consent given to such Person 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 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) and with
respect to which such Person or any of such Person's Affiliates or Associates
has any agreement, arrangement or understanding (other than customary agreements
with and between underwriters and selling group members with respect to a bona
fide public offering of securities), whether or not in writing, for the purpose
of acquiring, holding, voting (except pursuant to a revocable proxy or consent
as described in the proviso to Section 1.3(ii)(B)) or disposing of any
securities of the Company;

PROVIDED, HOWEVER, that no Person who is an officer, director or employee of an
Exempt Person shall be deemed, solely by reason of such Person's status or
authority as such, to be the "Beneficial Owner" of, to have "Beneficial
Ownership" of or to "beneficially own" any securities that are "beneficially
owned" (as defined in this Section 1.3), including, without limitation, in a
fiduciary capacity, by an Exempt Person or by any other such officer, director
or employee of an Exempt Person.

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

                1.5. "close of business" on any given date shall mean 5:00 p.m.,
New York time, on such date; PROVIDED, HOWEVER, that if such date is not a
Business Day it shall mean 5:00 p.m., New York time, on the next succeeding
Business Day.

                1.6. "Common Shares" when used with reference to the Company
shall mean the shares of common stock, par value $.001 per share, of the
Company. "Common Shares" when used with reference to 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 other Person or, if such Person is a Subsidiary (as such
term is hereinafter defined) of another Person, the Person or Persons which
ultimately control such first-mentioned Person, and which has issued and
outstanding such capital stock, equity securities or equity interest.

                1.7. "Exempt Person" shall mean the Company, any Subsidiary of
the Company, in each case including, without limitation, its fiduciary capacity,
or any employee benefit plan of the Company or of any Subsidiary of the Company
or any entity or trustee holding shares of capital stock of the Company for or
pursuant to the terms of any such plan, or for the purpose of funding other
employee benefits for employees of the Company or any Subsidiary of the Company.



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<PAGE>   5



                1.8. "Person" shall mean any individual, partnership, joint
venture, limited liability company, firm, corporation, unincorporated
association, trust or other entity, and shall include any successor (by merger
or otherwise) of such entity.

                1.9. "Shares Acquisition Date" shall mean the first date of
public announcement (which, for purposes of this definition, shall include,
without limitation, the filing of a report pursuant to Section 13(d) of the
Exchange Act or pursuant to a comparable successor statute) by the Company or an
Acquiring Person that an Acquiring Person has become such or that discloses
information which reveals the existence of an Acquiring Person or such earlier
date as a majority of the Board of Directors shall become aware of the existence
of an Acquiring Person.

                1.10. "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 equity interests is owned, of record or beneficially, directly or
indirectly, by such Person.

                1.11. A "Trigger Event" shall be deemed to have occurred upon
any Person becoming an Acquiring Person.

                1.12. The following terms shall have the meanings defined for
such terms in the Sections set forth below:

<TABLE>
<CAPTION>
                      Term                                       Section
                      ----                                       -------
                      <S>                                        <C>
                      Adjustment Shares                          11.1.2
                      common stock equivalent                    11.1.3
                      Company                                    Recitals
                      current per share market price             11.4
                      Current Value                              11.1.3
                      Distribution Date                          3.1
                      equivalent preferred stock                 11.2
                      Exchange Act                               1.1
                      Exchange Consideration                     27
                      Expiration Date                            7.1
                      Final Expiration Date                      7.1
                      Nasdaq                                     9
                      Original Rights                            1.3
                      Preferred Shares                           Recitals
                      Principal Party                            13.2
                      Purchase Price                             4
                      Record Date                                Recitals
                      Redemption Date                            7.1
                      Redemption Price                           23.1
                      Right                                      Recitals
                      Right Certificate                          3.1
                      Rights Agent                               Recitals
                      Security                                   11.4
                      Spread                                     11.1.3

</TABLE>


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<PAGE>   6



<TABLE>
                      <S>                                        <C>
                      Substitution Period                        11.1.3
                      Summary of Rights                          3.2
                      Trading Day                                11.4

</TABLE>

        Section 2. Appointment of Rights Agent. The Company hereby appoints the
Rights Agent to act as agent for the Company and the holders of the Rights (who,
in accordance with Section 3, shall prior to the Distribution Date also be the
holders of the Common Shares) in accordance with the terms and conditions
hereof, and the Rights Agent hereby accepts such appointment. The Company may
from time to time appoint such co-Rights Agents as it may deem necessary or
desirable. In the event the Company appoints one or more co-Rights Agents, the
respective duties of the Rights Agent and any co-Rights Agent shall be as the
Company shall determine. Contemporaneously with such appointment, if any, the
Company shall notify the Rights Agent thereof.

        Section 3. Issuance of Right Certificates.

                3.1. Rights Evidenced by Share Certificates. Until the earlier
of (i) the tenth day after the Shares Acquisition Date or (ii) the tenth
Business Day after the date of the commencement of, or first public announcement
of the intent of any Person (other than an Exempt Person) to commence, a tender
or exchange offer the consummation of which would result in any Person (other
than an Exempt Person) becoming the Beneficial Owner of Common Shares
aggregating 15% or more of the then outstanding Common Shares of the Company
(the earlier of (i) and (ii) being herein referred to as the "Distribution
Date"), (x) the Rights (unless earlier expired, redeemed or terminated) will be
evidenced (subject to the provisions of Section 3.2) by the certificates for
Common Shares registered in the names of the holders thereof (which certificates
for Common Shares shall also be deemed to be Right Certificates) and not by
separate certificates, and (y) the Rights (and the right to receive certificates
therefor) will be transferable only in connection with the transfer of the
underlying Common Shares. The preceding sentence notwithstanding, prior to the
occurrence of a Distribution Date specified as a result of an event described in
clause (ii) (or such later Distribution Date as the Board of Directors of the
Company may select pursuant to this sentence), the Board of Directors may
postpone, one or more times, the Distribution Date which would occur as a result
of an event described in clause (ii) beyond the date set forth in such clause
(ii). Nothing herein shall permit such a postponement of a Distribution Date
after a Person becomes an Acquiring Person. As soon as practicable after the
Distribution Date, the Company will prepare and execute, the Rights Agent will
countersign and the Company (or, if requested, the Rights Agent) will send, by
first-class, postage-prepaid mail, to each record holder of Common Shares as of
the close of business on the Distribution Date (other than any Acquiring Person
or any Associate or Affiliate of an Acquiring Person), at the address of such
holder shown on the records of the Company, one or more certificates for Rights,
in substantially the form of Exhibit B hereto (a "Right Certificate"),
evidencing one Right (subject to adjustment as provided herein) for each Common
Share so held. As of the Distribution Date, the Rights will be evidenced solely
by such Right Certificates.

                3.2. Summary of Rights. On the Record Date or as soon as
practicable thereafter, the Company will send or cause to be sent a copy of a
Summary of Rights to Purchase Preferred Shares, in substantially the form
attached hereto as Exhibit C (the "Summary of Rights"), by first-class,
postage-prepaid mail, to each record holder of Common Shares as of the


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<PAGE>   7


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 Common Shares
outstanding as of the close of business on the Record Date, until the
Distribution Date (or the earlier Expiration Date), the Rights will be evidenced
by such certificates for Common Shares registered in the names of the holders
thereof together with a copy of the Summary of Rights and the registered holders
of the Common Shares shall also be registered holders of the associated Rights.
Until the Distribution Date (or the earlier Expiration Date), the surrender for
transfer of any certificate for Common Shares outstanding at the close of
business on the Record Date, with or without a copy of the Summary of Rights,
shall also constitute the transfer of the Rights associated with the Common
Shares represented thereby.

                3.3. New Certificates After Record Date. Certificates for Common
Shares which become outstanding (whether upon issuance out of authorized but
unissued Common Shares, disposition out of treasury or transfer or exchange of
outstanding Common Shares) after the Record Date but prior to the earliest of
the Distribution Date or the Expiration Date, 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 an Agreement between Geron Corporation
        (the "Company") and U.S. Stock Transfer Corporation, as Rights Agent,
        dated as of July 20, 2001, as the same may be amended from time to time
        (the "Agreement"), the terms of which are hereby incorporated herein by
        reference and a copy of which is on file at the principal executive
        offices of the Company. Under certain circumstances, as set forth in the
        Agreement, such Rights will 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 Agreement without charge
        after receipt of a written request therefor. AS DESCRIBED IN THE
        AGREEMENT, RIGHTS WHICH ARE OWNED BY, TRANSFERRED TO OR HAVE BEEN OWNED
        BY ACQUIRING PERSONS OR ASSOCIATES OR AFFILIATES THEREOF (AS DEFINED IN
        THE AGREEMENT) SHALL BECOME NULL AND VOID AND WILL NO LONGER BE
        TRANSFERABLE.

With respect to such certificates containing the foregoing legend, until the
Distribution Date (or the earlier Expiration Date), the Rights associated with
the Common Shares represented by such certificates shall be evidenced by such
certificates alone, and the surrender for transfer of any such certificates,
except as otherwise provided herein, shall also constitute the transfer of the
Rights associated with the Common Shares represented thereby. In the event that
the Company purchases or acquires any Common Shares after the Record Date but
prior to the Distribution Date, any Rights associated with such Common Shares
shall be deemed canceled and retired so that the Company shall not be entitled
to exercise any Rights associated with the Common Shares which are no longer
outstanding.

        Notwithstanding this Section 3.3, the omission of a legend shall not
affect the enforceability of any part of this Agreement or the rights of any
holder of the Rights.

        Section 4. Form of Right Certificates. The Right Certificates (and the
forms of election to purchase shares, certification and assignment to be printed
on the reverse thereof) shall be substantially the same as Exhibit B hereto and
may have such marks of identification or


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<PAGE>   8



designation and such legends, summaries or endorsements printed thereon as the
Company may deem appropriate and as are not inconsistent with the provisions of
this Agreement, or as may be required to comply with any applicable law or with
any rule or regulation made pursuant thereto or with any rule or regulation of
any stock exchange or trading system on which the Rights may from time to time
be listed or quoted, or to conform to usage. Subject to the terms and conditions
hereof, the Right Certificates, whenever issued, shall be dated as of the Record
Date, and shall show the date of countersignature by the Rights Agent, and on
their face shall entitle the holders thereof to purchase such number of one
one-thousandths of a Preferred Share as shall be set forth therein at the price
per one one-thousandth of a Preferred Share set forth therein (the "Purchase
Price"), but the number of such one one-thousandths of a Preferred Share and the
Purchase Price shall be subject to adjustment as provided herein.

        Section 5. Countersignature and Registration. The Right Certificates
shall be executed on behalf of the Company by its Chairman of the Board of
Directors, the Chief Executive Officer, 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 any
Assistant Secretary of the Company, either manually or by facsimile signature.
The Right Certificates shall be countersigned, either manually or by facsimile
signature, by an authorized signatory of the Rights Agent, but it shall not be
necessary for the same signatory to countersign all of the Right Certificates
hereunder. No Right Certificate shall be valid for any purpose unless so
countersigned. In case any officer of the Company who shall have signed any of
the Right Certificates shall cease to be such officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Right 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 Right Certificates had not ceased to be such officer
of the Company; and any Right Certificate may be signed on behalf of the Company
by any person who, at the actual date of the execution of such Right
Certificate, shall be a proper officer of the Company to sign such Right
Certificate, although at the date of the execution of this 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 principal office, books for registration and transfer of the
Right Certificates issued hereunder. Such books shall show the names and
addresses of the respective holders of the Right Certificates, the number of
Rights evidenced on its face by each of the Right Certificates, the certificate
number of each of the Right Certificates and the date of each of the Right
Certificates.

        Section 6. Transfer, Split Up, Combination and Exchange of Right
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates. Subject
to the provisions of Section 11.1.2 and Section 14, 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 Right Certificate or Right Certificates (other than
Right Certificates representing Rights that have become void pursuant to Section
11.1.2 or that have been exchanged pursuant to Section 27) may be transferred,
split up or combined or exchanged for another Right Certificate or Right
Certificates, entitling the registered holder to purchase a like number of one
one-thousandths of a Preferred Share as the Right Certificate or Right
Certificates surrendered then entitled such holder to purchase. Any registered
holder desiring to transfer, split up or combine or exchange any Right
Certificate shall make such request in writing delivered to the Rights Agent,
and shall surrender, together with


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<PAGE>   9



any required form of assignment and certificate duly completed, the Right
Certificate or Right Certificates to be transferred, split up or combined or
exchanged at the office of the Rights Agent designated for such purpose. Neither
the Rights Agent nor the Company shall be obligated to take any action
whatsoever with respect to the transfer of any such surrendered Right
Certificate or Right Certificates until the registered holder shall have
completed and signed the certificate contained in the form of assignment on the
reverse side of such Right Certificate or Right Certificates and shall have
provided such additional evidence of the identity of the Beneficial Owner (or
former Beneficial Owner) or Affiliates or Associates thereof as the Company
shall reasonably request. Thereupon the Rights Agent shall countersign and
deliver to the person entitled thereto a Right Certificate or Right
Certificates, as the case may be, as so requested. The Company may require
payment from the holders of Right Certificates of a sum sufficient to cover any
tax or governmental charge that may be imposed in connection with any transfer,
split up or combination or exchange of such Right Certificates.

        Subject to the provisions of Section 11.1.2 , at any time after the
Distribution Date and prior to the Expiration Date, upon receipt by the Company
and the Rights Agent of evidence reasonably satisfactory to them of the loss,
theft, destruction or mutilation of a Right Certificate, and, in case of loss,
theft or destruction, of indemnity or security reasonably satisfactory to them,
and, at the Company's request, 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 Right Certificate if mutilated, the Company will
make and deliver a new Right Certificate of like tenor to the Rights Agent for
countersignature and delivery to the registered owner in lieu of the Right
Certificate so lost, stolen, destroyed or mutilated.

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

               7.1. Exercise of Rights. Subject to Section 11.1.2 and except as
otherwise provided herein, the registered holder of any Right Certificate may
exercise the Rights evidenced thereby in whole or in part at any time after the
Distribution Date upon surrender of the Right Certificate, with the form of
election to purchase and certification on the reverse side thereof duly
executed, to the Rights Agent at the office of the Rights Agent designated for
such purpose, together with payment of the aggregate Purchase Price for the
total number of one one-thousandths of a Preferred Share (or other securities,
cash or other assets) as to which the Rights are exercised, at or prior to the
time (the "Expiration Date") that is the earliest of (i) the close of business
on July 31, 2011 (the "Final Expiration Date"), (ii) the time at which the
Rights are redeemed as provided in Section 23 (the "Redemption Date"), (iii) the
closing of any merger or other acquisition transaction involving the Company
pursuant to an agreement of the type described in Section 13.3 at which time the
Rights are deemed terminated, or (iv) the time at which the Rights are exchanged
as provided in Section 27.

               7.2. Purchase. The Purchase Price for each one one-thousandth of
a Preferred Share pursuant to the exercise of a Right shall be initially
$100.00, shall be subject to adjustment from time to time as provided in
Sections 11, 13 and 26 and shall be payable in lawful money of the United States
of America in accordance with Section 7.3.

                7.3. Payment Procedures. Upon receipt of a Right Certificate
representing exercisable Rights, with the form of election to purchase and
certification duly executed,


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<PAGE>   10


accompanied by payment of the aggregate Purchase Price for the total number of
one one-thousandths of a Preferred Share to be purchased and an amount equal to
any applicable transfer tax required to be paid by the holder of such Right
Certificate in accordance with Section 9, in cash or by certified or cashier's
check or money order payable to the order of the Company, the Rights Agent shall
thereupon promptly (i)(A) requisition from any transfer agent of the Preferred
Shares (or make available, if the Rights Agent is the transfer agent)
certificates for the number of Preferred Shares to be purchased and the Company
hereby irrevocably authorizes its transfer agent to comply with all such
requests, or (B) if the Company shall have elected to deposit the total number
of Preferred Shares issuable upon exercise of the Rights hereunder with a
depository agent, requisition from the depositary agent depositary receipts
representing interests in such number of one one-thousandths of a Preferred
Share as are to be purchased (in which case certificates for the Preferred
Shares represented by such receipts shall be deposited by the transfer agent
with the depositary agent) and the Company hereby directs the depositary agent
to comply with all such requests, (ii) when appropriate, requisition from the
Company the amount of cash to be paid in lieu of the issuance of fractional
shares in accordance with Section 14 or otherwise in accordance with Section
11.1.3, (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 Right 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 Right
Certificate. In the event that the Company is obligated to issue other
securities of the Company, pay cash and/or distribute other property pursuant to
Section 11.1.3, the Company will make all arrangements necessary so that such
other securities, cash and/or other property are available for distribution by
the Rights Agent, if and when appropriate.

               7.4. Partial Exercise. In case the registered holder of any Right
Certificate shall exercise less than all the Rights evidenced thereby, a new
Right Certificate evidencing Rights equivalent to the Rights remaining
unexercised shall be issued by the Rights Agent and delivered to the registered
holder of such Right Certificate or to his duly authorized assigns, subject to
the provisions of Section 14.

               7.5. Full Information Concerning Ownership. 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 of Rights upon the occurrence of any purported exercise as set forth in
this Section 7 unless the certificate contained in the form of election to
purchase set forth on the reverse side of the Right Certificate surrendered for
such exercise shall have been duly completed and signed 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.

        Section 8. Cancellation and Destruction of Right Certificates. All Right
Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Right
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Right


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Certificate purchased or acquired by the Company otherwise than upon the
exercise thereof. The Rights Agent shall deliver all canceled Right Certificates
to the Company within eighteen months after cancellation of the Certificates.
The Company may then destroy the Certificates after any retention period
required by the Securities and Exchange Commission.

        Section 9. Reservation and Availability of Capital Stock. The Company
covenants and agrees that from and after the Distribution Date it will cause to
be reserved and kept available out of its authorized and unissued Preferred
Shares (and, following the occurrence of a Trigger Event, out of its authorized
and unissued Common Shares or other securities or out of its shares held in its
treasury) the number of Preferred Shares (and, following the occurrence of a
Trigger Event, Common Shares and/or other securities) that will be sufficient to
permit the exercise in full of all outstanding Rights.

        So long as the Preferred Shares (and, following the occurrence of a
Trigger Event, Common Shares and/or other securities) issuable upon the exercise
of Rights may be listed on any national securities exchange or traded in the
over-the-counter market and quoted on the National Association of Securities
Dealers, Inc. Automated Quotation System ("Nasdaq") (including the National
Market or Small Cap Market), the Company shall use its best efforts to cause,
from and after such time as the Rights become exercisable, all shares reserved
for such issuance to be listed or admitted to trading on such exchange or quoted
on Nasdaq upon official notice of issuance upon such exercise.

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

        From and after such time as the Rights become exercisable, the Company
shall use its best efforts, if then necessary to permit the issuance of
Preferred Shares upon the exercise of Rights, to register and qualify such
Preferred Shares under the Securities Act and any applicable state securities or
"Blue Sky" laws (to the extent exemptions therefrom are not available), cause
such registration statement and qualifications to become effective as soon as
possible after such filing and keep such registration and qualifications
effective until the earlier of the date as of which the Rights are no longer
exercisable for such securities and the Expiration Date. The Company may
temporarily suspend, for a period of time not to exceed 90 days, the
exercisability of the Rights in order to prepare and file a registration
statement under the Securities Act and permit it to become effective. Upon any
such suspension, the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended, as well as a public
announcement at such time as the suspension is no longer in effect.
Notwithstanding any provision of this Agreement to the contrary, the Rights
shall not be exercisable in any jurisdiction unless the requisite qualification
in such jurisdiction shall have been obtained and until a registration statement
under the Securities Act (if required) shall have been declared effective.

        The Company further covenants and agrees that it will pay when due and
payable any and all Federal and state transfer taxes and charges which may be
payable in respect of the


                                       10
<PAGE>   12


issuance or delivery of the Right Certificates or of any Preferred Shares (or
Common Shares and/or other securities, as the case may be) upon the exercise of
Rights. The Company shall not, however, be required to pay any transfer tax
which may be payable in respect of any transfer or delivery of Right
Certificates to a person other than, or the issuance or delivery of certificates
for the Preferred Shares (or Common Shares and/or other securities, as the case
may be) in a name other than that of, the registered holder of the Right
Certificate evidencing Rights surrendered for exercise or to issue or deliver
any certificates for Preferred Shares (or Common Shares and/or other securities,
as the case may be) in a name other than that of the registered holder upon the
exercise of any Rights until any such tax shall have been paid (any such tax
being payable by the holder of such Right Certificate at the time of surrender)
or until it has been established to the Company's satisfaction that no such tax
is due.

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

        Section 11. Adjustment of Purchase Price, Number of Shares or Number of
Rights. The Purchase Price, the number of Preferred Shares or other securities
or property purchasable upon exercise of each Right and the number of Rights
outstanding are subject to adjustment from time to time as provided in this
Section 11.

                11.1. Post-Execution Events.

                        11.1.1. Corporate Dividends, Reclassifications, Etc. In
the event the Company shall at any time after the date of this Agreement (A)
declare and pay a dividend on the Preferred Shares payable in Preferred Shares,
(B) subdivide the outstanding Preferred Shares, (C) combine the outstanding
Preferred Shares into a smaller number of Preferred Shares or (D) issue any
shares of its capital stock in a reclassification of the Preferred Shares
(including any such reclassification in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation), except
as otherwise provided in this Section 11.1, 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


                                       11
<PAGE>   13


exercised after such time shall be entitled to receive the aggregate number and
kind of shares of capital stock which, if such Right had been exercised
immediately prior to such date and at a time when the Preferred Shares transfer
books of the Company were open, he would have owned upon such exercise and been
entitled to receive by virtue of such dividend, subdivision, combination or
reclassification; PROVIDED, HOWEVER, that in no event shall the consideration to
be paid upon the exercise of one Right be less than the aggregate par value of
the shares of capital stock of the Company issuable upon exercise of one Right.
If an event occurs which would require an adjustment under both Section 11.1.1
and Section 11.1.2, the adjustment provided for in this Section 11.1.1 shall be
in addition to, and shall be made prior to, the adjustment required pursuant to,
Section 11.1.2.

                        11.1.2. Acquiring Person Events; Triggering Events.
Subject to Sections 23.1 and 27, in the event that a Trigger Event occurs, then,
from and after the first occurrence of such event, each holder of a Right,
except as provided below, shall thereafter have a right to receive, upon
exercise thereof at a price per Right equal to the then current Purchase Price
multiplied by the number of one one-thousandths of a Preferred Share for which a
Right is then exercisable (without giving effect to this Section 11.1.2), in
accordance with the terms of this Agreement and in lieu of Preferred Shares,
such number of Common Shares as shall equal the result obtained by (x)
multiplying the then current Purchase Price by the then number of one
one-thousandths of a Preferred Share for which a Right is then exercisable
(without giving effect to this Section 11.1.2) and (y) dividing that product by
50% of the current per share market price of the Common Shares (determined
pursuant to Section 11.4) on the first of the date of the occurrence of, or the
date of the first public announcement of, a Trigger Event (the "Adjustment
Shares"); PROVIDED that the Purchase Price and the number of Adjustment Shares
shall thereafter be subject to further adjustment as appropriate in accordance
with Section 11.6. Notwithstanding the foregoing, upon the occurrence of a
Trigger Event, any Rights that are or were acquired or beneficially owned by (1)
any Acquiring Person or any Associate or Affiliate thereof, (2) a transferee of
any Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee after the Acquiring Person becomes such, or (3) a transferee of any
Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee prior to or concurrently with the Acquiring Person becoming such and
receives such Rights pursuant to either (A) a transfer (whether or not for
consideration) from the Acquiring Person to holders of equity interests in such
Acquiring Person or to any Person with whom the Acquiring Person has any
continuing agreement, arrangement or understanding regarding the transferred
Rights or (B) a transfer which the Board of Directors of the Company has
determined is part of a plan, arrangement or understanding which has as a
primary purpose or effect avoidance of this Section 11.1.2, and subsequent
transferees, shall become void without any further action, and any holder
(whether or not such holder is an Acquiring Person or an Associate or Affiliate
of an Acquiring Person) of such Rights shall thereafter have no right to
exercise such Rights under any provision of this Agreement or otherwise. From
and after the Trigger Event, no Right Certificate shall be issued pursuant to
Section 3 or Section 6 that represents Rights that are or have become void
pursuant to the provisions of this paragraph, and any Right Certificate
delivered to the Rights Agent that represents Rights that are or have become
void pursuant to the provisions of this paragraph shall be canceled.

        The Company shall use all reasonable efforts to ensure that the
provisions of this Section 11.1.2 are complied with, but shall have no liability
to any holder of Right Certificates or other


                                       12
<PAGE>   14


Person as a result of its failure to make any determinations with respect to any
Acquiring Person or its Affiliates, Associates or transferees hereunder.

        From and after the occurrence of an event specified in Section 13.1, any
Rights that theretofore have not been exercised pursuant to this Section 11.1.2
shall thereafter be exercisable only in accordance with Section 13 and not
pursuant to this Section 11.1.2.

                        11.1.3. Insufficient Shares. The Company may at its
option substitute for a Common Share issuable upon the exercise of Rights in
accordance with the foregoing Section 11.1.2 a number of Preferred Shares or
fraction thereof such that the current per share market price of one Preferred
Share multiplied by such number or fraction is equal to the current per share
market price of one Common Share. In the event that upon the occurrence of a
Trigger Event there shall not be sufficient Common Shares authorized but
unissued, or held by the Company as treasury shares, to permit the exercise in
full of the Rights in accordance with the foregoing Section 11.1.2, the Company
shall take all such action as may be necessary to authorize additional Common
Shares for issuance upon exercise of the Rights, PROVIDED, HOWEVER, that if the
Company determines that it is unable to cause the authorization of a sufficient
number of additional Common Shares, then, in the event the Rights become
exercisable, the Company, with respect to each Right and to the extent necessary
and permitted by applicable law and any agreements or instruments in effect on
the date hereof to which it is a party, shall: (A) determine the excess of (1)
the value of the Adjustment Shares issuable upon the exercise of a Right (the
"Current Value"), over (2) the Purchase Price (such excess, the "Spread") and
(B) with respect to each Right (other than Rights which have become void
pursuant to Section 11.1.2), make adequate provision to substitute for the
Adjustment Shares, upon payment of the applicable Purchase Price, (1) cash, (2)
a reduction in the Purchase Price, (3) Preferred Shares or other equity
securities of the Company (including, without limitation, shares, or fractions
of shares, of preferred stock which, by virtue of having dividend and
liquidation rights substantially comparable to those of the Common Shares, the
Board of Directors of the Company has deemed in good faith to have substantially
the same value as Common Shares) (each such share of preferred stock or
fractions of shares of preferred stock constituting a "common stock
equivalent"), (4) debt securities of the Company, (5) other assets or (6) any
combination of the foregoing having an aggregate value equal to the Current
Value, 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 in good faith by the Board of Directors of the Company;
PROVIDED, HOWEVER, that if the Company shall not have made adequate provision to
deliver value pursuant to clause (B) above within thirty (30) days following the
occurrence of a Trigger Event, then the Company shall be obligated to deliver,
to the extent necessary and permitted by applicable law and any agreements or
instruments in effect on the date hereof to which it is a party, upon the
surrender for exercise of a Right and without requiring payment of the Purchase
Price, Common Shares (to the extent available) and then, if necessary, such
number or fractions of Preferred Shares (to the extent available) and then, if
necessary, cash, which shares and/or cash have an aggregate value equal to the
Spread. If the Board of Directors of the Company shall determine in good faith
that it is unlikely that sufficient additional Common Shares could be authorized
for issuance upon exercise in full of the Rights, the thirty (30) day period set
forth above may be extended and re-extended to the extent necessary, but not
more than ninety (90) days following the occurrence of a Trigger Event, in order
that the Company may seek stockholder approval for the authorization


                                       13
<PAGE>   15


of such additional shares (such period as may be extended, the "Substitution
Period"). To the extent that the Company determines that some action need be
taken pursuant to the second and/or third sentences of this Section 11.1.3, the
Company (x) shall provide that such action shall apply uniformly to all
outstanding Rights, and (y) may suspend the exercisability of the Rights until
the expiration of the Substitution Period in order to seek any authorization of
additional shares and/or to decide the appropriate form of distribution to be
made pursuant to such first sentence and to determine the value thereof. In the
event of any such suspension, the Company shall issue a public announcement
stating that the exercisability of the Rights has been temporarily suspended as
well as a public announcement at such time as the suspension is no longer in
effect. For purposes of this Section 11.1.3, the value of a Common Share shall
be the current per share market price (as determined pursuant to Section 11.4)
on the date of the occurrence of a Trigger Event and the value of any "common
stock equivalent" shall be deemed to have the same value as the Common Shares on
such date. The Board of Directors of the Company may, but shall not be required
to, establish procedures to allocate the right to receive Common Shares upon the
exercise of the Rights among holders of Rights pursuant to this Section 11.1.3.

                11.2. Dilutive Rights Offering. In case the Company shall fix a
        record date for the issuance of rights, options or warrants to all
        holders of Preferred Shares entitling them (for a period expiring within
        45 calendar days after such record date) to subscribe for or purchase
        Preferred Shares (or securities having the same rights, privileges and
        preferences as the Preferred Shares ("equivalent preferred stock")) or
        securities convertible into Preferred Shares or equivalent preferred
        stock at a price per Preferred Share or per share of equivalent
        preferred stock (or having a conversion or exercise price per share, if
        a security convertible into or exercisable for Preferred Shares or
        equivalent preferred stock) less than the current per share market price
        of the Preferred Shares (as determined pursuant to Section 11.4) 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 Preferred Shares and shares of equivalent
        preferred stock outstanding on such record date plus the number of
        Preferred Shares and shares of equivalent preferred stock which the
        aggregate offering price of the total number of Preferred Shares and/or
        shares of equivalent preferred stock to be offered (and/or the aggregate
        initial conversion price of the convertible securities so to be offered)
        would purchase at such current per share market price and the
        denominator of which shall be the number of Preferred Shares and shares
        of equivalent preferred stock outstanding on such record date plus the
        number of additional Preferred Shares and/or shares of equivalent
        preferred stock to be offered for subscription or purchase (or into
        which the convertible securities so to be offered are initially
        convertible); PROVIDED, HOWEVER, that in no event shall the
        consideration to be paid upon the exercise of one Right be less than the
        aggregate par value of the shares of capital stock of the Company
        issuable upon exercise of one Right. 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 as determined in
        good faith by the Board of Directors of the Company, whose determination
        shall be described in a statement filed with the Rights Agent and shall
        be binding on the Rights Agent and the holders of the Rights. Preferred
        Shares and shares of equivalent preferred stock owned by or held for the
        account of the Company or any Subsidiary of the Company shall not be
        deemed outstanding for the purpose of any such computation. Such
        adjustments shall be made successively whenever such a record date is
        fixed; and in the event that such rights or warrants are not so issued,
        the


                                       14
<PAGE>   16


Purchase Price shall be adjusted to be the Purchase Price which would then be in
effect if such record date had not been fixed.

                11.3. Distributions. In case the Company shall fix a record date
for the making of a distribution to all holders of the Preferred Shares
(including any such distribution made in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation) of
evidences of indebtedness, cash, securities or assets (other than a regular
periodic cash dividend at a rate not in excess of 125% of the rate of the last
regular periodic cash dividend theretofore paid or, in case regular periodic
cash dividends have not theretofore been paid, at a rate not in excess of 50% of
the average net income per share of the Company for the four quarters ended
immediately prior to the payment of such dividend, or a dividend payable in
Preferred Shares (which dividend, for purposes of this Agreement, shall be
subject to the provisions of Section 11.1.1(A))) or convertible securities, or
subscription rights or warrants (excluding those referred to in Section 11.2),
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 per share market
price of the Preferred Shares (as determined pursuant to Section 11.4) on such
record date, less the fair market value (as determined in good faith by the
Board of Directors of the Company, whose determination shall be described in a
statement filed with the Rights Agent) of the portion of the cash, assets,
securities or evidences of indebtedness so to be distributed or of such
subscription rights or warrants applicable to one Preferred Share and the
denominator of which shall be such current per share market price of the
Preferred Shares (as determined pursuant to Section 11.4); PROVIDED, HOWEVER,
that in no event shall the consideration to be paid upon the exercise of one
Right be less than the aggregate par value of the shares of capital stock of the
Company to be issued upon exercise of one Right. 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 then be in effect if such record date had not
been fixed.

                11.4. Current Per Share Market Value.

                        11.4.1. General. For the purpose of any computation
hereunder, the "current per share market price" of any security (a "Security"
for the purpose of this Section 11.4.1) on any date shall be deemed to be the
average of the daily closing prices per share of such Security for the thirty
(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 Security is determined during any period following the
announcement by the issuer of such Security of (i) a dividend or distribution on
such Security payable in shares of such Security or securities convertible into
such shares or (ii) any subdivision, combination or reclassification of such
Security, and prior to the expiration of thirty (30) Trading Days after the
ex-dividend date for such dividend or distribution, or the record date for such
subdivision, combination or reclassification, then, and in each such case, the
"current per share market price" shall be appropriately adjusted to reflect the
current market price per share equivalent of such Security. 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 Security is


                                       15
<PAGE>   17


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
Security is listed or admitted to trading or, if the Security is not listed or
admitted to trading on any national securities exchange, the last quoted price
or, if not so quoted, the average of the high bid and low asked prices in the
over-the-counter market, as reported by Nasdaq or such other system then in use,
or, if on any such date the Security is 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 Security selected by the Board of Directors
of the Company. If on any such date no such market maker is making a market in
the Security, the fair value of the Security on such date as determined in good
faith by the Board of Directors of the Company shall be used. The term "Trading
Day" shall mean a day on which the principal national securities exchange on
which the Security is listed or admitted to trading is open for the transaction
of business or, if the Security is not listed or admitted to trading on any
national securities exchange, a Business Day. If the Security is not publicly
held or not so listed or traded, or if on any such date the Security is not so
quoted and no such market maker is making a market in the Security, "current per
share market price" shall mean the fair value per share as determined in good
faith by the Board of Directors of the Company or, if at the time of such
determination there is an Acquiring Person, by a nationally recognized
investment banking firm selected by the Board of Directors, which shall have the
duty to make such determination in a reasonable and objective manner, whose
determination shall be described in a statement filed with the Rights Agent and
shall be conclusive for all purposes.

                        11.4.2. Preferred Shares. Notwithstanding Section
11.4.1, for the purpose of any computation hereunder, the "current per share
market price" of the Preferred Shares shall be determined in the same manner as
set forth above in Section 11.4.1 (other than the last sentence thereof). If the
current per share market price of the Preferred Shares cannot be determined in
the manner described in Section 11.4.1, the "current per share market price" of
the Preferred Shares shall be conclusively deemed to be an amount equal to 1,000
(as such number may be appropriately adjusted for such events as stock splits,
stock dividends and recapitalizations with respect to the Common Shares
occurring after the date of this Agreement) multiplied by the current per share
market price of the Common Shares (as determined pursuant to Section 11.4.1). If
neither the Common Shares nor the Preferred Shares are publicly held or so
listed or traded, or if on any such date neither the Common Shares nor the
Preferred Shares are so quoted and no such market maker is making a market in
either the Common Shares or the Preferred Shares, "current per share market
price" of the Preferred Shares shall mean the fair value per share as determined
in good faith by the Board of Directors of the Company, or, if at the time of
such determination there is an Acquiring Person, by a nationally recognized
investment banking firm selected by the Board of Directors of the Company, which
shall have the duty to make such determination in a reasonable and objective
manner, which determination shall be described in a statement filed with the
Rights Agent and shall be conclusive for all purposes. For purposes of this
Agreement, the "current per share market price" of one one-thousandth of a
Preferred Share shall be equal to the "current per share market price" of one
Preferred Share divided by 1,000.

                11.5. Insignificant Changes. 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. Any adjustments which by reason of this
Section 11.5 are not required to be


                                       16
<PAGE>   18



made shall be carried forward and taken into account in any subsequent
adjustment. All calculations under this Section 11 shall be made to the nearest
cent or to the nearest one-hundred thousandth of a Preferred Share or the
nearest one-hundredth of a Common Share or other share or security, as the case
may be.

                11.6. Shares Other Than Preferred Shares. If as a result of an
adjustment made pursuant to Section 11.1, the holder of any Right thereafter
exercised shall become entitled to receive any shares of capital stock of the
Company other than Preferred Shares, thereafter the number of such other shares
so receivable 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 Preferred Shares contained in Sections 11.1,
11.2, 11.3, 11.5, 11.8, 11.9 and 11.13, and the provisions of Sections 7, 9, 10,
13 and 14 with respect to the Preferred Shares shall apply on like terms to any
such other shares.

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

                11.8. Effect of Adjustments. Unless the Company shall have
exercised its election as provided in Section 11.9, upon each adjustment of the
Purchase Price as a result of the calculations made in Sections 11.2 and 11.3,
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 Preferred Share (calculated to the nearest
one-hundred thousandth of a Preferred Share) obtained by (i) multiplying (x) the
number of one one-thousandths of a Preferred Share covered by a Right
immediately prior to this adjustment by (y) the Purchase Price in effect
immediately prior to such adjustment of the Purchase Price and (ii) dividing the
product so obtained by the Purchase Price in effect immediately after such
adjustment of the Purchase Price.

                11.9. Adjustment in Number of Rights. 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 one
one-thousandths of a Preferred Share issuable upon the exercise of a Right. Each
of the Rights outstanding after such adjustment of the number of Rights shall be
exercisable for the number of one one-thousandths of a Preferred Share 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-thousandth) obtained by dividing the
Purchase Price in effect immediately prior to adjustment of the Purchase Price
by the Purchase Price in effect immediately after adjustment of the Purchase
Price. The Company shall make a public announcement of its election to adjust
the number of Rights, indicating the record date for the adjustment, and, if
known at the time, the amount of the adjustment to be made. This record date may
be the date on which the Purchase Price is adjusted or any day thereafter, but,
if the Right Certificates have been issued, shall be at least ten (10) days
later than the date of the public announcement. If Right Certificates have been
issued, upon each adjustment of the number of Rights pursuant to this Section
11.9, the Company may, as promptly as practicable, cause to be distributed to
holders of record of Right


                                       17
<PAGE>   19


Certificates on such record date Right Certificates evidencing, subject to
Section 14, 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
Right Certificates held by such holders prior to the date of adjustment, and
upon surrender thereof, if required by the Company, new Right Certificates
evidencing all the Rights to which such holders shall be entitled after such
adjustment. Right 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 Right Certificates on the record date
specified in the public announcement.

               11.10. Right Certificates Unchanged. Irrespective of any
adjustment or change in the Purchase Price or the number of one one-thousandths
of a Preferred Share issuable upon the exercise of the Rights, the Right
Certificates theretofore and thereafter issued may continue to express the
Purchase Price per share and the number of one one-thousandths of a Preferred
Share which were expressed in the initial Right Certificates issued hereunder.

               11.11. Par Value Limitations. Before taking any action that would
cause an adjustment reducing the Purchase Price below one one-thousandth of the
then par value, if any, of the Preferred Shares or other shares of capital stock
issuable upon exercise of the Rights, the Company shall take any corporate
action which may, in the opinion of its counsel, be necessary in order that the
Company may validly and legally issue fully paid and nonassessable Preferred
Shares or other such shares at such adjusted Purchase Price.

               11.12. Deferred Issuance. In any case in which this Section 11
shall require that an adjustment in the Purchase Price be made effective as of a
record date for a specified event, the Company may elect to defer until the
occurrence of such event the issuance to the holder of any Right exercised after
such record date of that number of Preferred Shares and shares of other capital
stock or securities of the Company, if any, issuable upon such exercise over and
above the Preferred Shares and shares of other capital stock or other
securities, assets or cash 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.

               11.13. Reduction in Purchase Price. Anything in this Section 11
to the contrary notwithstanding, the Company shall be entitled to make such
reductions in the Purchase Price, in addition to those adjustments expressly
required by this Section 11, as and to the extent that it in its sole discretion
shall determine to be advisable in order that any consolidation or subdivision
of the Preferred Shares, issuance wholly for cash of any of the Preferred Shares
at less than the current market price, issuance wholly for cash of Preferred
Shares or securities which by their terms are convertible into or exchangeable
for Preferred Shares, dividends on Preferred Shares payable in Preferred Shares
or issuance of rights, options or warrants referred to hereinabove in this
Section 11, hereafter made by the Company to holders of its Preferred Shares
shall not be taxable to such stockholders.



                                       18
<PAGE>   20


               11.14. Company Not to Diminish Benefits of Rights. The Company
covenants and agrees that after the earlier of the Shares Acquisition Date or
Distribution Date it will not, except as permitted by Section 23, Section 26 or
Section 27, take (or permit any Subsidiary to take) any action if at the time
such action is taken it is reasonably foreseeable that such action will
substantially diminish or otherwise eliminate the benefits intended to be
afforded by the Rights.

               11.15. Adjustment of Rights Associated with Common Shares.
Notwithstanding anything contained in this Agreement to the contrary, in the
event that the Company shall at any time after the date hereof and prior to the
Distribution Date (i) declare or pay any dividend on the outstanding Common
Shares payable in Common Shares, (ii) effect a subdivision or consolidation of
the outstanding Common Shares (by reclassification or otherwise than by the
payment of dividends payable in Common Shares), or (iii) combine the outstanding
Common Shares into a greater or lesser number of Common Shares, then in any such
case, the number of Rights associated with each Common Share then outstanding,
or issued or delivered thereafter but prior to the Distribution Date or in
accordance with Section 22 shall be proportionately adjusted so that the number
of Rights thereafter associated with each Common Share following any such event
shall equal the result obtained by multiplying the number of Rights associated
with each Common Share immediately prior to such event by a fraction, the
numerator of which shall be the total number of Common Shares outstanding
immediately prior to the occurrence of the event and the denominator of which
shall be the total number of Common Shares outstanding immediately following the
occurrence of such event. The adjustments provided for in this Section 11.15
shall be made successively whenever such a dividend is declared or paid or such
a subdivision, combination or consolidation is effected.

        Section 12. Certificate of Adjusted Purchase Price or Number of Shares.
Whenever an adjustment is made as provided in Sections 11 or 13, 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 Common Shares or the
Preferred Shares a copy of such certificate and (c) mail a brief summary thereof
to each holder of a Right Certificate in accordance with Section 25. 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
such adjustment unless and until it shall have received such certificate.

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

               13.1. Certain Transactions. In the event that, from and after
the first occurrence of a Trigger Event, directly or indirectly, (A) the Company
shall consolidate with, or merge with and into, any other Person and the Company
shall not be the continuing or surviving corporation, (B) 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 and, in
connection with such merger, all or part of the Common Shares shall be changed
into or exchanged for stock or other securities of the Company or any other
Person or cash or any other property, or (C) the Company shall sell, exchange,
mortgage or otherwise transfer (or one or more of its Subsidiaries shall sell,
exchange, mortgage or otherwise transfer), in one or more transactions, assets
or earning power aggregating 50% or more of the assets or earning power of the
Company and its


                                       19
<PAGE>   21


Subsidiaries (taken as a whole) to any other Person or Persons (other than the
Company or one or more wholly-owned Subsidiaries of the Company in one or more
transactions each of which complies with Section 11.14), then, and in each such
case, proper provision shall be made so that (i) each holder of a Right (other
than Rights which have become void pursuant to Section 11.1.2) shall thereafter
have the right to receive, upon the exercise thereof at a price per Right equal
to the then current Purchase Price multiplied by the number of one
one-thousandths of a Preferred Share for which a Right was exercisable
immediately prior to the first occurrence of a Trigger Event (as subsequently
adjusted pursuant to Sections 11.1.1, 11.2, 11.3, 11.8, 11.9 and 11.12), in
accordance with the terms of this Agreement and in lieu of Preferred Shares or
Common Shares, such number of validly authorized and issued, fully paid,
non-assessable and freely tradable Common Shares of the Principal Party (as such
term is hereinafter defined) not subject to any liens, encumbrances, rights of
first refusal or other adverse claims, as shall be equal to the result obtained
by (x) multiplying the then current Purchase Price by the number of one
one-thousandths of a Preferred Share for which a Right was exercisable
immediately prior to the first occurrence of a Trigger Event (as subsequently
adjusted pursuant to Sections 11.1.1, 11.2, 11.3, 11.8, 11.9 and 11.12) and (y)
dividing that product by 50% of the then current per share market price of the
Common Shares of such Principal Party (determined pursuant to Section 11.4) on
the date of consummation of such consolidation, merger, sale or transfer;
PROVIDED, that the price per Right so payable and the number of Common Shares of
such Principal Party so receivable upon exercise of a Right shall thereafter be
subject to further adjustment as appropriate in accordance with Section 11.6 to
reflect any events covered thereby occurring in respect of the Common Shares of
such Principal Party after the occurrence 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; and (iv)
such Principal Party shall take such steps (including, but not limited to, the
reservation of a sufficient number of its Common Shares in accordance with
Section 9) 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 Common Shares thereafter deliverable upon
the exercise of the Rights; PROVIDED that, upon the subsequent occurrence of any
consolidation, merger, sale or transfer of assets or other extraordinary
transaction in respect of such Principal Party, each holder of a Right shall
thereupon be entitled to receive, upon exercise of a Right and payment of the
Purchase Price as provided in this Section 13.1, such cash, shares, rights,
warrants and other property which such holder would have been entitled to
receive had such holder, at the time of such transaction, owned the Common
Shares of the Principal Party receivable upon the exercise of a Right pursuant
to this Section 13.1, and such Principal Party shall take such steps (including,
but not limited to, reservation of shares of stock) as may be necessary to
permit the subsequent exercise of the Rights in accordance with the terms hereof
for such cash, shares, rights, warrants and other property. The Company shall
not consummate any such consolidation, merger, sale or transfer unless prior
thereto the Company and such Principal Party shall have executed and delivered
to the Rights Agent a supplemental agreement confirming that the requirements of
this Section 13.1 and Section 13.2 shall promptly be performed in accordance
with their terms and that such consolidation, merger, sale or transfer of assets
shall not result in a default by the Principal Party under this Agreement as the
same shall have been assumed by the Principal Party pursuant to this


                                       20
<PAGE>   22



Section 13.1 and Section 13.2 and providing that, as soon as practicable after
executing such agreement pursuant to this Section 13, the Principal Party, at
its own expense, shall

                      (1) prepare and file a registration statement under the
Securities Act, if necessary, with respect to the Rights and the securities
purchasable upon exercise of the Rights on an appropriate form, use its best
efforts to cause such registration statement to become effective as soon as
practicable after such filing and use its best efforts to cause such
registration statement to remain effective (with a prospectus at all times
meeting the requirements of the Securities Act) until the Expiration Date and
similarly comply with applicable state securities laws;

                      (2) use its best efforts, if the Common Shares of the
Principal Party shall be listed or admitted to trading on the New York Stock
Exchange or on another national securities exchange, to list or admit to trading
(or continue the listing of) the Rights and the securities purchasable upon
exercise of the Rights on the New York Stock Exchange or such securities
exchange, or, if the Common Shares of the Principal Party shall not be listed or
admitted to trading on the New York Stock Exchange or a national securities
exchange, to cause the Rights and the securities receivable upon exercise of the
Rights to be authorized for quotation on Nasdaq or on such other system then in
use;

                      (3) deliver to holders of the Rights historical financial
statements for the Principal Party which comply in all respects with the
requirements for registration on Form 10 (or any successor form) under the
Exchange Act; and

                      (4) obtain waivers of any rights of first refusal or
preemptive rights in respect of the Common Shares of the Principal Party subject
to purchase upon exercise of outstanding Rights.

               In case the Principal Party has provision in any of its
authorized securities or in its certificate of incorporation or by-laws or other
instrument governing its corporate affairs, which provision would have the
effect of (i) causing such Principal Party to issue (other than to holders of
Rights pursuant to this Section 13), in connection with, or as a consequence of,
the consummation of a transaction referred to in this Section 13, Common Shares
or common stock equivalents of such Principal Party at less than the then
current market price per share thereof (determined pursuant to Section 11.4) or
securities exercisable for, or convertible into, Common Shares or common stock
equivalents of such Principal Party at less than such then current market price
(other than to holders of Rights pursuant to this Section 13), or (ii) providing
for any special payment, taxes or similar provision in connection with the
issuance of the Common Shares of such Principal Party pursuant to the provision
of Section 13, then, in such event, the Company hereby agrees with each holder
of Rights that it shall not consummate any such transaction unless prior thereto
the Company and such Principal Party shall have executed and delivered to the
Rights Agent a supplemental agreement providing that the provision in question
of such Principal Party shall have been canceled, waived or amended, or that the
authorized securities shall be redeemed, so that the applicable provision will
have no effect in connection with, or as a consequence of, the consummation of
the proposed transaction.



                                       21
<PAGE>   23


               The Company covenants and agrees that it shall not, at any time
after the Trigger Event, enter into any transaction of the type described in
clauses (A) through (C) of this Section 13.1 if (i) at the time of or
immediately after such consolidation, merger, sale, transfer or other
transaction there are any rights, warrants or other instruments or securities
outstanding or agreements in effect which would substantially diminish or
otherwise eliminate the benefits intended to be afforded by the Rights, (ii)
prior to, simultaneously with or immediately after such consolidation, merger,
sale, transfer or other transaction, the stockholders of the Person who
constitutes, or would constitute, the Principal Party for purposes of Section
13.2 shall have received a distribution of Rights previously owned by such
Person or any of its Affiliates or Associates or (iii) the form or nature of
organization of the Principal Party would preclude or limit the exercisability
of the Rights. The provisions of this Section 13 shall similarly apply to
successive transactions of the type described in clauses (A) through (C) of this
Section 13.1.

               13.2. Principal Party. "Principal Party" shall mean:

                      (i)    in the case of any transaction described in (A) or
(B) of the first sentence of Section 13.1: (i) the Person that is the issuer of
the securities into which the Common Shares are converted in such merger or
consolidation, or, if there is more than one such issuer, the issuer the Common
Shares of which have the greatest aggregate market value of shares outstanding,
or (ii) if no securities are so issued, (x) the Person that is the other party
to the merger, if such Person survives said merger, or, if there is more than
one such Person, the Person the Common Shares of which have the greatest
aggregate market value of shares outstanding or (y) if the Person that is the
other party to the merger does not survive the merger, the Person that does
survive the merger (including the Company if it survives) or (z) the Person
resulting from the consolidation; and

                      (ii)   in the case of any transaction described in (C) of
the first sentence in Section 13.1, the Person that is the party receiving the
greatest portion of the assets or earning power transferred pursuant to such
transaction or transactions, or, if each Person that is a party to such
transaction or transactions receives the same portion of the assets or earning
power so transferred or if the Person receiving the greatest portion of the
assets or earning power cannot be determined, whichever of such Persons is the
issuer of Common Shares having the greatest aggregate market value of shares
outstanding; PROVIDED, HOWEVER, that in any such case described in the foregoing
clause (i) or (ii) of this Section 13.2, if the Common Shares of such Person are
not at such time or have not been continuously over the preceding 12-month
period registered under Section 12 of the Exchange Act, then (1) if such Person
is a direct or indirect Subsidiary of another Person the Common Shares of which
are and have been so registered, the term "Principal Party" shall refer to such
other Person, or (2) if such Person is a Subsidiary, directly or indirectly, of
more than one Person, the Common Shares of all of which are and have been so
registered, the term "Principal Party" shall refer to whichever of such Persons
is the issuer of Common Shares having the greatest aggregate market value of
shares outstanding, or (3) if 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 clauses (1) and (2) above
shall apply to each of the owners having an interest in the venture as if the
Person owned by the joint venture was a Subsidiary of both or all of such joint
venturers, and the Principal Party in each such case shall bear the obligations
set forth in this Section 13 in the same ratio as its interest in such Person
bears to the total of such interests.



                                       22
<PAGE>   24


               13.3. Approved Acquisitions. Notwithstanding anything contained
herein to the contrary, upon the consummation of any merger or other acquisition
transaction of the type described in clause (A), (B) or (C) of Section 13.1
involving the Company pursuant to a merger or other acquisition agreement
between the Company and any Person (or one or more of such Person's Affiliates
or Associates) which agreement has been approved by the Board of Directors of
the Company prior to any Person becoming an Acquiring Person, this Agreement and
the rights of holders of Rights hereunder shall be terminated in accordance with
Section 7.1.

        Section 14. Fractional Rights and Fractional Shares.

               14.1. Cash in Lieu of Fractional Rights. The Company shall not be
required to issue fractions of Rights or to distribute Right Certificates which
evidence fractional Rights (except prior to the Distribution Date in accordance
with Section 11.15). In lieu of such fractional Rights, there shall be paid to
the registered holders of the Right 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 14.1, 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 for any day shall be the last sale price, regular way, or, in case no such
sale takes place on such day, the average of the closing bid and asked prices,
regular way, in either case as reported in the principal consolidated
transaction reporting system with respect to securities listed or admitted to
trading on the New York Stock Exchange or, if the Rights are not listed or
admitted to trading on the New York Stock Exchange, as reported in the principal
consolidated transaction reporting system with respect to securities listed on
the principal national securities exchange on which the Rights are listed or
admitted to trading or, if the Rights are not listed or admitted to trading on
any national securities exchange, the last quoted price or, if not so quoted,
the average of the high bid and low asked prices in the over-the-counter market,
as reported by Nasdaq or such other system then in use or, if on any such date
the Rights are not quoted by any such organization, the average of the closing
bid and asked prices as furnished by a professional market maker making a market
in the Rights selected by the Board of Directors of the Company. If on any such
date no such market maker is making a market in the Rights, the current market
value of the Rights on such date shall be the fair value of the Rights as
determined in good faith by the Board of Directors of the Company, or, if at the
time of such determination there is an Acquiring Person, by a nationally
recognized investment banking firm selected by the Board of Directors of the
Company, which shall have the duty to make such determination in a reasonable
and objective manner, which determination shall be described in a statement
filed with the Rights Agent and shall be conclusive for all purposes.

               14.2. Cash in Lieu of Fractional Preferred Shares. The Company
shall not be required to issue fractions of Preferred Shares (other than
fractions which are integral multiples of one one-thousandth of a Preferred
Share) upon exercise or exchange of the Rights or to distribute certificates
which evidence fractional Preferred Shares (other than fractions which are
integral multiples of one one-thousandth of a Preferred Share). Interests in
fractions of Preferred Shares in integral multiples of one one-thousandth of a
Preferred Share 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


                                       23
<PAGE>   25


               preferences to which they are entitled as beneficial owners of
the Preferred Shares represented by such depositary receipts. In lieu of
fractional Preferred Shares that are not integral multiples of one
one-thousandth of a Preferred Share, the Company shall pay to the registered
holders of Right Certificates at the time such Rights are exercised or exchanged
as herein provided an amount in cash equal to the same fraction of the current
per share market price of one Preferred Share (as determined in accordance with
Section 14.1) for the Trading Day immediately prior to the date of such exercise
or exchange.

               14.3. Cash in Lieu of Fractional Common Shares. The Company shall
not be required to issue fractions of Common Shares or to distribute
certificates which evidence fractional Common Shares upon the exercise or
exchange of Rights. In lieu of such fractional Common Shares, the Company shall
pay to the registered holders of the Right Certificates with regard to which
such fractional Common Shares would otherwise be issuable an amount in cash
equal to the same fraction of the current market value of a whole Common Share
(as determined in accordance with Section 14.1) for the Trading Day immediately
prior to the date of such exercise or exchange.

               14.4. Waiver of Right to Receive Fractional Rights or Shares. The
holder of a Right by the acceptance of the Rights expressly waives his right to
receive any fractional Rights or any fractional shares upon exercise or exchange
of a Right, except as permitted by this Section 14.

        Section 15. Rights of Action. All rights of action in respect of this
Agreement, except the rights of action given to the Rights Agent under Section
18, are vested in the respective registered holders of the Right Certificates
(and, prior to the Distribution Date, the registered holders of the Common
Shares); and any registered holder of any Right Certificate (or, prior to the
Distribution Date, of the Common Shares), without the consent of the Rights
Agent or of the holder of any other Right Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his own behalf and for his own
benefit, enforce this Agreement, and may institute and maintain any suit, action
or proceeding against the Company to enforce this Agreement, or otherwise
enforce or act in respect of his right to exercise the Rights evidenced by such
Right Certificate in the manner provided in such Right 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 under, and
injunctive relief against actual or threatened violations of, the obligations of
any Person (including, without limitation, the Company) subject to this
Agreement.

        Section 16. Agreement of Right 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 the Common Shares;

               (b)    as of and after the Distribution Date, the Right
        Certificates are transferable only on the registry books of the Rights
        Agent if surrendered at the office of the Rights



                                       24
<PAGE>   26

        Agent designated for such purpose, duly endorsed or accompanied by a
        proper instrument of transfer with all required certifications
        completed; and

               (c)    the Company and the Rights Agent may deem and treat the
        Person in whose name the Right Certificate (or, prior to the
        Distribution Date, the associated Common Shares certificate) is
        registered as the absolute owner thereof and of the Rights evidenced
        thereby (notwithstanding any notations of ownership or writing on the
        Right Certificates or the associated Common Shares certificate made by
        anyone other than the Company or the Rights Agent) for all purposes
        whatsoever, and neither the Company nor the Rights Agent shall be
        affected by any notice to the contrary.

        Section 17. Right Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Shares or any
other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Right Certificate be construed to confer upon the holder of any Right
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 24), or to receive dividends or
subscription rights, or otherwise, until the Right or Rights evidenced by such
Right Certificate shall have been exercised in accordance with the provisions
hereof.

        Section 18. Concerning the Rights Agent. The Company agrees to pay to
the Rights Agent reasonable compensation for all services rendered by it
hereunder in accordance with a fee schedule to be mutually agreed upon and, from
time to time, on demand of the Rights Agent, its reasonable expenses and counsel
fees and other disbursements incurred in the administration and execution of
this Agreement and the exercise and performance of its duties hereunder. The
Company also agrees to indemnify the Rights Agent for, and to hold it harmless
against, any loss, liability, or expense, incurred without negligence, bad faith
or willful misconduct on the part of the Rights Agent, for anything done or
omitted by the Rights Agent in connection with the acceptance and administration
of this Agreement, including 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 Right Certificate or
certificate for the Preferred Shares or the Common Shares or for other
securities of the Company, instrument of assignment or transfer, power of
attorney, endorsement, affidavit, letter, notice, instruction, direction,
consent, certificate, statement, or other paper or document believed by it to be
genuine and to be signed, executed and, where necessary, verified or
acknowledged, by the proper Person or Persons.

Section 19. Merger or Consolidation or Change of Name of Rights Agent. Any
corporation or limited liability company into which the Rights Agent or any
successor Rights Agent may be merged or with which it may be consolidated, or
any corporation or limited liability company resulting from any merger or
consolidation to which the Rights Agent or any successor Rights Agent shall be a
party, or any corporation or limited liability company


                                       25
<PAGE>   27


succeeding to the corporate trust or stock transfer 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 or
limited liability company would be eligible for appointment as a successor
Rights Agent under the provisions of Section 21. In case at the time such
successor Rights Agent shall succeed to the agency created by this Agreement,
any of the Right 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 Right Certificates so countersigned;
and in case at that time any of the Right Certificates shall not have been
countersigned, any successor Rights Agent may countersign such Right
Certificates either in the name of the predecessor Rights Agent or in the name
of the successor Rights Agent; and in all such cases such Right Certificates
shall have the full force provided in the Right Certificates and in this
Agreement.

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

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

               20.1. Legal Counsel. 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.

               20.2. Certificates as to Facts or Matters. Whenever in the
performance of its duties under this Agreement the Rights Agent shall deem it
necessary or desirable that any fact or matter 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
any one of the Chairman of the Board of Directors, the Chief Executive Officer,
the President, the Chief Financial Officer, any Vice President, the Treasurer,
the Secretary or any Assistant Treasurer or Assistant Secretary of the Company
and delivered to the Rights Agent; and such certificate shall be full
authorization to the Rights Agent for any action taken or suffered in good faith
by it under the provisions of this Agreement in reliance upon such certificate.

               20.3. Standard of Care.  The Rights Agent shall be liable
hereunder only for its own negligence, bad faith or willful misconduct.

               20.4. Reliance on Agreement and Right Certificates.  The Rights
Agent shall not be liable for or by reason of any of the statements of fact or
recitals contained in this Agreement


                                       26
<PAGE>   28

or in the Right Certificates (except as to its countersignature thereof) or be
required to verify the same, but all such statements and recitals are and shall
be deemed to have been made by the Company only.

               20.5. No Responsibility as to Certain Matters. 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 Right
Certificate (except its countersignature thereof); nor shall it be responsible
for any breach by the Company of any covenant or condition contained in this
Agreement or in any Right Certificate; nor shall it be responsible for any
change in the exercisability of the Rights (including the Rights becoming void
pursuant to Section 11.1.2) or any adjustment required under the provisions of
Sections 3, 11, 13, 23 or 27 or responsible for the manner, method or amount of
any such adjustment or the ascertaining of the existence of facts that would
require any such adjustment (except with respect to the exercise of Rights
evidenced by Right Certificates after actual notice of any such change or
adjustment); nor shall it by any act hereunder be deemed to make any
representation or warranty as to the authorization or reservation of any
Preferred Shares or other securities to be issued pursuant to this Agreement or
any Right Certificate or as to whether any Preferred Shares will, when so
issued, be validly authorized and issued, fully paid and nonassessable.

               20.6. Further Assurance by Company. 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.

               20.7. Authorized Company Officers. The Rights Agent is hereby
authorized and directed to accept instructions with respect to the performance
of its duties hereunder from any one of the Chairman of the Board of Directors,
the Chief Executive Officer, the President, the Chief Financial Officer, any
Vice President, the Treasurer, the Secretary or any Assistant Treasurer or
Assistant Secretary of the Company, and to apply to such officers for advice or
instructions in connection with its duties under this Agreement, 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 or for any delay in acting
while waiting for these instructions. Any application by the Rights Agent for
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 Agreement and the
date on and/or after which such action shall be taken or such omission shall be
effective. The Rights Agent shall not be liable to the Company for any action
taken by, or omission of, the Rights Agent 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 of any such action (or
the effective date in the case of omission), the Rights Agent shall have
received written instructions in response to such application specifying the
action to be taken or omitted.


                                       27
<PAGE>   29


               20.8. Freedom to Trade in Company Securities. 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 otherwise act as
fully and freely as though it were not Rights Agent under this Agreement.
Nothing herein shall preclude the Rights Agent from acting in any other capacity
for the Company or for any other legal entity.

               20.9. Reliance on Attorneys and Agents. 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 resulting from any such act, omission, default, neglect or
misconduct, PROVIDED that reasonable care was exercised in the selection and
continued employment thereof.

               20.10. Incomplete Certificate. If, with respect to any Rights
Certificate surrendered to the Rights Agent for exercise or transfer, the
certificate contained in the form of assignment or the form of election to
purchase set forth on the reverse thereof, as the case may be, has not been
completed to certify the holder is not an Acquiring Person (or an Affiliate or
Associate thereof), the Rights Agent shall not take any further action with
respect to such requested exercise or transfer without first consulting with the
Company.

               20.11. Rights Holders List. At any time and from time to time
after the Distribution Date, upon the request of the Company, the Rights Agent
shall promptly deliver to the Company a list, as of the most recent practicable
date (or as of such earlier date as may be specified by the Company), of the
holders of record of Rights.

        Section 21. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon thirty (30) days' notice in writing mailed to the Company and to each
transfer agent of the Common Shares and/or Preferred Shares, as applicable, by
registered or certified mail. Following the Distribution Date, the Company shall
promptly notify the holders of the Right Certificates by first-class mail of any
such resignation. The Company may remove the Rights Agent or any successor
Rights Agent upon thirty (30) days' notice in writing, mailed to the Rights
Agent or successor Rights Agent, as the case may be, and to each transfer agent
of the Common Shares and/or Preferred Shares, as applicable, by registered or
certified mail, and to the holders of the Right Certificates by first-class
mail. If the Rights Agent shall resign or be removed or shall otherwise become
incapable of acting, the resigning, removed, or incapacitated Rights Agent shall
remit to the Company, or to any successor Rights Agent designated by the
Company, all books, records, funds, certificates or other documents or
instruments of any kind then in its possession which were acquired by such
resigning, removed or incapacitated Rights Agent in connection with its services
as Rights Agent hereunder, and shall thereafter be discharged from all duties
and obligations hereunder. Following notice of such removal, resignation or
incapacity, the Company shall appoint a successor to such Rights Agent. If the
Company shall fail to make such appointment within a period of thirty (30) days
after giving notice of such removal or after it has been notified in writing of
such resignation or incapacity by the resigning or incapacitated Rights Agent or
by the


                                       28
<PAGE>   30


holder of a Right Certificate (who shall, with such notice, submit his Right
Certificate for inspection by the Company), then the registered holder of any
Right Certificate may apply to any court of competent jurisdiction for the
appointment of a new Rights Agent. Any successor Rights Agent, whether appointed
by the Company or by such a court, shall be a corporation organized and doing
business under the laws of the United States or of the State of New York or the
State of California (or 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 California) in good standing, having an office in the State of
New York or the State of California, which is authorized under such laws to
exercise stock transfer or corporate trust powers and is subject to supervision
or examination by Federal or state authority and which has at the time of its
appointment as Rights Agent a combined capital and surplus of at least $10
million. 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 Shares
and/or Preferred Shares, as applicable, and, following the Distribution Date,
mail a notice thereof in writing to the registered holders of the Right
Certificates. Failure to give any notice provided for in this Section 21,
however, or any defect therein, shall not affect the legality or validity of the
resignation or removal of the Rights Agent or the appointment of the successor
Rights Agent, as the case may be.

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

        Section 23. Redemption.

                23.1. Right to Redeem. The Board of Directors of the Company
may, at its option, at any time prior to a Trigger Event, 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,
recapitalization or similar transaction occurring after the date hereof


                                       29
<PAGE>   31


(such redemption price being hereinafter referred to as the "Redemption Price"),
and the Company may, at its option, pay the Redemption Price in Common Shares
(based on the "current per share market price," determined pursuant to Section
11.4, of the Common Shares at the time of redemption), cash or any other form of
consideration deemed appropriate by the Board of Directors. The redemption of
the Rights by the Board of Directors may be made effective at such time, on such
basis and subject to such conditions as the Board of Directors in its sole
discretion may establish.

               23.2. Redemption Procedures. Immediately upon the action of the
Board of Directors of the Company ordering the redemption of the Rights (or at
such later time as the Board of Directors may establish for the effectiveness of
such redemption), and without any further action and without any notice, the
right to exercise the Rights will terminate and the only right thereafter of the
holders of Rights shall be to receive the Redemption Price for each Right so
held. The Company shall promptly give public notice of such redemption;
PROVIDED, HOWEVER, that the failure to give, or any defect in, any such notice
shall not affect the validity of such redemption. The Company shall promptly
give, or cause the Rights Agent to give, notice of such redemption to the
holders of the then outstanding Rights by mailing such notice 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 Shares. 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 shall state the method by which the
payment of the Redemption Price will be made. Neither the Company nor any of its
Affiliates or Associates may redeem, acquire or purchase for value any Rights at
any time in any manner other than that specifically set forth in this Section 23
or in Section 27, and other than in connection with the purchase, acquisition or
redemption of Common Shares prior to the Distribution Date.

        Section 24. Notice of Certain Events. In case the Company shall propose
at any time after the earlier of the Shares Acquisition Date and the
Distribution Date (a) to pay any dividend payable in stock of any class to the
holders of Preferred Shares or to make any other distribution to the holders of
Preferred Shares (other than a regular periodic cash dividend at a rate not in
excess of 125% of the rate of the last regular periodic cash dividend
theretofore paid or, in case regular periodic cash dividends have not
theretofore been paid, at a rate not in excess of 50% of the average net income
per share of the Company for the four quarters ended immediately prior to the
payment of such dividends, or a stock dividend on, or a subdivision, combination
or reclassification of the Common Shares), or (b) to offer to the holders of
Preferred Shares rights or warrants to subscribe for or to purchase any
additional Preferred Shares or shares of stock of any class or any other
securities, rights or options, or (c) to effect any reclassification of its
Preferred Shares (other than a reclassification involving only the subdivision
of outstanding Preferred Shares), 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 50% or more of the assets or earning power of the Company and
its Subsidiaries (taken as a whole) to, any other Person (other than pursuant to
a merger or other acquisition agreement of the type described in Section
1.3(ii)(A)(z)), or (e) to effect the liquidation, dissolution or winding up of
the Company, or (f) to declare or pay any dividend on the Common Shares payable
in Common Shares or to effect a subdivision, combination or consolidation of the
Common Shares (by reclassification or otherwise than by payment of


                                       30
<PAGE>   32

dividends in Common Shares), then, in each such case, the Company shall give to
the Rights Agent and to each holder of a Right Certificate, in accordance with
Section 25, 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 Preferred Shares and/or
Common Shares, 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 ten
(10) days prior to the record date for determining holders of the Preferred
Shares for purposes of such action, and in the case of any such other action, at
least ten (10) days prior to the date of the taking of such proposed action or
the date of participation therein by the holders of the Preferred Shares and/or
Common Shares, whichever shall be the earlier.

        In case any event set forth in Section 11.1.2 or Section 13 shall occur,
then, in any such case, (i) the Company shall as soon as practicable thereafter
give to the Rights Agent and to each holder of a Right Certificate, in
accordance with Section 25, a notice of the occurrence of such event, which
notice shall describe the event and the consequences of the event to holders of
Rights under Section 11.1.2 and Section 13, and (ii) all references in this
Section 24 to Preferred Shares shall be deemed thereafter to refer to Common
Shares and/or, if appropriate, other securities.

        Notwithstanding anything in this Agreement to the contrary, prior to the
Distribution Date a filing by the Company with the Securities and Exchange
Commission shall constitute sufficient notice to the holders of securities of
the Company, including the Rights, for purposes of this Agreement and no other
notice need be given.

        Section 25. Notices. Notices or demands authorized by this Agreement to
be given or made by the Rights Agent or by the holder of any Right 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:

                      Geron Corporation
                      230 Constitution Drive
                      Menlo Park, CA  94025
                      Attention:  Secretary

Subject to the provisions of Section 21 and Section 24, any notice or demand
authorized by this Agreement to be given or made by the Company or by the holder
of any Right 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:

                      U.S. Stock Transfer Corporation
                      1745 Gardena Avenue, 2nd Floor
                      Glendale, CA 91204
                      Attention:  William Garza



                                       31
<PAGE>   33


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

        Section 26. Supplements and Amendments. For so long as the Rights are
then redeemable, the Company may in its sole and absolute discretion, and the
Rights Agent shall, if the Company so directs, supplement or amend any provision
of this Agreement in any respect without the approval of any holders of Rights
or Common Shares. From and after the time that the Rights are no longer
redeemable, the Company may, and the Rights Agent shall, if the Company so
directs, from time to time supplement or amend this Agreement without the
approval of any holders of Rights (i) to cure any ambiguity or to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provisions herein or (ii) to make any other changes or provisions
in regard to matters or questions arising hereunder which the Company may deem
necessary or desirable, including but not limited to extending the Final
Expiration Date; PROVIDED, HOWEVER, that no such supplement or amendment shall
adversely affect the interests of the holders of Rights as such (other than an
Acquiring Person or an Affiliate or Associate of an Acquiring Person), and no
such supplement or amendment may cause the Rights again to become redeemable or
cause this Agreement again to become amendable other than in accordance with
this sentence; PROVIDED FURTHER, that the right of the Board of Directors to
extend the Distribution Date shall not require any amendment or supplement
hereunder. Upon the delivery of a certificate from an appropriate officer of the
Company which states that the proposed supplement or amendment is in compliance
with the terms of this Section 26, the Rights Agent shall execute such
supplement or amendment. Without limiting the foregoing, at any time prior to
such time as any Person becomes an Acquiring Person, the Company and the Rights
Agent may amend this Agreement to lower the thresholds set forth in Sections 1.1
and 3.1 to not less than the greater of (i) any percentage greater than the
largest percentage of the outstanding Common Shares then known by the Company to
be beneficially owned by any Person (other than an Exempt Person) and (ii) 10%.

        Section 27. Exchange.

                27.1. Exchange of Common Shares for Rights. The Board of
Directors of the Company may, at its option, at any time after the occurrence of
a Trigger Event, exchange Common Shares for 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 11.1.2) by exchanging at an exchange ratio
of one Common Share per Right, appropriately adjusted to reflect any stock
split, stock dividend or similar transaction occurring after the date hereof
(such amount per Right being hereinafter referred to as the "Exchange
Consideration"). Notwithstanding the foregoing, the Board of Directors shall not
be empowered to effect such exchange at any time after any Acquiring Person
shall have become the Beneficial Owner of 50% or more of the Common Shares then
outstanding. From and after the occurrence of an event specified in Section
13.1, any Rights that theretofore have not been exchanged pursuant to this
Section 27.1 shall thereafter be exercisable only in accordance with Section 13
and may not be exchanged pursuant to this Section 27.1. The exchange of the
Rights by the Board of


                                       32
<PAGE>   34


Directors may be made effective at such time, on such basis and with such
conditions as the Board of Directors in its sole discretion may establish.

               27.2. Exchange Procedures. Immediately upon the action of the
Board of Directors of the Company ordering the exchange for any Rights pursuant
to Section 27.1 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 the Exchange Consideration. 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
addresses 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 shall state the
method by which the exchange of the Common Shares 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 the Rights that have become void pursuant to the
provisions of Section 11.1.2) held by each holder of Rights.

               27.3. Insufficient Shares. The Company may at its option
substitute, and, in the event that there shall not be sufficient Common Shares
issued but not outstanding or authorized but unissued to permit an exchange of
Rights for Common Shares as contemplated in accordance with this Section 27, the
Company shall substitute to the extent of such insufficiency, for each Common
Share that would otherwise be issuable upon exchange of a Right, a number of
Preferred Shares or fraction thereof (or equivalent preferred stock, as such
term is defined in Section 11.2) such that the current per share market price
(determined pursuant to Section 11.4) of one Preferred Share (or equivalent
preferred share) multiplied by such number or fraction is equal to the current
per share market price of one Common Share (determined pursuant to Section 11.4)
as of the date of such exchange.

        Section 28. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

        Section 29. 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 Right Certificates (and, prior to
the Distribution Date, the Common Shares) 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 Right Certificates (and, prior to the Distribution Date, the Common Shares).

        Section 30. Determination and Actions by the Board of Directors. The
Board of Directors of the Company shall have the exclusive power and authority
to administer this Agreement and to exercise the rights and powers specifically
granted to the Board of Directors of the Company or to the Company, or as may be
necessary or advisable in the administration of this Agreement, including,
without limitation, the right and power to (i) interpret the provisions of this
Agreement and (ii) make all determinations deemed necessary or advisable for the
administration of this Agreement (including, without limitation, a determination
to redeem or not

                                       33
<PAGE>   35


redeem the Rights or amend this Agreement). All such actions, calculations,
interpretations and determinations (including, for purposes of clause (y) below,
all omissions with respect to the foregoing) that are done or made by the Board
of Directors of the Company in good faith shall (x) be final, conclusive and
binding on the Company, the Rights Agent, the holders of the Rights, as such,
and all other parties, and (y) not subject the Board of Directors to any
liability to the holders of the Rights.

        Section 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.

        Section 32. Governing Law. This Agreement and each Right Certificate
issued hereunder shall be deemed to be a contract made under the laws of the
State of California 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
performed entirely within such State.

        Section 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.

        Section 34. Descriptive Heading. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.



                            [Signature Page Follows]







                                       34
<PAGE>   36

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly
executed, as of the day and year first above written.

                                            GERON CORPORATION


                                            By   /s/  David L. Greenwood
                                               --------------------------------
                                               Name:  David L. Greenwood
                                               Title: Chief Financial Officer




                                            U.S. STOCK TRANSFER CORPORATION


                                            By   /s/  William Garza
                                               --------------------------------
                                               Name:  William Garza
                                               Title: Vice President



                                       35
<PAGE>   37
                                                                       EXHIBIT A



                                     FORM OF

                           CERTIFICATE OF DESIGNATIONS

                                       of

                  SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       of

                                GERON CORPORATION

                         (Pursuant to Section 151 of the
                        Delaware General Corporation Law)

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

        Geron Corporation, a corporation organized and existing under the
General Corporation Law of the State of Delaware (hereinafter called the
"Corporation"), hereby certifies that the following resolution was adopted by
the Board of Directors of the Corporation as required by Section 151 of the
General Corporation Law at a meeting duly called and held on July 20, 2001.

        RESOLVED, that pursuant to the authority granted to and vested in the
Board of Directors of this Corporation (hereinafter called the "Board of
Directors" or the "Board") in accordance with the provisions of the Certificate
of Incorporation of this Corporation, the Board of Directors hereby creates a
series of Preferred Stock, par value $.001 per share (the "Preferred Stock"), of
the Corporation and hereby states the designation and number of shares, and
fixes the relative rights, powers and preferences, and qualifications,
limitations and restrictions thereof as follows:

        Section 1. Designation and Amount. The shares of such series shall be
designated as "Series A Junior Participating Preferred Stock" (the "Series A
Preferred Stock") and the number of shares constituting the Series A Preferred
Stock shall be Fifty Thousand (50,000). 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 Preferred Stock to a number less
than the number of shares then outstanding plus the number of shares reserved
for issuance upon the exercise of outstanding options, rights or warrants or
upon the conversion of any outstanding securities issued by the Corporation
convertible into Series A Preferred Stock.

         Section 2. Dividends and Distributions.

                  (A) Subject to the prior and superior rights of the holders of
         any shares of any class or series of stock of this Corporation ranking
         prior and superior to the Series A Preferred Stock with respect to
         dividends, the holders of shares of Series A Preferred Stock, in
         preference to the holders of Common Stock, par value $.001 per share
         (the "Common Stock"), of the Corporation, and of any other stock
         ranking junior to the Series



                                      A-1
<PAGE>   38
         A Preferred Stock, shall be entitled to receive, when, as and if
         declared by the Board of Directors out of funds legally available for
         the purpose, quarterly dividends payable in cash on the 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 Preferred Stock, in an
         amount per share (rounded to the nearest cent) equal to the greater of
         (a) $1.00 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 subdivision 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 Preferred Stock. In the event the Corporation shall
         at any time declare or pay any dividend on the Common Stock payable in
         shares of Common Stock, or effect a subdivision, combination or
         consolidation of the outstanding shares of Common Stock (by
         reclassification or otherwise than by payment of a dividend in shares
         of Common Stock) into a greater or lesser number of shares of Common
         Stock, then in each such case the amount to which holders of shares of
         Series A 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 Preferred Stock as provided in paragraph (A) of this
         Section 2 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 $1.00 per share on the Series A
         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 Preferred Stock from the Quarterly
         Dividend Payment Date next preceding the date of issue of such shares,
         unless the date of issue of such shares is prior to the record date for
         the first Quarterly Dividend Payment Date, in which case dividends on
         such shares shall begin to accrue from the date of issue of such
         shares, or unless the date of issue is a Quarterly Dividend Payment
         Date or is a date after the record date for the determination of
         holders of shares of Series A 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 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.



                                      A-2
<PAGE>   39
         The Board of Directors may fix a record date for the determination of
         holders of shares of Series A Preferred Stock entitled to receive
         payment of a dividend or distribution declared thereon, which record
         date shall be not more than 60 days prior to the date fixed for the
         payment thereof.

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

                      (A) Subject to the provision for adjustment hereinafter
        set forth, each share of Series A 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 declare or pay any dividend on the Common Stock payable in
        shares of Common Stock, or effect a subdivision, combination or
        consolidation of the outstanding shares of Common Stock (by
        reclassification or otherwise than by payment of a dividend in shares of
        Common Stock) into a greater or lesser number of shares of Common Stock,
        then in each such case the number of votes per share to which holders of
        shares of Series A 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 that were outstanding immediately
        prior to such event.

                      (B) Except as otherwise provided herein, in any other
        Certificate of Designations creating a series of Preferred Stock or any
        similar stock, or by law, the holders of shares of Series A Preferred
        Stock and the holders of shares of Common Stock and any other capital
        stock of the Corporation having general voting rights shall vote
        together as one class on all matters submitted to a vote of stockholders
        of the Corporation.

                      (C) Except as set forth herein, or as otherwise provided
        by law, holders of Series A 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.

         Section 4. Certain Restrictions.

                      (A) Whenever quarterly dividends or other dividends or
        distributions payable on the Series A 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 Preferred Stock outstanding shall have been paid in full, the
        Corporation shall not:

                             (i) declare or pay dividends, or make any other
               distributions, on any shares of stock ranking junior (either as
               to dividends or upon liquidation, dissolution or winding up) to
               the Series A Preferred Stock;

                             (ii) declare or pay dividends, or make any other
               distributions, on any shares of stock ranking on a parity (either
               as to dividends or upon



                                      A-3
<PAGE>   40
               liquidation, dissolution or winding up) with the Series A
               Preferred Stock, except dividends paid ratably on the Series A
               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 junior (either as to
               dividends or upon liquidation, dissolution or winding up) to the
               Series A Preferred Stock, provided that the Corporation may at
               any time redeem, purchase or otherwise acquire shares of any such
               junior stock in exchange for shares of any stock of the
               Corporation ranking junior (both as to dividends and upon
               dissolution, liquidation or winding up) to the Series A Preferred
               Stock; or

                             (iv) redeem or purchase or otherwise acquire for
               consideration any shares of Series A Preferred Stock, or any
               shares of stock ranking on a parity with the Series A Preferred
               Stock, except in accordance with a purchase offer made in writing
               or by publication (as determined by the Board of Directors) to
               all holders of such shares upon such terms as the Board of
               Directors, after consideration of the respective annual dividend
               rates and other relative rights and preferences of the respective
               series and classes, shall determine in good faith will result in
               fair and equitable treatment among the respective series or
               classes.

                      (B) The Corporation shall not permit any subsidiary of the
        Corporation to purchase or otherwise acquire for consideration any
        shares of stock of the Corporation unless the Corporation could, under
        paragraph (A) of this Section 4, purchase or otherwise acquire such
        shares at such time and in such manner.

        Section 5. Reacquired Shares. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and canceled 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
subject to the conditions and restrictions on issuance set forth herein, in the
Certificate of Incorporation, or in any other Certificate of Designations
creating a series of Preferred Stock or any similar stock or as otherwise
required by law.

         Section 6. Liquidation, Dissolution or Winding Up. (A) Upon any
liquidation, dissolution or winding up of the Corporation, voluntary or
otherwise no distribution shall be made (1) to the holders of shares of stock
ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series A Preferred Stock unless, prior thereto, the holders
of shares of Series A Preferred Stock shall have received an amount per share
(the "Series A Liquidation Preference") equal to $1,000 per share, plus an
amount equal to accrued and unpaid dividends and distributions thereon, whether
or not declared, to the date of such payment, provided that the holders of
shares of Series A Preferred Stock shall be entitled to receive an aggregate
amount per share, subject to the provision for adjustment hereinafter set forth,
equal to 1,000 times the aggregate amount to be distributed per share to holders
of shares of Common Stock, or (2) to the holders of shares of stock ranking on a
parity (either as to dividends or upon liquidation, dissolution or winding up)
with the Series A Preferred Stock,



                                      A-4
<PAGE>   41
except distributions made ratably on the Series A Preferred Stock and all such
parity stock in proportion to the total amounts to which the holders of all such
shares are entitled upon such liquidation, dissolution or winding up. In the
event the Corporation shall at any time declare or pay any dividend on the
Common Stock payable in shares of Common Stock, or effect a subdivision,
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the aggregate amount to which holders of shares of Series A Preferred
Stock were entitled immediately prior to such event under the proviso in clause
(1) 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 are outstanding immediately prior to such
event.

                      (B) In the event, however, that there are not sufficient
        assets available to permit payment in full of the Series A Liquidation
        Preference and the liquidation preferences of all other classes and
        series of stock of the Corporation, if any, that rank on a parity with
        the Series A Preferred Stock in respect thereof, then the assets
        available for such distribution shall be distributed ratably to the
        holders of the Series A Preferred Stock and the holders of such parity
        shares in proportion to their respective liquidation preferences.

                      (C) Neither the merger or consolidation of the Corporation
        into or with another corporation nor the merger or consolidation of any
        other corporation into or with the Corporation shall be deemed to be a
        liquidation, dissolution or winding up of the Corporation within the
        meaning of this Section 6.

        Section 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 each share of
Series A Preferred Stock shall at the same time be similarly exchanged or
changed into an amount per share, subject to the provision for adjustment
hereinafter set forth, equal to 1,000 times the aggregate amount of stock,
securities, cash and/or any other property (payable in kind), as the case may
be, into which or for which each share of Common Stock is changed or exchanged.
In the event the Corporation shall at any time declare or pay any dividend on
the Common Stock payable in shares of Common Stock, or effect a subdivision,
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, 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 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 were
outstanding immediately prior to such event.

         Section 8. No Redemption. The shares of Series A Preferred Stock shall
not be redeemable by the Company.



                                      A-5
<PAGE>   42
        Section 9. Rank. The Series A Preferred Stock shall rank, with respect
to the payment of dividends and the distribution of assets upon liquidation,
dissolution or winding up, junior to all series of any other class of the
Corporation's Preferred Stock, except to the extent that any such other series
specifically provides that it shall rank on a parity with or junior to the
Series A Preferred Stock.

        Section 10. Amendment. At any time any shares of Series A Preferred
Stock are outstanding, the Certificate of Incorporation of the Corporation shall
not be amended in any manner which would materially alter or change the powers,
preferences or special rights of the Series A Preferred Stock so as to affect
them adversely without the affirmative vote of the holders of at least
two-thirds of the outstanding shares of Series A Preferred Stock, voting
separately as a single class.

        Section 11. Fractional Shares. Series A Preferred Stock may be issued in
fractions of a share that 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 Preferred Stock.

        IN WITNESS WHEREOF, this Certificate of Designations is executed on
behalf of the Corporation by its Secretary this 20th day of July 2001.


                                                 /s/ William D. Stempel
                                                 -------------------------------



                                      A-6
<PAGE>   43
                                                                       EXHIBIT B

                           [Form of Right Certificate]

Certificate No. R-                                                _______ Rights

        NOT EXERCISABLE AFTER JULY 31, 2011 OR EARLIER IF NOTICE OF REDEMPTION
        OR EXCHANGE IS GIVEN OR IF THE COMPANY IS MERGED OR ACQUIRED PURSUANT TO
        AN AGREEMENT OF THE TYPE DESCRIBED IN SECTION 1.3(ii)(A)(z) OF THE
        AGREEMENT. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.01 PER RIGHT, AND
        TO EXCHANGE ON THE TERMS SET FORTH IN THE AGREEMENT. UNDER CERTAIN
        CIRCUMSTANCES (SPECIFIED IN SECTION 11.1.2 OF THE AGREEMENT), RIGHTS
        BENEFICIALLY OWNED BY OR TRANSFERRED TO AN ACQUIRING PERSON (AS DEFINED
        IN THE AGREEMENT), OR ANY SUBSEQUENT HOLDER OF SUCH RIGHTS WILL BECOME
        NULL AND VOID AND WILL NO LONGER BE TRANSFERABLE.

                                Right Certificate

                                GERON CORPORATION

        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 July 20, 2001, as the same may be amended from time to
time (the "Agreement"), between Geron Corporation, a Delaware corporation (the
"Company"), and U.S. Stock Transfer Corporation, a California corporation, as
Rights Agent (the "Rights Agent"), to purchase from the Company at any time
after the Distribution Date and prior to 5:00 P.M. (New York City time) on July
31, 2011, at the offices of the Rights Agent, or its successors as Rights Agent,
designated for such purpose, one one-thousandth of a fully paid, nonassessable
share of Series A Junior Participating Preferred Stock, par value $.001 per
share (the "Preferred Shares") of the Company, at a purchase price of $100.00
per one one-thousandth of a Preferred Share, subject to adjustment (the
"Purchase Price"), upon presentation and surrender of this Right Certificate
with the Form of Election to Purchase and certification duly executed. The
number of Rights evidenced by this Right Certificate (and the number of one
one-thousandths of a Preferred Share 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 July 20, 2001 based on the Preferred Shares as
constituted at such date. Capitalized terms used in this Right Certificate
without definition shall have the meanings ascribed to them in the Agreement. As
provided in the Agreement, the Purchase Price and the number of Preferred Shares
which may be purchased upon the exercise of the Rights evidenced by this Right
Certificate are subject to modification and adjustment upon the happening of
certain events.

        This Right Certificate is subject to all of the terms, provisions and
conditions of the Agreement, which terms, provisions and conditions are hereby
incorporated herein by reference and made a part hereof and to which Agreement
reference is hereby made for a full description



                                      B-1
<PAGE>   44
of the rights, limitations of rights, obligations, duties and immunities
hereunder of the Rights Agent, the Company and the holders of the Right
Certificates. Copies of the Agreement are on file at the principal offices of
the Company and the Rights Agent.

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

        Subject to the provisions of the Agreement, the Board of Directors may,
at its option, (i) redeem the Rights evidenced by this Right Certificate at a
redemption price of $.01 per Right or (ii) exchange Common Shares for the Rights
evidenced by this Certificate, in whole or in part.

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

        No holder of this Right Certificate, as such, shall be entitled to vote
or receive dividends or be deemed for any purpose the holder of the Preferred
Shares 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 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
Agreement), or to receive dividends or subscription rights, or otherwise, until
the Right or Rights evidenced by this Right Certificate shall have been
exercised as provided in the Agreement.

        If any term, provision, covenant or restriction of the 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 the Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

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



                                      B-2
<PAGE>   45
        WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal. Dated as of _______________.



Attest:                                      GERON CORPORATION


By                                           By
   ----------------------------------           --------------------------------
   Title:                                       Title:


Countersigned:

U.S. Stock Transfer Corporation, as Rights Agent


By
   ----------------------------------
    Authorized Signature



                                      B-3
<PAGE>   46
                   [Form of Reverse Side of Right Certificate]

                               FORM OF ASSIGNMENT

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

FOR VALUE RECEIVED
                  --------------------------------------------------------------
hereby sells, assigns and transfers unto
                                        ----------------------------------------

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

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


                         (Please print name and address
                                 of transferee)

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

Dated:
      ------------------

                                    --------------------------------------------
                                    Signature

Signature Medallion Guaranteed:

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

        Signatures must be medallion guaranteed by an "eligible guarantor
institution" as defined in Rule 17Ad-15 promulgated under the Securities
Exchange Act of 1934, as amended.


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

The undersigned hereby certifies that:

        (1) the Rights evidenced by this Right Certificate are not beneficially
owned by and are not being assigned to an Acquiring Person or an Affiliate or an
Associate thereof; and

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

Dated:
      ------------------

                                    --------------------------------------------
                                    Signature


                                      B-4
<PAGE>   47
                          FORM OF ELECTION TO PURCHASE

                      (To be executed if holder desires to
                        exercise the Right Certificate.)

To: Geron Corporation

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


------------------------------------------------------------
(Please print name and address)

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

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

Please insert social security
or other identifying number


------------------------------------------------------------
(Please print name and address)


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

Dated:
      ------------------

                                    --------------------------------------------
                                    Signature

Signature Medallion Guaranteed:

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

        Signatures must be medallion guaranteed by an "eligible guarantor
institution" as defined in Rule 17Ad-15 promulgated under the Securities
Exchange Act of 1934, as amended.



                                      B-5
<PAGE>   48
The undersigned hereby certifies that:

        (1) the Rights evidenced by this Right Certificate are not beneficially
owned by and are not being assigned to an Acquiring Person or an Affiliate or an
Associate thereof; and

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

Dated:
        ------------------


                                    --------------------------------------------
                                    Signature



                                     NOTICE

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

        In the event the certification set forth above in the Form of Assignment
or Form of Election to Purchase is not completed, the Company will deem the
beneficial owner of the Rights evidenced by this Right Certificate to be an
Acquiring Person or an Affiliate or Associate hereof and such Assignment or
Election to Purchase will not be honored.



                                      B-6
<PAGE>   49
                                                                       EXHIBIT C



           As described in the Rights Agreement, Rights which are held
            by or have been held by an Acquiring Person or Associates
         or Affiliates thereof (as defined in the Rights Agreement) and
    certain transferees thereof shall become null and void and will no longer
                                be transferable.


                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES

        On July 20, 2001, the Board of Directors of Geron Corporation (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each share of common stock, $.001 par value (the "Common Shares"), of the
Company outstanding at the close of business on July 31, 2001 (the "Record
Date"). As long as the Rights are attached to the Common Shares, the Company
will issue one Right (subject to adjustment) with each new Common Share so that
all such shares will have attached Rights. When exercisable, each Right will
entitle the registered holder to purchase from the Company one one-thousandth of
a share of Series A Junior Participating Preferred Stock (the "Preferred
Shares") at a price of $100.00 per one one-thousandth of a Preferred Share,
subject to adjustment (the "Purchase Price"). The description and terms of the
Rights are set forth in a Rights Agreement, dated as of July 20, 2001, as the
same may be amended from time to time (the "Agreement"), between the Company and
U.S. Stock Transfer Corporation, as Rights Agent (the "Rights Agent").

        Until the earlier to occur of (i) ten (10) days following a public
announcement that a person or group of affiliated or associated persons has
acquired, or obtained the right to acquire, beneficial ownership of 15% or more
of the Common Shares (an "Acquiring Person"), subject to limited exceptions, or
(ii) ten (10) business days (or such later date as may be determined by action
of the Board of Directors prior to such time as any person or group of
affiliated persons becomes an Acquiring Person) following the commencement or
announcement of an intention to make a tender offer or exchange offer the
consummation of which would result in the beneficial ownership by a person or
group of 15% or more of the Common Shares, subject to limited exceptions (the
earlier of (i) and (ii) being called the "Distribution Date"), the Rights will
be evidenced, with respect to any of the Common Share certificates outstanding
as of the Record Date, by such Common Share certificate together with a copy of
this Summary of Rights.

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



                                      C-1
<PAGE>   50
Shares as of the close of business on the Distribution Date and such separate
Right Certificates alone will evidence the Rights.

        The Rights are not exercisable until the Distribution Date. The Rights
will expire on July 31, 2011, subject to the Company's right to extend such date
(the "Final Expiration Date"), unless earlier redeemed or exchanged by the
Company or terminated.

        Each Preferred Share purchasable upon exercise of the Rights will be
entitled, when, as and if declared, to a minimum preferential quarterly dividend
payment of $1.00 per share but will be entitled to an aggregate dividend of
1,000 times the dividend, if any, declared per Common Share. In the event of
liquidation, dissolution or winding up of the Company, the holders of the
Preferred Shares will be entitled to a minimum preferential liquidation payment
of $1,000 per share (plus any accrued but unpaid dividends) but will be entitled
to an aggregate payment of 1,000 times the payment made per Common Share. Each
Preferred Share will have 1,000 votes and will vote together with the Common
Shares. Finally, in the event of any merger, consolidation or other transaction
in which Common Shares are exchanged, each Preferred Share will be entitled to
receive 1,000 times the amount received per Common Share. Preferred Shares will
not be redeemable. These rights are protected by customary antidilution
provisions. Because of the nature of the Preferred Share's dividend, liquidation
and voting rights, the value of one one-thousandth of a Preferred Share
purchasable upon exercise of each Right should approximate the value of one
Common Share.

        The Purchase Price payable, and the number of Preferred Shares 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
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for or purchase Preferred Shares or convertible
securities at less than the current market price of the Preferred Shares or
(iii) upon the distribution to holders of the Preferred Shares of evidences of
indebtedness, cash, securities or assets (excluding regular periodic cash
dividends at a rate not in excess of 125% of the rate of the last regular
periodic cash dividend theretofore paid or, in case regular periodic cash
dividends have not theretofore been paid, at a rate not in excess of 50% of the
average net income per share of the Company for the four quarters ended
immediately prior to the payment of such dividend, or dividends payable in
Preferred Shares (which dividends will be subject to the adjustment described in
clause (i) above)) or of subscription rights or warrants (other than those
referred to above).

        In the event that a Person becomes an Acquiring Person or if the Company
were the surviving corporation in a merger with an Acquiring Person or any
affiliate or associate of an Acquiring Person and the Common Shares were not
changed or exchanged, each holder of a Right, other than Rights that are or were
acquired or beneficially owned by the Acquiring Person (which Rights will
thereafter be void), will thereafter have the right to receive upon exercise
that number of Common Shares having a market value of two times the then current
Purchase Price of the Right. In the event that, after a person has become an
Acquiring Person, the Company were acquired in a merger or other business
combination transaction or more than 50% of its assets or earning power were
sold, proper provision shall be made so that each holder of a Right shall
thereafter have the right to receive, upon the exercise thereof at the then
current Purchase



                                      C-2
<PAGE>   51
Price of the Right, that number of shares of common stock of the acquiring
company which at the time of such transaction would have a market value of two
times the then current Purchase Price of the Right.

        At any time after a Person becomes an Acquiring Person and prior to the
earlier of one of the events described in the last sentence of the previous
paragraph or the acquisition by such Acquiring Person of 50% or more of the
outstanding Common Shares, the Board of Directors may cause the Company to
exchange the Rights (other than Rights owned by an Acquiring Person which will
have become void), in whole or in part, for Common Shares at an exchange rate of
one Common Share per Right (subject to adjustment).

        No adjustment in the Purchase Price will be required until cumulative
adjustments require an adjustment of at least 1% in such Purchase Price. No
fractional Preferred Shares or Common Shares will be issued (other than
fractions of Preferred Shares which are integral multiples of one one-thousandth
of a Preferred Share, which may, at the election of the Company, be evidenced by
depository receipts), and in lieu thereof, a payment in cash will be made based
on the market price of the Preferred Shares or Common Shares on the last trading
date prior to the date of exercise.

        The Rights may be redeemed in whole, but not in part, at a price of $.01
per Right (the "Redemption Price") by the Board of Directors at any time prior
to the time that an Acquiring Person has become such. The redemption of the
Rights may be made effective at such time, on such basis and with such
conditions as the Board of Directors in its sole discretion may establish.
Immediately upon any 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.

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

        Any of the provisions of the Agreement may be amended by the Board of
Directors of the Company for so long as the Rights are then redeemable, and
after the Rights are no longer redeemable, the Company may amend or supplement
the Agreement in any manner that does not adversely affect the interests of the
holders of the Rights (other than an Acquiring Person or an affiliate or
associate of an Acquiring Person). The Company may at any time prior to such
time as any person becomes an Acquiring Person amend the Agreement to lower the
thresholds described above to no less than the greater of (i) any percentage
greater than the largest percentage of the outstanding Common Shares then known
by the Company to be beneficially owned by any person or group of affiliated or
associated persons (other than an Exempt Person) and (ii) 10%.

        A copy of the Agreement has been filed with the Securities and Exchange
Commission as an Exhibit to a Current Report on Form 8-K. A copy of the
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 Agreement, which is incorporated herein by reference.


                                      C-3