Document:

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                                  EXHIBIT 4.5

                 CONFIDENTIALITY AGREEMENT BY AND BETWEEN FIRST
                   UNION SECURITIES INC., ACTING ON BEHALF OF
                        THE COMPANY, AND INTERPOOL, INC.
                          DATED AS OF JANUARY 4, 2000
<PAGE>   2
                                                       CONFIDENTIALITY AGREEMENT

First Union Securities, Inc.
101 South Tryon Street, 40th Floor
Charlotte, North Carolina 28280

Ladies and Gentlemen:

     The Cronos Group ("Cronos") and Interpool, Inc. (the "Company") are
interested in discussing and evaluating the potential sale of Cronos to the
Company and/or an affiliate of the Company or a business combination
transaction involving Cronos and the Company and/or an affiliate of the Company.
In connection with such negotiations ("Negotiations"), information of a
confidential nature has been and/or will be disclosed by Cronos (the term
"Cronos" including, for purposes of this Agreement, all of its directly and
indirectly owned subsidiaries and other affiliates and all of its and its
directly and indirectly owned subsidiaries' and other affiliates' officers,
employees, representatives and other agents) to the Company (the term "Company"
including, for purposes of this Agreement, all of its directly and indirectly
owned subsidiaries and other affiliates) or its Agents (as hereinafter
defined). In consideration of Cronos providing such information to the Company
and its Agents and in order to protect Cronos's interests therein, the Company
and Cronos hereby agree as follows:

     1.   All information disclosed or transmitted by Cronos, whether verbally
or in written, electronic, recorded or other form, to the Company or any of its
Agents, including without limitation all financial information, marketing
information, customer and supplier information, manufacturing and technical
information and intellectual property, whether prior to, on or after the date
hereof and whether or not in writing (collectively, the "Confidential
Information") shall be treated by the Company and its Agents as set forth in
this Agreement. As used herein, the term "Confidential Information" shall also
include all analyses, records, compilations, studies, notes or other documents
(whether in written, electronic, recorded or other form) whatever prepared by
the Company or its Agents which contain or otherwise reflect Confidential
Information.

     2.   Except as required by law, including the Securities Exchange Act of
1934, as amended, and the rules and regulations promulgated thereunder
(collectively, the "Exchange Act") and the rules and regulations of any national
securities exchange or over-the-counter market, without the prior written
consent of Cronos, (a) the Company shall keep confidential and shall not
disclose any Confidential Information to any third person or entity (private or
governmental) except to such of its or its directly and indirectly owned
subsidiaries' and other affiliates' officers, directors, employees, agents,
advisors or other representatives, including without limitation accountants,
attorneys, business consultants and financial advisors (all the foregoing,
"Agents") who need to know the Confidential Information for the purposes
contemplated by this Agreement, who are informed of the confidential nature of
the Confidential Information and who agree to be bound by the restrictions of
this Agreement; and (b) the Company and its Agents shall use the Confidential
Information only for the purposes contemplated by this Agreement and in no event
in any way detrimental to Cronos or for any other purpose, commercial or
otherwise. Each of these parties agrees that, except as deemed necessary by such
party's counsel to comply with applicable law (including the Exchange Act) or
the rules and regulations of any national securities exchange or
over-the-counter market, it would not disclose to any party that
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                                                       CONFIDENTIALITY AGREEMENT
                                                                          Page 2

negotiations are taking, or have taken, place between the parties and the terms
and status thereof, including the fact that this Agreement has been entered
into (collectively, the "Other Information").

        3. This Agreement shall be inoperative as to any Confidential
Information which (a) is or becomes available or known publicly without a
breach of this Agreement by the Company or its Agents, or (b) is subsequently
disclosed to the Company by a third person or entity who is known by the
Company to be not prohibited from disclosing same by a contractual, fiduciary
or other legal obligation to Cronos, or (c) is independently developed by the
Company without reference to the Confidential Information. In addition, nothing
in this Agreement shall be construed to limit the ability of the Company to
make such disclosures as are deemed necessary or appropriate by its counsel to
comply with the Exchange Act, including, without limitation, in connection with
a tender offer or proxy or consent solicitation.

        4. Each of the parties shall be responsible for any breach of this
Agreement by any of its Agents, including those who become former Agents after
the date hereof. In addition, (a) the Company shall, at its sole expense, take
all reasonable actions, including without limitation court proceedings, to
restrain its Agents and former Agents from unauthorized disclosure or use of
the Confidential Information, and (b) each of the parties shall, at such
party's sole expense, take all reasonably actions, including without
limitation, court proceedings, to restrain its Agents from unauthorized
disclosure of the Other Information.

        5. Any Confidential Information provided to the Company or its Agents
shall be returned (with all copies, extracts or other whole or partial
reproductions thereof) to Cronos, and the Company and its Agents shall destroy
all analyses, records, compilations, studies, notes or other documents (whether
in written, electronic, recorded or other form) prepared by or for the Company
which contain or are based on any Confidential Information and provide Cronos
with a certificate of an officer of the Company to the effect that all such
Confidential Information has been returned or destroyed as required, all within
thirty days of receipt by the Company of a written request therefor from Cronos.

        6. Nothing in this Agreement shall give the Company any right, title,
license or interest whatever in or to the Confidential Information (which shall
remain at all times the property of Cronos) or in or to any existing or future
patents, know-how, inventions or other intellectual property of Cronos.

        7. If a party or any of its Agents is requested, or upon the advice of
legal counsel, is required, in any court proceeding (e.g., by oral questions,
interrogatories, requests for information or documents, subpoena or the like),
by any government agency or authority or by law (other than the Exchange Act) to
disclose any of the Confidential Information or Other Information, as the case
may be, the disclosing party shall promptly so notify the other party so that
the other party may seek appropriate protective relief or waive compliance with
the applicable provisions of this Agreement for such situation. If the other
party does not obtain such relief on a timely basis, the disclosing party may
disclose only that portion of the Confidential Information or Other Information,
as the case may be, which its legal counsel
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                                                       CONFIDENTIALITY AGREEMENT
                                                                          Page 3

advises must be disclosed and the disclosing party will use its reasonable
efforts to obtain satisfactory assurances that the Confidential Information or
Other Information, as the case may be, will be maintained in confidence
following its required disclosure. The provisions of this paragraph 7 shall not
apply to any disclosure permitted to be made pursuant to the introductory
proviso of paragraph 2.

     8.   The obligations of a party not to use or disclose (including not to
allow the use or disclosure by its Agents), and to return on request or
destroy, the Confidential Information or the Other Information shall continue
for a period of three years from the date hereof.

     9.   For a period of one year from the date hereof, the Company shall not
solicit for hire or hire as a director, officer, employee, independent
contractor, consultant or advisor any person employed by Cronos on the date
hereof in an executive or significant managerial, financial, sales, marketing,
engineering, research, development, manufacturing or technical position with
whom the Company has had contact or who  becomes known to the Company in
connection with the Negotiations. However, the foregoing provisions of this
paragraph shall not prevent the Company from hiring any such person, who, at
the time of the initial contact with the Company regarding employment, is
responding to (a) a general advertisement or other non-directed search inquiry
or (b) who is no longer employed by Cronos and, at the time of such contact, had
not been employed by Cronos for at least three months.

     10.  The Company understands that Cronos shall endeavor to assure that any
Confidential Information or other information provided to the Company pursuant
to this Agreement will be accurate and relevant for the purposes contemplated
by this Agreement but acknowledges that Cronos is not making any representation
or warranty as to, and shall not have liability in regard to, the accuracy or
completeness of such Confidential Information or other information.

     11.  The Company understands that no contract or agreement providing for
any transaction with Cronos shall be deemed to exist between the parties unless
and until a definitive agreement has been executed and delivered by both
parties. Only representations and warranties, if any, hereafter made in such
definitive agreement shall have any legal effect and agrees that Cronos may
establish procedures and guidelines for the submission of proposals with respect
to the transaction contemplated by this Agreement and may change those
procedures at any time without prior notice. The Company and its representatives
shall act in accordance with these procedures and agree to be bound by the terms
and conditions thereof. The Company further acknowledges that Cronos is free to
conduct the process leading up to a possible sale of Cronos as Cronos, in it
sole discretion, determines, including, without limitation, the negotiation and
entering into of any preliminary or definitive agreement with any other person
or entity without prior notice to the Company. Unless and until complete and
definitive written agreements for an actual sale and purchase of Cronos between
Cronos and the Company have been formally prepared, executed and delivered by
both parties, after approval by their respective Board of Directors, (a) each
has the right, in its sole discretion, to reject any proposal from the other
and/or to terminate the Negotiations at any time, and (b) neither will have any
further legal obligation of any sort except for the matters specifically agreed
to in this Agreement. Only
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                                                       CONFIDENTIALITY AGREEMENT
                                                                          Page 4

representations and warranties, if any, hereafter made in such definitive
agreements shall have any legal effect.

     12.  Each of the parties shall advise their Agents who are aware or become
aware of the Negotiations and/or to whom Confidential Information or the Other
Information is disclosed, that United States securities laws prohibit them, as
recipients from an issuer of material, non-public information regarding that
issuer, from buying or selling securities of that issuer or from communicating
such material, non-public information to any other person where it is
reasonably likely or foreseeable that such person may purchase or sell such
securities in reliance upon such information.

     13.  The Company agrees, during the Standstill Period (as defined below),
that it shall not, alone or through or with any other person or entity, in any
manner, without the prior written consent of Cronos:

          (i)   acquire, offer to acquire, or agree to acquire, directly or
indirectly, by purchase or otherwise, any voting securities of Cronos or any
subsidiary thereof, or any assets of Cronos or any subsidiary or division
thereof;

          (ii)  file with the SEC or mail a proxy statement relating to the
solicitation of proxies by the Company from the shareholders of Cronos to be
used at the 1999 Annual Meeting of Shareholders of Cronos in support of the
election of the Company's nominees (as set forth in the Company's preliminary
proxy statement filed with the SEC on August 24, 1999 as amended December 3,
1999) to the Board of Directors of Cronos;

          (iii) make any public announcement with respect to, or submit a
proposal for, or offer of (with or without conditions) any extraordinary
transaction involving Cronos or its securities or assets: (1) act, directly or
indirectly, to seek to control, direct or influence the management, Board of
Directors, stockholders, policies or affairs of Cronos or communicate with any
of the shareholders of Cronos; or

          (iv)  form, join or in any way participate in a "group" as defined
in Section 13(d)(3) of the Exchange Act) in connection with any of the
foregoing.

The foregoing provisions shall not prohibit or otherwise prevent the
Negotiations as contemplated by this Agreement, between Cronos and the Company.
The Company and Cronos each agree that during the Standstill Period not to
initiate any legal action against the other in any court or jurisdiction except
to the extent necessary to enforce the provisions of this Agreement.

As used in this Agreement, the term "Standstill Period" shall mean the period
beginning on the date of this Agreement and ending the earlier of (i) such date
that it is publicly announced, whether by press release, filing with the SEC or
otherwise, that Cronos or any affiliate thereof has entered into a letter of
intent, agreement in principle or any other agreement with any party with
respect to a Competing Transaction (as hereafter defined), (ii) such date that
any person or
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                                                       CONFIDENTIALITY AGREEMENT
                                                                          Page 5

"group" (as defined in Section 13(d)(3) of the Exchange Act), other than the
Company or its affiliates or any group of which any of the Company or its
affiliates is a member, shall have acquired or announced its intention to
acquire (including by commencement of a tender or exchange offer) beneficial
ownership (as determined pursuant to Rule 13d-3 promulgated under the Exchange
Act) of 25% or more of Cronos's common stock, (iii) 11:58 p.m., New York City
Cronos, on April 30, 2000. For the purposes of this Agreement,  "Competing
Transaction" shall mean any of the following: (i) any merger, consolidation,
share exchange, recapitalization, restructuring, liquidation, dissolution,
business combination, joint venture or other extraordinary transaction involving
Cronos or any of its subsidiaries; (ii) any sale, lease, exchange, mortgage,
pledge, transfer or other disposition of a significant portion of the assets of
Cronos and its subsidiaries, taken as a whole, in a single transaction or series
of related transactions; (iii) any tender or exchange offer for 25% percent or
more of the outstanding shares of capital stock of Cronos made by any Person
(including Cronos or any affiliate thereof); (iv) any transaction by which any
Person would acquire the ability to elect a majority of the members of Cronos's
Board of Directors; (v) any sale or proposed sale of equity securities
representing, or securities convertible, exchangeable or representing the right
to acquire, more than 25% of the equity capitalization of Cronos; or (vi) any
similar business combination or extraordinary transaction.

In consideration for entering into the Standstill Period agreement, Cronos
agrees to allow the Company to conduct such due diligence as is reasonable and
customary.

     14.  The Company agrees that Cronos shall not be obligated to pay any fees
on its behalf to any brokers, finders, or other parties claiming to represent
the Company in the transaction contemplated by this Agreement, unless otherwise
agreed to in a subsequent agreement.

     15.  In the event of any breach of any provision of this Agreement, the
parties acknowledge and agree that money damages would not be a sufficient
remedy, and the non-breaching party shall therefore be entitled to equitable
relief, including in the form of injunctions and orders for specific
performance and without the necessity of posting any bond, in an action
instituted in any court having subject matter jurisdiction, in addition to all
other remedies available to the non-breaching party with respect thereto at law
or in equity. Except as otherwise provided herein, this Agreement shall
terminate one year from the date hereof, provided that the expiration of any
period of time specified in this Agreement is not intended to terminate the
rights and obligations of either party hereto in regard to any breaches of
this Agreement occurring prior to the expiration of such period, which rights
and obligations shall continue.

     16.  No failure or delay by either party hereto in exercising in whole or
in part any right, power or privilege hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise or waiver thereof preclude
any other or further exercise thereof or the exercise of any other right, power
or privilege hereunder or at law or in equity. Either party hereto may at any
time waive compliance by the other with any covenant, condition or agreement
contained in this Agreement, but only by a written instrument executed by the
party expressly waiving such compliance.
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                                                       CONFIDENTIALITY AGREEMENT
                                                                          Page 6

     17. This Agreement shall be governed by, and interpreted and enforced in
accordance with, the local laws of the State of California applicable to
contracts to be performed fully within such state and without regard to the
conflicts of law provisions thereof or of any other jurisdictions.

     18. This Agreement will be binding upon and inure to the benefit of the
parties hereto and their respective successors and permitted assigns. This
Agreement may not be assigned or otherwise transferred by either party hereto
(including by operation of law) without the prior written consent of the
non-assigning party. No assignment will in any event relieve the assigning party
of any of its obligations hereunder without the prior written consent of the
non-assigning party. No assignment will in any event relieve the assigning party
of any of its obligations hereunder without the prior written consent of the
non-assigning party. The language used in this Agreement was selected by the
parties jointly, and no presumptions of legal construction or interpretation are
intended to, or shall, apply against either party as the author hereof. If any
provision of this Agreement shall be determined to be invalid or unenforceable,
it shall not affect the remainder of this Agreement, which shall continue in
full force and effect. This Agreement will be executed in two or more
counterparts, any or all of which shall constitute one and the same instrument.

     19. This Agreement supersedes any other representation, warranty,
agreement, commitment, arrangement or understanding of any sort whatever,
whether written or oral, that may have been made or entered into by either
Cronos or the Company or its Agents relating to the matters contemplated
hereby, but not limited to, (i) the Confidentiality Agreement dated November
15, 1996 by and among the Company, Cronos and Stephen M. Palatin, and (ii) the
Mutual Nondisclosure Agreement dated as of May 20, 1999 by and between the
Company and Cronos. This Agreement constitutes the entire understanding and
agreement of the parties with respect to the subject matter hereof, and there
are no representations, warranties, agreements, commitments, arrangements or
understandings except as expressly set forth herein. This Agreement may not be
amended orally, but only by a written instrument executed by both parties
hereto expressly setting forth such amendment.
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                                                       CONFIDENTIALITY AGREEMENT
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     If the foregoing agreement is acceptable, please sign both copies of this
letter, and return one to me at the above address.

FIRST UNION SECURITIES, INC. as agent for THE CRONOS GROUP

By:  /s/ RAYMOND C. GROTH
     -----------------------------
     Raymond C. Groth
     Managing Director

The foregoing is hereby accepted and agreed to
as of Jan 9, 2000.

Interpool, Inc.

By:  /s/ MITCHELL L. GORDON
     -----------------------------
     Mitchell L. Gordon
     Director<PAGE>   1
                                                                    EXHIBIT 10.1

                            SANGAMO BIOSCIENCES, INC.

                            2000 STOCK INCENTIVE PLAN

                                   ARTICLE ONE

                               GENERAL PROVISIONS

        I.     PURPOSE OF THE PLAN

               This 2000 Stock Incentive Plan is intended to promote the
interests of Sangamo BioSciences, Inc., a Delaware corporation, by providing
eligible persons in the Corporation's service with the opportunity to acquire a
proprietary interest, or otherwise increase their proprietary interest, in the
Corporation as an incentive for them to remain in such service.

               Capitalized terms shall have the meanings assigned to such terms
in the attached Appendix.

        II.    STRUCTURE OF THE PLAN

               A. The Plan shall be divided into five separate equity incentives
programs:

                      - the Discretionary Option Grant Program under which
eligible persons may, at the discretion of the Plan Administrator, be granted
options to purchase shares of Common Stock,

                      - the Salary Investment Option Grant Program under which
eligible employees may elect to have a portion of their base salary invested
each year in special option grants,

                      - the Stock Issuance Program under which eligible persons
may, at the discretion of the Plan Administrator, be issued shares of Common
Stock directly, either through the immediate purchase of such shares or as a
bonus for services rendered the Corporation (or any Parent or Subsidiary),

                      - the Automatic Option Grant Program under which eligible
non-employee Board members shall automatically receive option grants at
designated intervals over their period of continued Board service, and

                      - the Director Fee Option Grant Program under which
non-employee Board members may elect to have all or any portion of their annual
retainer fee otherwise payable in cash applied to a special stock option grant.

<PAGE>   2

               B. The provisions of Articles One and Seven shall apply to all
equity programs under the Plan and shall govern the interests of all persons
under the Plan.

        III.   ADMINISTRATION OF THE PLAN

               A. The Primary Committee shall have sole and exclusive authority
to administer the Discretionary Option Grant and Stock Issuance Programs with
respect to Section 16 Insiders. Administration of the Discretionary Option Grant
and Stock Issuance Programs with respect to all other persons eligible to
participate in those programs may, at the Board's discretion, be vested in the
Primary Committee or a Secondary Committee, or the Board may retain the power to
administer those programs with respect to all such persons. However, any
discretionary option grants or stock issuances for members of the Primary
Committee must be authorized by a disinterested majority of the Board.

               B. Members of the Primary Committee or any Secondary Committee
shall serve for such period of time as the Board may determine and may be
removed by the Board at any time. The Board may also at any time terminate the
functions of any Secondary Committee and reassume all powers and authority
previously delegated to such committee.

               C. Each Plan Administrator shall, within the scope of its
administrative functions under the Plan, have full power and authority (subject
to the provisions of the Plan) to establish such rules and regulations as it may
deem appropriate for proper administration of the Discretionary Option Grant and
Stock Issuance Programs and to make such determinations under, and issue such
interpretations of, the provisions of those programs and any outstanding options
or stock issuances thereunder as it may deem necessary or advisable. Decisions
of the Plan Administrator within the scope of its administrative functions under
the Plan shall be final and binding on all parties who have an interest in the
Discretionary Option Grant and Stock Issuance Programs under its jurisdiction or
any stock option or stock issuance thereunder.

               D. The Primary Committee shall have the sole and exclusive
authority to determine which Section 16 Insiders and other highly compensated
Employees shall be eligible for participation in the Salary Investment Option
Grant Program for one or more calendar years. However, all option grants under
the Salary Investment Option Grant Program shall be made in accordance with the
express terms of that program, and the Primary Committee shall not exercise any
discretionary functions with respect to the option grants made under that
program.

               E. Service on the Primary Committee or the Secondary Committee
shall constitute service as a Board member, and members of each such committee
shall accordingly be entitled to full indemnification and reimbursement as Board
members for their service on such committee. No member of the Primary Committee
or the Secondary Committee shall be liable for any act or omission made in good
faith with respect to the Plan or any option grants or stock issuances under the
Plan.

                                       2
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               F. Administration of the Automatic Option Grant and Director Fee
Option Grant Programs shall be self-executing in accordance with the terms of
those programs, and no Plan Administrator shall exercise any discretionary
functions with respect to any option grants or stock issuances made under those
programs.

        IV.    ELIGIBILITY

               A. The persons eligible to participate in the Discretionary
Option Grant and Stock Issuance Programs are as follows:

                             (i) Employees,

                             (ii) non-employee members of the Board or the board
        of directors of any Parent or Subsidiary, and

                             (iii) consultants and other independent advisors
        who provide services to the Corporation (or any Parent or Subsidiary).

               B. Only Employees who are Section 16 Insiders or other highly
compensated individuals shall be eligible to participate in the Salary
Investment Option Grant Program.

               C. Each Plan Administrator shall, within the scope of its
administrative jurisdiction under the Plan, have full authority to determine,
(i) with respect to the option grants under the Discretionary Option Grant
Program, which eligible persons are to receive such grants, the time or times
when those grants are to be made, the number of shares to be covered by each
such grant, the status of the granted option as either an Incentive Option or a
Non-Statutory Option, the time or times when each option is to become
exercisable, the vesting schedule (if any) applicable to the option shares and
the maximum term for which the option is to remain outstanding and (ii) with
respect to stock issuances under the Stock Issuance Program, which eligible
persons are to receive such issuances, the time or times when the issuances are
to be made, the number of shares to be issued to each Participant, the vesting
schedule (if any) applicable to the issued shares and the consideration for such
shares.

               D. The Plan Administrator shall have the absolute discretion
either to grant options in accordance with the Discretionary Option Grant
Program or to effect stock issuances in accordance with the Stock Issuance
Program.

               E. The individuals who shall be eligible to participate in the
Automatic Option Grant Program shall be limited to (i) those individuals who
first become non-employee Board members on or after the Underwriting Date,
whether through appointment by the Board or election by the Corporation's
stockholders, and (ii) those individuals who continue to serve as non-employee
Board members at one or more Annual Stockholders Meetings held after the
Underwriting Date. A non-employee Board member who has previously been in the
employ of the Corporation (or any Parent or Subsidiary) shall not be eligible to
receive an option grant

                                       3
<PAGE>   4
under the Automatic Option Grant Program at the time he or she first becomes a
non-employee Board member, but shall be eligible to receive periodic option
grants under the Automatic Option Grant Program while he or she continues to
serve as a non-employee Board member.

               F. All non-employee Board members shall be eligible to
participate in the Director Fee Option Grant Program.

        V.     STOCK SUBJECT TO THE PLAN

               A. The stock issuable under the Plan shall be shares of
authorized but unissued or reacquired Common Stock, including shares repurchased
by the Corporation on the open market. The number of shares of Common Stock
initially reserved for issuance over the term of the Plan shall not exceed
4,161,666 shares. Such reserve shall consist of (i) the number of shares
estimated to remain available for issuance, as of the Plan Effective Date, under
the Predecessor Plan as last approved by the Corporation's stockholders,
including the shares subject to outstanding options under the Predecessor Plan,
(ii) plus an additional increase of approximately 1,129,926 shares to be
approved by the Corporation's stockholders prior to the Underwriting Date.

               B. The number of shares of Common Stock available for issuance
under the Plan shall automatically increase on the first trading day of each
fiscal year of the Corporation during the term of the Plan, beginning with
fiscal year 2001, by an amount equal to three and one-half percent (3.5%) of the
total number of shares of Common Stock outstanding on the last trading day of
the immediately preceding fiscal year, but in no event shall any such annual
increase exceed 2,000,000 shares.

               C. No one person participating in the Plan may receive stock
options, separately exercisable stock appreciation rights and direct stock
issuances for more than 2,000,000 shares of Common Stock in the aggregate per
calendar year.

               D. Shares of Common Stock subject to outstanding options
(including options incorporated into this Plan from the Predecessor Plan) shall
be available for subsequent issuance under the Plan to the extent (i) those
options expire or terminate for any reason prior to exercise in full or (ii) the
options are cancelled in accordance with the cancellation-regrant provisions of
Article Two. Unvested shares issued under the Plan and subsequently cancelled or
repurchased by the Corporation at the original issue price paid per share,
pursuant to the Corporation's repurchase rights under the Plan shall be added
back to the number of shares of Common Stock reserved for issuance under the
Plan and shall accordingly be available for reissuance through one or more
subsequent option grants or direct stock issuances under the Plan. However,
should the exercise price of an option under the Plan be paid with shares of
Common Stock or should shares of Common Stock otherwise issuable under the Plan
be withheld by the Corporation in satisfaction of the withholding taxes incurred
in connection with the exercise of an option or the vesting of a stock issuance
under the Plan, then the number of shares of Common Stock available for issuance
under the Plan shall be reduced by the gross number of shares for which the
option is exercised or which vest under the stock issuance, and not by the net
number of shares of Common Stock issued to the holder of such option or stock

                                       4
<PAGE>   5

issuance. Shares of Common Stock underlying one or more stock appreciation
rights exercised under Section IV of Article Two, Section III of Article Three,
Section II of Article Five or Section III of Article Six of the Plan shall NOT
be available for subsequent issuance under the Plan.

               E. If any change is made to the Common Stock by reason of any
stock split, stock dividend, recapitalization, combination of shares, exchange
of shares or other change affecting the outstanding Common Stock as a class
without the Corporation's receipt of consideration, appropriate adjustments
shall be made by the Plan Administrator to (i) the maximum number and/or class
of securities issuable under the Plan, (ii) the maximum number and/or class of
securities for which any one person may be granted stock options, separately
exercisable stock appreciation rights and direct stock issuances under the Plan
per calendar year, (iii) the number and/or class of securities for which grants
are subsequently to be made under the Automatic Option Grant Program to new and
continuing non-employee Board members, (iv) the number and/or class of
securities and the exercise price per share in effect under each outstanding
option under the Plan, (v) the number and/or class of securities and exercise
price per share in effect under each outstanding option incorporated into this
Plan from the Predecessor Plan and (vi) the maximum number and/or class of
securities by which the share reserve is to increase automatically each fiscal
year pursuant to the provisions of Section V.B of this Article One. Such
adjustments to the outstanding options are to be effected in a manner which
shall preclude the enlargement or dilution of rights and benefits under such
options. The adjustments determined by the Plan Administrator shall be final,
binding and conclusive.

                                       5

<PAGE>   6
                                   ARTICLE TWO
                       DISCRETIONARY OPTION GRANT PROGRAM

        I.     OPTION TERMS

               Each option shall be evidenced by one or more documents in the
form approved by the Plan Administrator; provided, however, that each such
document shall comply with the terms specified below. Each document evidencing
an Incentive Option shall, in addition, be subject to the provisions of the Plan
applicable to such options.

               A. EXERCISE PRICE.

                      1. The exercise price per share shall be fixed by the Plan
Administrator but shall not be less than one hundred percent (100%) of the Fair
Market Value per share of Common Stock on the option grant date.

                      2. The exercise price shall become immediately due upon
exercise of the option and shall, subject to the provisions of Section I of
Article Seven and the documents evidencing the option, be payable in one or more
of the forms specified below:

                             (i) cash or check made payable to the Corporation,

                             (ii) shares of Common Stock held for the requisite
        period necessary to avoid a charge to the Corporation's earnings for
        financial reporting purposes and valued at Fair Market Value on the
        Exercise Date, or

                             (iii) to the extent the option is exercised for
        vested shares, through a special sale and remittance procedure pursuant
        to which the Optionee shall concurrently provide irrevocable
        instructions to (a) a Corporation-designated brokerage firm to effect
        the immediate sale of the purchased shares and remit to the Corporation,
        out of the sale proceeds available on the settlement date, sufficient
        funds to cover the aggregate exercise price payable for the purchased
        shares plus all applicable Federal, state and local income and
        employment taxes required to be withheld by the Corporation by reason of
        such exercise and (b) the Corporation to deliver the certificates for
        the purchased shares directly to such brokerage firm in order to
        complete the sale.

               Except to the extent such sale and remittance procedure is
utilized, payment of the exercise price for the purchased shares must be made on
the Exercise Date.

               B. EXERCISE AND TERM OF OPTIONS. Each option shall be exercisable
at such time or times, during such period and for such number of shares as shall
be determined by the

                                       6
<PAGE>   7
Plan Administrator and set forth in the documents evidencing the option.
However, no option shall have a term in excess of ten (10) years measured from
the option grant date.

               C.     EFFECT OF TERMINATION OF SERVICE.

                      1. The following provisions shall govern the exercise of
any options held by the Optionee at the time of cessation of Service or death:

                             (i) Any option outstanding at the time of the
        Optionee's cessation of Service for any reason shall remain exercisable
        for such period of time thereafter as shall be determined by the Plan
        Administrator and set forth in the documents evidencing the option, but
        no such option shall be exercisable after the expiration of the option
        term.

                             (ii) Any option held by the Optionee at the time of
        death and exercisable in whole or in part at that time may be
        subsequently exercised by the personal representative of the Optionee's
        estate or by the person or persons to whom the option is transferred
        pursuant to the Optionee's will or the laws of inheritance or by the
        Optionee's designated beneficiary or beneficiaries of that option.

                             (iii) Should the Optionee's Service be terminated
        for Misconduct or should the Optionee otherwise engage in Misconduct
        while holding one or more outstanding options under this Article Two,
        then all those options shall terminate immediately and cease to be
        outstanding.

                             (iv)   During the applicable post-Service exercise
        period, the option may not be exercised in the aggregate for more than
        the number of vested shares for which the option is exercisable on the
        date of the Optionee's cessation of Service. Upon the expiration of the
        applicable exercise period or (if earlier) upon the expiration of the
        option term, the option shall terminate and cease to be outstanding for
        any vested shares for which the option has not been exercised. However,
        the option shall, immediately upon the Optionee's cessation of Service,
        terminate and cease to be outstanding to the extent the option is not
        otherwise at that time exercisable for vested shares.

                      2. The Plan Administrator shall have complete discretion,
exercisable either at the time an option is granted or at any time while the
option remains outstanding, to:

                             (i) extend the period of time for which the option
        is to remain exercisable following the Optionee's cessation of Service
        from the limited exercise period otherwise in effect for that option to
        such greater period of time as the Plan Administrator shall deem
        appropriate, but in no event beyond the expiration of the option term,
        and/or

                                       7

<PAGE>   8

                             (ii) permit the option to be exercised, during the
        applicable post-Service exercise period, not only with respect to the
        number of vested shares of Common Stock for which such option is
        exercisable at the time of the Optionee's cessation of Service but also
        with respect to one or more additional installments in which the
        Optionee would have vested had the Optionee continued in Service.

               D. STOCKHOLDER RIGHTS. The holder of an option shall have no
stockholder rights with respect to the shares subject to the option until such
person shall have exercised the option, paid the exercise price and become a
holder of record of the purchased shares.

               E. REPURCHASE RIGHTS. The Plan Administrator shall have the
discretion to grant options which are exercisable for unvested shares of Common
Stock. Should the Optionee cease Service while holding such unvested shares, the
Corporation shall have the right to repurchase, at the exercise price paid per
share, any or all of those unvested shares. The terms upon which such repurchase
right shall be exercisable (including the period and procedure for exercise and
the appropriate vesting schedule for the purchased shares) shall be established
by the Plan Administrator and set forth in the document evidencing such
repurchase right.

               F. LIMITED TRANSFERABILITY OF OPTIONS. During the lifetime of the
Optionee, Incentive Options shall be exercisable only by the Optionee and shall
not be assignable or transferable other than by will or the laws of inheritance
following the Optionee's death. Non-Statutory Options shall be subject to the
same restriction, except that a Non-Statutory Option may be assigned in whole or
in part during the Optionee's lifetime to one or more members of the Optionee's
family or to a trust established exclusively for one or more such family members
or to Optionee's former spouse, to the extent such assignment is in connection
with the Optionee's estate plan or pursuant to a domestic relations order. The
assigned portion may only be exercised by the person or persons who acquire a
proprietary interest in the option pursuant to the assignment. The terms
applicable to the assigned portion shall be the same as those in effect for the
option immediately prior to such assignment and shall be set forth in such
documents issued to the assignee as the Plan Administrator may deem appropriate.
Notwithstanding the foregoing, the Optionee may also designate one or more
persons as the beneficiary or beneficiaries of his or her outstanding options
under this Article Two, and those options shall, in accordance with such
designation, automatically be transferred to such beneficiary or beneficiaries
upon the Optionee's death while holding those options. Such beneficiary or
beneficiaries shall take the transferred options subject to all the terms and
conditions of the applicable agreement evidencing each such transferred option,
including (without limitation) the limited time period during which the option
may be exercised following the Optionee's death.

        II.    INCENTIVE OPTIONS

               The terms specified below shall be applicable to all Incentive
Options. Except as modified by the provisions of this Section II, all the
provisions of Articles One, Two and Seven shall be applicable to Incentive
Options. Options which are specifically designated as Non- Statutory Options
when issued under the Plan shall not be subject to the terms of this Section II.

                                       8
<PAGE>   9

               A. ELIGIBILITY. Incentive Options may only be granted to
Employees.

               B. DOLLAR LIMITATION. The aggregate Fair Market Value of the
shares of Common Stock (determined as of the respective date or dates of grant)
for which one or more options granted to any Employee under the Plan (or any
other option plan of the Corporation or any Parent or Subsidiary) may for the
first time become exercisable as Incentive Options during any one calendar year
shall not exceed the sum of One Hundred Thousand Dollars ($100,000). To the
extent the Employee holds two (2) or more such options which become exercisable
for the first time in the same calendar year, the foregoing limitation on the
exercisability of such options as Incentive Options shall be applied on the
basis of the order in which such options are granted.

               C. 10% STOCKHOLDER. If any Employee to whom an Incentive Option
is granted is a 10% Stockholder, then the exercise price per share shall not be
less than one hundred ten percent (110%) of the Fair Market Value per share of
Common Stock on the option grant date, and the option term shall not exceed five
(5) years measured from the option grant date.

        III.   CORPORATE TRANSACTION/CHANGE IN CONTROL

               A. In the event of any Corporate Transaction, each outstanding
option shall automatically accelerate so that each such option shall,
immediately prior to the effective date of the Corporate Transaction, become
exercisable for all the shares of Common Stock at the time subject to such
option and may be exercised for any or all of those shares as fully vested
shares of Common Stock. However, an outstanding option shall NOT become
exercisable on such an accelerated basis if and to the extent: (i) such option
is, in connection with the Corporate Transaction, to be assumed by the successor
corporation (or parent thereof) or (ii) such option is to be replaced with a
cash incentive program of the successor corporation which preserves the spread
existing at the time of the Corporate Transaction on any shares for which the
option is not otherwise at that time exercisable and provides for subsequent
payout in accordance with the same exercise/vesting schedule applicable to those
option shares or (iii) the acceleration of such option is subject to other
limitations imposed by the Plan Administrator at the time of the option grant.

               B. All outstanding repurchase rights shall automatically
terminate, and the shares of Common Stock subject to those terminated rights
shall immediately vest in full, in the event of any Corporate Transaction,
except to the extent: (i) those repurchase rights are to be assigned to the
successor corporation (or parent thereof) in connection with such Corporate
Transaction or (ii) such accelerated vesting is precluded by other limitations
imposed by the Plan Administrator at the time the repurchase right is issued.

               C. Immediately following the consummation of the Corporate
Transaction, all outstanding options shall terminate and cease to be
outstanding, except to the extent assumed by the successor corporation (or
parent thereof).

                                       9

<PAGE>   10
Each option which is assumed in connection with a Corporate Transaction shall be
appropriately adjusted, immediately after such Corporate Transaction, to apply
to the number and class of securities which would have been issuable to the
Optionee in consummation of such Corporate Transaction had the option been
exercised immediately prior to such Corporate Transaction. Appropriate
adjustments to reflect such Corporate Transaction shall also be made to (i) the
exercise price payable per share under each outstanding option, provided the
aggregate exercise price payable for such securities shall remain the same, (ii)
the maximum number and/or class of securities available for issuance over the
remaining term of the Plan and (iii) the maximum number and/or class of
securities for which any one person may be granted stock options, separately
exercisable stock appreciation rights and direct stock issuances under the Plan
per calendar year and (iv) the maximum number and/or class of securities by
which the share reserve is to increase automatically each fiscal year. To the
extent the actual holders of the Corporation's outstanding Common Stock receive
cash consideration for their Common Stock in consummation of the Corporate
Transaction, the successor corporation may, in connection with the assumption of
the outstanding options under the Discretionary Option Grant Program, substitute
one or more shares of its own common stock with a fair market value equivalent
to the cash consideration paid per share of Common Stock in such Corporate
Transaction.

               E. The Plan Administrator shall have the discretionary authority
to structure one or more outstanding options under the Discretionary Option
Grant Program so that those options shall, immediately prior to the effective
date of such Corporate Transaction, become exercisable for all the shares of
Common Stock at the time subject to those options and may be exercised for any
or all of those shares as fully vested shares of Common Stock, whether or not
those options are to be assumed in the Corporate Transaction. In addition, the
Plan Administrator shall have the discretionary authority to structure one or
more of the Corporation's repurchase rights under the Discretionary Option Grant
Program so that those rights shall not be assignable in connection with such
Corporate Transaction and shall accordingly terminate upon the consummation of
such Corporate Transaction, and the shares subject to those terminated rights
shall thereupon vest in full.

               F. The Plan Administrator shall have full power and authority to
structure one or more outstanding options under the Discretionary Option Grant
Program so that those options shall become exercisable for all the shares of
Common Stock at the time subject to those options in the event the Optionee's
Service is subsequently terminated by reason of an Involuntary Termination
within a designated period (not to exceed eighteen (18) months) following the
effective date of any Corporate Transaction in which those options are assumed
and do not otherwise accelerate. In addition, the Plan Administrator may
structure one or more of the Corporation's repurchase rights so that those
rights shall immediately terminate with respect to any shares held by the
Optionee at the time of his or her Involuntary Termination, and the shares
subject to those terminated repurchase rights shall accordingly vest in full at
that time.

                                       10
<PAGE>   11
The Plan Administrator shall have the discretionary authority to structure one
or more outstanding options under the Discretionary Option Grant Program so that
those options shall, immediately prior to the effective date of a Change in
Control, become exercisable for all the shares of Common Stock at the time
subject to those options and may be exercised for any or all of those shares as
fully vested shares of Common Stock. In addition, the Plan Administrator shall
have the discretionary authority to structure one or more of the Corporation's
repurchase rights under the Discretionary Option Grant Program so that those
rights shall terminate automatically upon the consummation of such Change in
Control, and the shares subject to those terminated rights shall thereupon vest
in full. Alternatively, the Plan Administrator may condition the automatic
acceleration of one or more outstanding options under the Discretionary Option
Grant Program and the termination of one or more of the Corporation's
outstanding repurchase rights under such program upon the subsequent termination
of the Optionee's Service by reason of an Involuntary Termination within a
designated period (not to exceed eighteen (18) months) following the effective
date of such Change in Control.

               H. The portion of any Incentive Option accelerated in connection
with a Corporate Transaction or Change in Control shall remain exercisable as an
Incentive Option only to the extent the applicable One Hundred Thousand Dollar
($100,000) limitation is not exceeded. To the extent such dollar limitation is
exceeded, the accelerated portion of such option shall be exercisable as a
Nonstatutory Option under the Federal tax laws.

               I. The outstanding options shall in no way affect the right of
the Corporation to adjust, reclassify, reorganize or otherwise change its
capital or business structure or to merge, consolidate, dissolve, liquidate or
sell or transfer all or any part of its business or assets.

        IV.    CANCELLATION AND REGRANT OF OPTIONS

               The Plan Administrator shall have the authority to effect, at any
time and from time to time, with the consent of the affected option holders, the
cancellation of any or all outstanding options under the Discretionary Option
Grant Program (including outstanding options incorporated from the Predecessor
Plan) and to grant in substitution new options covering the same or a different
number of shares of Common Stock but with an exercise price per share based on
the Fair Market Value per share of Common Stock on the new grant date.

        V.     STOCK APPRECIATION RIGHTS

               A. The Plan Administrator shall have full power and authority to
grant to selected Optionees tandem stock appreciation rights and/or limited
stock appreciation rights.

               B. The following terms shall govern the grant and exercise of
tandem stock appreciation rights:

                             (i) One or more Optionees may be granted the right,
        exercisable upon such terms as the Plan Administrator may establish, to
        elect between the exercise of the underlying option for shares of Common
        Stock and

                                       11
<PAGE>   12

        the surrender of that option in exchange for a distribution from the
        Corporation in an amount equal to the excess of (a) the Fair Market
        Value (on the option surrender date) of the number of shares in which
        the Optionee is at the time vested under the surrendered option (or
        surrendered portion thereof) over (b) the aggregate exercise price
        payable for such shares.

                             (ii) No such option surrender shall be effective
        unless it is approved by the Plan Administrator, either at the time of
        the actual option surrender or at any earlier time. If the surrender is
        so approved, then the distribution to which the Optionee shall be
        entitled may be made in shares of Common Stock valued at Fair Market
        Value on the option surrender date, in cash, or partly in shares and
        partly in cash, as the Plan Administrator shall in its sole discretion
        deem appropriate.

                             (iii) If the surrender of an option is not approved
        by the Plan Administrator, then the Optionee shall retain whatever
        rights the Optionee had under the surrendered option (or surrendered
        portion thereof) on the option surrender date and may exercise such
        rights at any time prior to the later of (a) five (5) business days
        after the receipt of the rejection notice or (b) the last day on which
        the option is otherwise exercisable in accordance with the terms of the
        documents evidencing such option, but in no event may such rights be
        exercised more than ten (10) years after the option grant date.

               C. The following terms shall govern the grant and exercise of
limited stock appreciation rights:

                             (i) One or more Section 16 Insiders may be granted
        limited stock appreciation rights with respect to their outstanding
        options.

                             (ii) Upon the occurrence of a Hostile Take-Over,
        each individual holding one or more options with such a limited stock
        appreciation right shall have the unconditional right (exercisable for a
        thirty (30)-day period following such Hostile Take-Over) to surrender
        each such option to the Corporation. In return for the surrendered
        option, the Optionee shall receive a cash distribution from the
        Corporation in an amount equal to the excess of (A) the Take-Over Price
        of the shares of Common Stock at the time subject to such option
        (whether or not the option is otherwise at that time exercisable for
        those shares) over (B) the aggregate exercise price payable for those
        shares. Such cash distribution shall be paid within five (5) days
        following the option surrender date.

                             (iii) At the time such limited stock appreciation
        right is granted, the Plan Administrator shall pre-approve any
        subsequent exercise of that right in accordance with the terms of this
        Paragraph C. Accordingly, no further approval of the Plan Administrator
        or the Board shall be required at the time of the actual option
        surrender and cash distribution.

                                       12
<PAGE>   13
                                  ARTICLE THREE
                     SALARY INVESTMENT OPTION GRANT PROGRAM

        I.     OPTION GRANTS

               The Primary Committee shall have the sole and exclusive authority
to determine the calendar year or years (if any) for which the Salary Investment
Option Grant Program is to be in effect and to select the Section 16 Insiders
and other highly compensated Employees eligible to participate in the Salary
Investment Option Grant Program for such calendar year or years. Each selected
individual who elects to participate in the Salary Investment Option Grant
Program must, prior to the start of each calendar year of participation, file
with the Plan Administrator (or its designate) an irrevocable authorization
directing the Corporation to reduce his or her base salary for that calendar
year by an amount not less than Ten Thousand Dollars ($10,000.00) nor more than
Fifty Thousand Dollars ($50,000.00). Each individual who files such a timely
authorization shall automatically be granted an option under the Salary
Investment Grant Program on the first trading day in January of the calendar
year for which the salary reduction is to be in effect.

        II.    OPTION TERMS

               Each option shall be a Non-Statutory Option evidenced by one or
more documents in the form approved by the Plan Administrator; provided,
however, that each such document shall comply with the terms specified below.

               A.     EXERCISE PRICE.

                      1. The exercise price per share shall be thirty-three and
one-third percent (33-1/3%) of the Fair Market Value per share of Common Stock
on the option grant date.

                      2. The exercise price shall become immediately due upon
exercise of the option and shall be payable in one or more of the alternative
forms authorized under the Discretionary Option Grant Program. Except to the
extent the sale and remittance procedure specified thereunder is utilized,
payment of the exercise price for the purchased shares must be made on the
Exercise Date.

               B. NUMBER OF OPTION SHARES. The number of shares of Common Stock
subject to the option shall be determined pursuant to the following formula
(rounded down to the nearest whole number):

                      X = A / (B x 66-2/3%), where

                      X is the number of option shares,

                                       13

<PAGE>   14

                      A is the dollar amount by which the Optionee's base salary
               is to be reduced for the calendar year pursuant to his or her
               election under the Salary Investment Option Grant Program, and

                      B is the Fair Market Value per share of Common Stock on
               the option grant date.

               C. EXERCISE AND TERM OF OPTIONS. The option shall become
exercisable in a series of twelve (12) successive equal monthly installments
upon the Optionee's completion of each calendar month of Service in the calendar
year for which the salary reduction is in effect. Each option shall have a
maximum term of ten (10) years measured from the option grant date.

               D. EFFECT OF TERMINATION OF SERVICE. Should the Optionee cease
Service for any reason while holding one or more options under this Article
Three, then each such option shall remain exercisable, for any or all of the
shares for which the option is exercisable at the time of such cessation of
Service, until the earlier of (i) the expiration of the ten (10)-year option
term or (ii) the expiration of the three (3)-year period measured from the date
of such cessation of Service. Should the Optionee die while holding one or more
options under this Article Three, then each such option may be exercised, for
any or all of the shares for which the option is exercisable at the time of the
Optionee's cessation of Service (less any shares subsequently purchased by
Optionee prior to death), by the personal representative of the Optionee's
estate or by the person or persons to whom the option is transferred pursuant to
the Optionee's will or the laws of inheritance or by the designated beneficiary
or beneficiaries of the option. Such right of exercise shall lapse, and the
option shall terminate, upon the earlier of (i) the expiration of the ten
(10)-year option term or (ii) the three (3)-year period measured from the date
of the Optionee's cessation of Service. However, the option shall, immediately
upon the Optionee's cessation of Service for any reason, terminate and cease to
remain outstanding with respect to any and all shares of Common Stock for which
the option is not otherwise at that time exercisable.

        III.   CORPORATE TRANSACTION/ CHANGE IN CONTROL/ HOSTILE TAKE-OVER

               A. In the event of any Corporate Transaction while the Optionee
remains in Service, each outstanding option held by such Optionee under this
Salary Investment Option Grant Program shall automatically accelerate so that
each such option shall, immediately prior to the effective date of the Corporate
Transaction, become exercisable for all the shares of Common Stock at the time
subject to such option and may be exercised for any or all of those shares as
fully vested shares of Common Stock. Each such outstanding option shall
terminate immediately following the Corporate Transaction, except to the extent
assumed by the successor corporation (or parent thereof) in such Corporate
Transaction. Any option so assumed and shall remain exercisable for the fully
vested shares until the earlier of (i) the expiration of the ten (10)-year
option term or (ii) the expiration of the three (3)-year period measured from
the date of the Optionee's cessation of Service.

                                       14

<PAGE>   15
               B. In the event of a Change in Control while the Optionee remains
in Service, each outstanding option held by such Optionee under this Salary
Investment Option Grant Program shall automatically accelerate so that each such
option shall, immediately prior to the effective date of the Change in Control,
become exercisable for all the shares of Common Stock at the time subject to
such option and may be exercised for any or all of those shares as fully vested
shares of Common Stock. The option shall remain so exercisable until the
earliest to occur of (i) the expiration of the ten (10)-year option term, (ii)
the expiration of the three (3)-year period measured from the date of the
Optionee's cessation of Service, (iii) the termination of the option in
connection with a Corporate Transaction or (iv) the surrender of the option in
connection with a Hostile Take-Over.

               C. Upon the occurrence of a Hostile Take-Over, the Optionee shall
have a thirty (30)-day period in which to surrender to the Corporation each
outstanding option granted him or her under the Salary Investment Option Grant
Program. The Optionee shall in return be entitled to a cash distribution from
the Corporation in an amount equal to the excess of (i) the Take-Over Price of
the shares of Common Stock at the time subject to the surrendered option
(whether or not the option is otherwise at the time exercisable for those
shares) over (ii) the aggregate exercise price payable for such shares. Such
cash distribution shall be paid within five (5) days following the surrender of
the option to the Corporation. The Primary Committee shall, at the time the
option with such limited stock appreciation right is granted under the Salary
Investment Option Grant Program, pre-approve any subsequent exercise of that
right in accordance with the terms of this Paragraph C. Accordingly, no further
approval of the Primary Committee or the Board shall be required at the time of
the actual option surrender and cash distribution.

               D. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments shall also be made to the exercise price payable per
share under each outstanding option, provided the aggregate exercise price
payable for such securities shall remain the same. To the extent the actual
holders of the Corporation's outstanding Common Stock receive cash consideration
for their Common Stock in consummation of the Corporate Transaction, the
successor corporation may, in connection with the assumption of the outstanding
options under the Salary Investment Option Grant Program, substitute one or more
shares of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

               E. The grant of options under the Salary Investment Option Grant
Program shall in no way affect the right of the Corporation to adjust,
reclassify, reorganize or otherwise change its capital or business structure or
to merge, consolidate, dissolve, liquidate or sell or transfer all or any part
of its business or assets.

                                       15
<PAGE>   16
        IV.    REMAINING TERMS

               The remaining terms of each option granted under the Salary
Investment Option Grant Program shall be the same as the terms in effect for
option grants made under the Discretionary Option Grant Program.

                                       16
<PAGE>   17
                                  ARTICLE FOUR
                             STOCK ISSUANCE PROGRAM

        I.     STOCK ISSUANCE TERMS

               Shares of Common Stock may be issued under the Stock Issuance
Program through direct and immediate issuances without any intervening option
grants. Each such stock issuance shall be evidenced by a Stock Issuance
Agreement which complies with the terms specified below. Shares of Common Stock
may also be issued under the Stock Issuance Program pursuant to share right
awards which entitle the recipients to receive those shares upon the attainment
of designated performance goals.

               A.     PURCHASE PRICE.

                      1. The purchase price per share shall be fixed by the Plan
Administrator, but shall not be less than one hundred percent (100%) of the Fair
Market Value per share of Common Stock on the issuance date.

                      2. Subject to the provisions of Section I of Article
Seven, shares of Common Stock may be issued under the Stock Issuance Program for
any of the following items of consideration which the Plan Administrator may
deem appropriate in each individual instance:

                             (i) cash or check made payable to the Corporation,
        or

                             (ii) past services rendered to the Corporation (or
        any Parent or Subsidiary).

               B.     VESTING PROVISIONS.

                      1. Shares of Common Stock issued under the Stock Issuance
Program may, in the discretion of the Plan Administrator, be fully and
immediately vested upon issuance or may vest in one or more installments over
the Participant's period of Service or upon attainment of specified performance
objectives. The elements of the vesting schedule applicable to any unvested
shares of Common Stock issued under the Stock Issuance Program shall be
determined by the Plan Administrator and incorporated into the Stock Issuance
Agreement. Shares of Common Stock may also be issued under the Stock Issuance
Program pursuant to share right awards which entitle the recipients to receive
those shares upon the attainment of designated performance goals.

                      2. Any new, substituted or additional securities or other
property (including money paid other than as a regular cash dividend) which the
Participant may have the right to receive with respect to the Participant's
unvested shares of Common Stock by reason of any stock dividend, stock split,
recapitalization, combination of shares, exchange of shares or

                                       17
<PAGE>   18
other change affecting the outstanding Common Stock as a class without the
Corporation's receipt of consideration shall be issued subject to (i) the same
vesting requirements applicable to the Participant's unvested shares of Common
Stock and (ii) such escrow arrangements as the Plan Administrator shall deem
appropriate.

                      3. The Participant shall have full stockholder rights with
respect to any shares of Common Stock issued to the Participant under the Stock
Issuance Program, whether or not the Participant's interest in those shares is
vested. Accordingly, the Participant shall have the right to vote such shares
and to receive any regular cash dividends paid on such shares.

                      4. Should the Participant cease to remain in Service while
holding one or more unvested shares of Common Stock issued under the Stock
Issuance Program or should the performance objectives not be attained with
respect to one or more such unvested shares of Common Stock, then those shares
shall be immediately surrendered to the Corporation for cancellation, and the
Participant shall have no further stockholder rights with respect to those
shares. To the extent the surrendered shares were previously issued to the
Participant for consideration paid in cash or cash equivalent (including the
Participant's purchase-money indebtedness), the Corporation shall repay to the
Participant the cash consideration paid for the surrendered shares and shall
cancel the unpaid principal balance of any outstanding purchase-money note of
the Participant attributable to the surrendered shares.

                      5. The Plan Administrator may in its discretion waive the
surrender and cancellation of one or more unvested shares of Common Stock which
would otherwise occur upon the cessation of the Participant's Service or the
non-attainment of the performance objectives applicable to those shares. Such
waiver shall result in the immediate vesting of the Participant's interest in
the shares of Common Stock as to which the waiver applies. Such waiver may be
effected at any time, whether before or after the Participant's cessation of
Service or the attainment or non-attainment of the applicable performance
objectives.

                      6. Outstanding share right awards under the Stock Issuance
Program shall automatically terminate, and no shares of Common Stock shall
actually be issued in satisfaction of those awards, if the performance goals
established for such awards are not attained. The Plan Administrator, however,
shall have the discretionary authority to issue shares of Common Stock under one
or more outstanding share right awards as to which the designated performance
goals have not been attained.

        II.    CORPORATE TRANSACTION/CHANGE IN CONTROL

               A. All of the Corporation's outstanding repurchase rights under
the Stock Issuance Program shall terminate automatically, and all the shares of
Common Stock subject to those terminated rights shall immediately vest in full,
in the event of any Corporate Transaction, except to the extent (i) those
repurchase rights are to be assigned to the successor corporation (or parent
thereof) in connection with such Corporate Transaction or (ii) such accelerated
vesting is precluded by other limitations imposed in the Stock Issuance
Agreement.

                                       18
<PAGE>   19

               B. The Plan Administrator shall have the discretionary authority
to structure one or more of the Corporation's repurchase rights under the Stock
Issuance Program so that those rights shall automatically terminate in whole or
in part, and the shares of Common Stock subject to those terminated rights shall
immediately vest, in the event the Participant's Service should subsequently
terminate by reason of an Involuntary Termination within a designated period
(not to exceed eighteen (18) months) following the effective date of any
Corporate Transaction in which those repurchase rights are assigned to the
successor corporation (or parent thereof).

               C. The Plan Administrator shall also have the discretionary
authority to structure one or more of the Corporation's repurchase rights under
the Stock Issuance Program so that those rights shall automatically terminate in
whole or in part, and the shares of Common Stock subject to those terminated
rights shall immediately vest, in the event the Participant's Service should
subsequently terminate by reason of an Involuntary Termination within a
designated period (not to exceed eighteen (18) months) following the effective
date of any Change in Control.

        III.   SHARE ESCROW/LEGENDS

        Unvested shares may, in the Plan Administrator's discretion, be held in
escrow by the Corporation until the Participant's interest in such shares vests
or may be issued directly to the Participant with restrictive legends on the
certificates evidencing those unvested shares.

                                       19
<PAGE>   20

                                  ARTICLE FIVE
                         AUTOMATIC OPTION GRANT PROGRAM

        I.     OPTION TERMS

               A. GRANT DATES. Option grants shall be made on the dates
specified below:

                      1. Each individual who is first elected or appointed as a
non-employee Board member at any time on or after the Underwriting Date shall
automatically be granted, on the date of such initial election or appointment, a
Non-Statutory Option to purchase 50,000 shares of Common Stock, provided that
individual has not previously been in the employ of the Corporation or any
Parent or Subsidiary.

                      2. On the date of each Annual Stockholders Meeting held
after the Underwriting Date, each individual who is to continue to serve as a
non-employee Board member, whether or not that individual is standing for
re-election to the Board at that particular Annual Meeting, shall automatically
be granted a Non-Statutory Option to purchase 10,000 shares of Common Stock,
provided such individual has served as a non-employee Board member for at least
six (6) months. There shall be no limit on the number of such 10,000-share
option grants any one non-employee Board member may receive over his or her
period of Board service, and non-employee Board members who have previously been
in the employ of the Corporation (or any Parent or Subsidiary) or who have
otherwise received one or more stock option grants from the Corporation prior to
the Underwriting Date shall be eligible to receive one or more such annual
option grants over their period of continued Board service.

               B. EXERCISE PRICE.

                      1. The exercise price per share shall be equal to one
hundred percent (100%) of the Fair Market Value per share of Common Stock on the
option grant date.

                      2. The exercise price shall be payable in one or more of
the alternative forms authorized under the Discretionary Option Grant Program.
Except to the extent the sale and remittance procedure specified thereunder is
utilized, payment of the exercise price for the purchased shares must be made on
the Exercise Date.

               C. OPTION TERM. Each option shall have a term of ten (10) years
measured from the option grant date.

               D. EXERCISE AND VESTING OF OPTIONS. Each option shall be
immediately exercisable for any or all of the option shares. However, any
unvested shares purchased under the option shall be subject to repurchase by the
Corporation, at the exercise price paid per share, upon the Optionee's cessation
of Board service prior to vesting in those shares. The shares subject to each
initial 50,000-share grant shall vest, and the Corporation's repurchase right
shall

                                       20
<PAGE>   21
lapse, in a series of thirty-six (36) successive equal monthly installments upon
the Optionee's completion of each month of service as a Board member over the
thirty-six (36)-month period measured from the option grant date. The shares
subject to each annual 10,000-share option grant shall vest in a series of
twelve (12) successive equal monthly installments upon the Optionee's completion
of each month of service as a Board member over the twelve (12)-month month
period measured from the grant date.

               E. LIMITED TRANSFERABILITY OF OPTIONS. Each option under this
Article Five may be assigned in whole or in part during the Optionee's lifetime
to one or more members of the Optionee's family or to a trust established
exclusively for one or more such family members or to Optionee's former spouse,
to the extent such assignment is in connection with the Optionee's estate plan
or pursuant to a domestic relations order. The assigned portion may only be
exercised by the person or persons who acquire a proprietary interest in the
option pursuant to the assignment. The terms applicable to the assigned portion
shall be the same as those in effect for the option immediately prior to such
assignment and shall be set forth in such documents issued to the assignee as
the Plan Administrator may deem appropriate. The Optionee may also designate one
or more persons as the beneficiary or beneficiaries of his or her outstanding
options under this Article Five, and those options shall, in accordance with
such designation, automatically be transferred to such beneficiary or
beneficiaries upon the Optionee's death while holding those options. Such
beneficiary or beneficiaries shall take the transferred options subject to all
the terms and conditions of the applicable agreement evidencing each such
transferred option, including (without limitation) the limited time period
during which the option may be exercised following the Optionee's death.

               F. TERMINATION OF BOARD SERVICE. The following provisions shall
govern the exercise of any options held by the Optionee at the time the Optionee
ceases to serve as a Board member:

                             (i) The Optionee (or, in the event of Optionee's
        death, the personal representative of the Optionee's estate or the
        person or persons to whom the option is transferred pursuant to the
        Optionee's will or the laws of inheritance or the designated beneficiary
        or beneficiaries of such option) shall have a twelve (12)-month period
        following the date of such cessation of Board service in which to
        exercise each such option.

                             (ii) During the twelve (12)-month exercise period,
        the option may not be exercised in the aggregate for more than the
        number of vested shares of Common Stock for which the option is
        exercisable at the time of the Optionee's cessation of Board service.

                             (iii) Should the Optionee cease to serve as a Board
        member by reason of death or Permanent Disability, then all shares at
        the time subject to the option shall immediately vest so that such
        option may, during the twelve (12)-month exercise period following such
        cessation of Board service, be exercised for all or any portion of those
        shares as fully vested shares of Common Stock.

                                       21
<PAGE>   22

                             (iv) In no event shall the option remain
        exercisable after the expiration of the option term. Upon the expiration
        of the twelve (12)-month exercise period or (if earlier) upon the
        expiration of the option term, the option shall terminate and cease to
        be outstanding for any vested shares for which the option has not been
        exercised. However, the option shall, immediately upon the Optionee's
        cessation of Board service for any reason other than death or Permanent
        Disability, terminate and cease to be outstanding to the extent the
        option is not otherwise at that time exercisable for vested shares.

        II.    CORPORATE TRANSACTION/ CHANGE IN CONTROL/ HOSTILE TAKE-OVER

               A. In the event of any Corporate Transaction while the Optionee
remains a Board member, the shares of Common Stock at the time subject to each
outstanding option under this Automatic Option Grant Program but not otherwise
vested shall automatically vest in full so that each such option shall,
immediately prior to the effective date of the Corporate Transaction, become
exercisable for all the option shares as fully vested shares of Common Stock and
may be exercised for any or all of those vested shares. Immediately following
the consummation of the Corporate Transaction, each automatic option grant shall
terminate and cease to be outstanding, except to the extent assumed by the
successor corporation (or parent thereof).

               B. In connection with any Change in Control while the Optionee
remains a Board member, the shares of Common Stock at the time subject to each
outstanding option under this Automatic Option Grant Program but not otherwise
vested shall automatically vest in full so that each such option shall,
immediately prior to the effective date of the Change in Control, become
exercisable for all the option shares as fully vested shares of Common Stock and
may be exercised for any or all of those vested shares. Each such option shall
remain exercisable for such fully vested option shares until the expiration or
sooner termination of the option term or the surrender of the option in
connection with a Hostile Take-Over.

               C. All outstanding repurchase rights under this Automatic Option
Grant Program shall automatically terminate, and the shares of Common Stock
subject to those terminated rights shall immediately vest in full, in the event
of any Corporate Transaction or Change in Control.

               D. Upon the occurrence of a Hostile Take-Over, the Optionee shall
have a thirty (30)-day period in which to surrender to the Corporation each of
his or her outstanding options under this Automatic Option Grant Program. The
Optionee shall in return be entitled to a cash distribution from the Corporation
in an amount equal to the excess of (i) the Take-Over Price of the shares of
Common Stock at the time subject to each surrendered option (whether or not the
Optionee is otherwise at the time vested in those shares) over (ii) the
aggregate exercise price payable for such shares. Such cash distribution shall
be paid within five (5) days following the surrender of the option to the
Corporation. No approval or consent of the Board or any Plan Administrator shall
be required at the time of the actual option surrender and cash distribution.

                                       22

<PAGE>   23

<PAGE>   24
               E. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments shall also be made to the exercise price payable per
share under each outstanding option, provided the aggregate exercise price
payable for such securities shall remain the same. To the extent the actual
holders of the Corporation's outstanding Common Stock receive cash consideration
for their Common Stock in consummation of the Corporate Transaction, the
successor corporation may, in connection with the assumption of the outstanding
options under the Automatic Option Grant Program, substitute one or more shares
of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

               F. The grant of options under the Automatic Option Grant Program
shall in no way affect the right of the Corporation to adjust, reclassify,
reorganize or otherwise change its capital or business structure or to merge,
consolidate, dissolve, liquidate or sell or transfer all or any part of its
business or assets.

        III.   REMAINING TERMS

               The remaining terms of each option granted under the Automatic
Option Grant Program shall be the same as the terms in effect for option grants
made under the Discretionary Option Grant Program.

                                       23
<PAGE>   25

                                   ARTICLE SIX
                        DIRECTOR FEE OPTION GRANT PROGRAM

        I.     OPTION GRANTS

               The Primary Committee shall have the sole and exclusive authority
to determine the calendar year or years for which the Director Fee Option Grant
Program is to be in effect. For each such calendar year the program is in
effect, each non-employee Board member may irrevocably elect to apply all or any
portion of the annual retainer fee otherwise payable in cash for his or her
service on the Board for that year to the acquisition of a special option grant
under this Director Fee Option Grant Program. Such election must be filed with
the Corporation's Chief Financial Officer prior to the first day of the calendar
year for which the annual retainer fee which is the subject of that election is
otherwise payable. Each non-employee Board member who files such a timely
election shall automatically be granted an option under this Director Fee Option
Grant Program on the first trading day in January in the calendar year for which
the annual retainer fee which is the subject of that election would otherwise be
payable in cash.

        II.    OPTION TERMS

               Each option shall be a Non-Statutory Option governed by the terms
and conditions specified below.

               A.     EXERCISE PRICE.

                      1. The exercise price per share shall be thirty-three and
one-third percent (33-1/3%) of the Fair Market Value per share of Common Stock
on the option grant date.

                      2. The exercise price shall become immediately due upon
exercise of the option and shall be payable in one or more of the alternative
forms authorized under the Discretionary Option Grant Program. Except to the
extent the sale and remittance procedure specified thereunder is utilized,
payment of the exercise price for the purchased shares must be made on the
Exercise Date.

               B. NUMBER OF OPTION SHARES. The number of shares of Common Stock
subject to the option shall be determined pursuant to the following formula
(rounded down to the nearest whole number):

                      X = A divided by (B x 66-2/3%), where

                      X is the number of option shares,

                      A is the portion of the annual retainer fee subject to the
               non-employee Board member's election under this Director Fee
               Option Grant Program, and

                                       24
<PAGE>   26

                      B is the Fair Market Value per share of Common Stock on
               the option grant date.

               C. EXERCISE AND TERM OF OPTIONS. The option shall become
exercisable in a series of twelve (12) equal monthly installments upon the
Optionee's completion of each calendar month of Board service during the
calendar year for which the retainer fee election is in effect. Each option
shall have a maximum term of ten (10) years measured from the option grant date.

               D. LIMITED TRANSFERABILITY OF OPTIONS. Each option under this
Article Six may be assigned in whole or in part during the Optionee's lifetime
to one or more members of the Optionee's family or to a trust established
exclusively for one or more such family members or to Optionee's former spouse,
to the extent such assignment is in connection with Optionee's estate plan or
pursuant to a domestic relations order. The assigned portion may only be
exercised by the person or persons who acquire a proprietary interest in the
option pursuant to the assignment. The terms applicable to the assigned portion
shall be the same as those in effect for the option immediately prior to such
assignment and shall be set forth in such documents issued to the assignee as
the Plan Administrator may deem appropriate. The Optionee may also designate one
or more persons as the beneficiary or beneficiaries of his or her outstanding
options under this Article Six, and those options shall, in accordance with such
designation, automatically be transferred to such beneficiary or beneficiaries
upon the Optionee's death while holding those options. Such beneficiary or
beneficiaries shall take the transferred options subject to all the terms and
conditions of the applicable agreement evidencing each such transferred option,
including (without limitation) the limited time period during which the option
may be exercised following the Optionee's death.

               E. TERMINATION OF BOARD SERVICE. Should the Optionee cease Board
service for any reason (other than death or Permanent Disability) while holding
one or more options under this Director Fee Option Grant Program, then each such
option shall remain exercisable, for any or all of the shares for which the
option is exercisable at the time of such cessation of Board service, until the
earlier of (i) the expiration of the ten (10)-year option term or (ii) the
expiration of the three (3)-year period measured from the date of such cessation
of Board service. However, each option held by the Optionee under this Director
Fee Option Grant Program at the time of his or her cessation of Board service
shall immediately terminate and cease to remain outstanding with respect to any
and all shares of Common Stock for which the option is not otherwise at that
time exercisable.

               F. DEATH OR PERMANENT DISABILITY. Should the Optionee's service
as a Board member cease by reason of death or Permanent Disability, then each
option held by such Optionee under this Director Fee Option Grant Program shall
immediately become exercisable for all the shares of Common Stock at the time
subject to that option, and the option may be exercised for any or all of those
shares as fully vested shares until the earlier of (i) the expiration of the ten
(10)-year option term or (ii) the expiration of the three (3)-year period
measured from

                                       25
<PAGE>   27
the date of such cessation of Board service. To the extent such option is held
by the Optionee at the time of his or her death, that option may be exercised by
the personal representative of the Optionee's estate or by the person or persons
to whom the option is transferred pursuant to the Optionee's will or the laws of
inheritance or by the designated beneficiary or beneficiaries of such option.

                      Should the Optionee die after cessation of Board service
but while holding one or more options under this Director Fee Option Grant
Program, then each such option may be exercised, for any or all of the shares
for which the option is exercisable at the time of the Optionee's cessation of
Board service (less any shares subsequently purchased by Optionee prior to
death), by the personal representative of the Optionee's estate or by the person
or persons to whom the option is transferred pursuant to the Optionee's will or
the laws of inheritance or by the designated beneficiary or beneficiaries of
such option. Such right of exercise shall lapse, and the option shall terminate,
upon the earlier of (i) the expiration of the ten (10)-year option term or (ii)
the three (3)-year period measured from the date of the Optionee's cessation of
Board service.

        III.   CORPORATE TRANSACTION/CHANGE IN CONTROL/HOSTILE TAKE-OVER

               A. In the event of any Corporate Transaction while the Optionee
remains a Board member, each outstanding option held by such Optionee under this
Director Fee Option Grant Program shall automatically accelerate so that each
such option shall, immediately prior to the effective date of the Corporate
Transaction, become exercisable for all the shares of Common Stock at the time
subject to such option and may be exercised for any or all of those shares as
fully vested shares of Common Stock. Each such outstanding option shall
terminate immediately following the Corporate Transaction, except to the extent
assumed by the successor corporation (or parent thereof) in such Corporate
Transaction. Any option so assumed and shall remain exercisable for the fully
vested shares until the earlier of (i) the expiration of the ten (10)-year
option term or (ii) the expiration of the three (3)-year period measured from
the date of the Optionee's cessation of Board service.

               B. In the event of a Change in Control while the Optionee remains
in Service, each outstanding option held by such Optionee under this Director
Fee Option Grant Program shall automatically accelerate so that each such option
shall, immediately prior to the effective date of the Change in Control, become
exercisable for all the shares of Common Stock at the time subject to such
option and may be exercised for any or all of those shares as fully vested
shares of Common Stock. The option shall remain so exercisable until the
earliest to occur of (i) the expiration of the ten (10)-year option term, (ii)
the expiration of the three (3)-year period measured from the date of the
Optionee's cessation of Board service, (iii) the termination of the option in
connection with a Corporate Transaction or (iv) the surrender of the option in
connection with a Hostile Take-Over.

               C. Upon the occurrence of a Hostile Take-Over, the Optionee shall
have a thirty (30)-day period in which to surrender to the Corporation each
outstanding option granted him or her under the Director Fee Option Grant
Program. The Optionee shall in return be

                                       26
<PAGE>   28
entitled to a cash distribution from the Corporation in an amount equal to the
excess of (i) the Take-Over Price of the shares of Common Stock at the time
subject to each surrendered option (whether or not the option is otherwise at
the time exercisable for those shares) over (ii) the aggregate exercise price
payable for such shares. Such cash distribution shall be paid within five (5)
days following the surrender of the option to the Corporation. No approval or
consent of the Board or any Plan Administrator shall be required at the time of
the actual option surrender and cash distribution.

               D. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments shall also be made to the exercise price payable per
share under each outstanding option, provided the aggregate exercise price
payable for such securities shall remain the same. To the extent the actual
holders of the Corporation's outstanding Common Stock receive cash consideration
for their Common Stock in consummation of the Corporate Transaction, the
successor corporation may, in connection with the assumption of the outstanding
options under the Director Fee Option Grant Program, substitute one or more
shares of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

               E. The grant of options under the Director Fee Option Grant
Program shall in no way affect the right of the Corporation to adjust,
reclassify, reorganize or otherwise change its capital or business structure or
to merge, consolidate, dissolve, liquidate or sell or transfer all or any part
of its business or assets.

        IV.    REMAINING TERMS

               The remaining terms of each option granted under this Director
Fee Option Grant Program shall be the same as the terms in effect for option
grants made under the Discretionary Option Grant Program.

                                       27
<PAGE>   29

                                  ARTICLE SEVEN
                                  MISCELLANEOUS

        I.     FINANCING

               The Plan Administrator may permit any Optionee or Participant to
pay the option exercise price under the Discretionary Option Grant Program or
the purchase price of shares issued under the Stock Issuance Program by
delivering a full-recourse, interest-bearing promissory note payable in one or
more installments. The terms of any such promissory note (including the interest
rate and the terms of repayment) shall be established by the Plan Administrator
in its sole discretion. In no event may the maximum credit available to the
Optionee or Participant exceed the sum of (i) the aggregate option exercise
price or purchase price payable for the purchased shares (less the par value of
such shares) plus (ii) any Federal, state and local income and employment tax
liability incurred by the Optionee or the Participant in connection with the
option exercise or share purchase.

        II.    TAX WITHHOLDING

               A. The Corporation's obligation to deliver shares of Common Stock
upon the exercise of options or the issuance or vesting of such shares under the
Plan shall be subject to the satisfaction of all applicable Federal, state and
local income and employment tax withholding requirements.

               B. The Plan Administrator may, in its discretion, provide any or
all holders of Non-Statutory Options or unvested shares of Common Stock under
the Plan (other than the options granted or the shares issued under the
Automatic Option Grant or Director Fee Option Grant Program) with the right to
use shares of Common Stock in satisfaction of all or part of the Withholding
Taxes to which such holders may become subject in connection with the exercise
of their options or the vesting of their shares. Such right may be provided to
any such holder in either or both of the following formats:

                      Stock Withholding: The election to have the Corporation
withhold, from the shares of Common Stock otherwise issuable upon the exercise
of such Non-Statutory Option or the vesting of such shares, a portion of those
shares with an aggregate Fair Market Value equal to the percentage of the
Withholding Taxes (not to exceed one hundred percent (100%)) designated by the
holder.

                      Stock Delivery: The election to deliver to the
Corporation, at the time the Non-Statutory Option is exercised or the shares
vest, one or more shares of Common Stock previously acquired by such holder
(other than in connection with the option exercise or share vesting triggering
the Withholding Taxes) with an aggregate Fair Market Value equal to the
percentage of the Withholding Taxes (not to exceed one hundred percent (100%))
designated by the holder.

                                       28
<PAGE>   30

        III.   EFFECTIVE DATE AND TERM OF THE PLAN

               A. The Plan shall become effective immediately on the Plan
Effective Date. However, the Salary Investment Option Grant Program and the
Director Fee Option Grant Program shall not be implemented until such time as
the Primary Committee may deem appropriate. Options may be granted under the
Discretionary Option Grant at any time on or after the Plan Effective Date, and
the initial option grants under the Automatic Option Grant Program shall also be
made on the Plan Effective Date to any non-employee Board members eligible for
such grants at that time. However, no options granted under the Plan may be
exercised, and no shares shall be issued under the Plan, until the Plan is
approved by the Corporation's stockholders. If such stockholder approval is not
obtained within twelve (12) months after the Plan Effective Date, then all
options previously granted under this Plan shall terminate and cease to be
outstanding, and no further options shall be granted and no shares shall be
issued under the Plan.

               B. The Plan shall serve as the successor to the Predecessor Plan,
and no further option grants or direct stock issuances shall be made under the
Predecessor Plan after the Plan Effective Date. All options outstanding under
the Predecessor Plan on the Plan Effective Date shall be incorporated into the
Plan at that time and shall be treated as outstanding options under the Plan.
However, each outstanding option so incorporated shall continue to be governed
solely by the terms of the documents evidencing such option, and no provision of
the Plan shall be deemed to affect or otherwise modify the rights or obligations
of the holders of such incorporated options with respect to their acquisition of
shares of Common Stock.

               C. One or more provisions of the Plan, including (without
limitation) the option/vesting acceleration provisions of Article Two relating
to Corporate Transactions and Changes in Control, may, in the Plan
Administrator's discretion, be extended to one or more options incorporated from
the Predecessor Plan which do not otherwise contain such provisions.

               D. The Plan shall terminate upon the earliest to occur of (i)
February 7, 2010, (ii) the date on which all shares available for issuance under
the Plan shall have been issued as fully vested shares or (iii) the termination
of all outstanding options in connection with a Corporate Transaction. Should
the Plan terminate on February 7, 2010, then all option grants and unvested
stock issuances outstanding at that time shall continue to have force and effect
in accordance with the provisions of the documents evidencing such grants or
issuances.

        IV.    AMENDMENT OF THE PLAN

               A. The Board shall have complete and exclusive power and
authority to amend or modify the Plan in any or all respects. However, no such
amendment or modification shall adversely affect the rights and obligations with
respect to stock options or unvested stock issuances at the time outstanding
under the Plan unless the Optionee or the Participant consents to such amendment
or modification. In addition, certain amendments may require stockholder
approval pursuant to applicable laws or regulations.

                                       29
<PAGE>   31
               B. Options to purchase shares of Common Stock may be granted
under the Discretionary Option Grant and Salary Investment Option Grant Programs
and shares of Common Stock may be issued under the Stock Issuance Program that
are in each instance in excess of the number of shares then available for
issuance under the Plan, provided any excess shares actually issued under those
programs shall be held in escrow until there is obtained stockholder approval of
an amendment sufficiently increasing the number of shares of Common Stock
available for issuance under the Plan. If such stockholder approval is not
obtained within twelve (12) months after the date the first such excess
issuances are made, then (i) any unexercised options granted on the basis of
such excess shares shall terminate and cease to be outstanding and (ii) the
Corporation shall promptly refund to the Optionees and the Participants the
exercise or purchase price paid for any excess shares issued under the Plan and
held in escrow, together with interest (at the applicable Short Term Federal
Rate) for the period the shares were held in escrow, and such shares shall
thereupon be automatically cancelled and cease to be outstanding.

        V.     USE OF PROCEEDS

               Any cash proceeds received by the Corporation from the sale of
shares of Common Stock under the Plan shall be used for general corporate
purposes.

        VI.    REGULATORY APPROVALS

               A. The implementation of the Plan, the granting of any stock
option under the Plan and the issuance of any shares of Common Stock (i) upon
the exercise of any granted option or (ii) under the Stock Issuance Program
shall be subject to the Corporation's procurement of all approvals and permits
required by regulatory authorities having jurisdiction over the Plan, the stock
options granted under it and the shares of Common Stock issued pursuant to it.

               B. No shares of Common Stock or other assets shall be issued or
delivered under the Plan unless and until there shall have been compliance with
all applicable requirements of Federal and state securities laws, including the
filing and effectiveness of the Form S-8 registration statement for the shares
of Common Stock issuable under the Plan, and all applicable listing requirements
of any stock exchange (or the Nasdaq National Market, if applicable) on which
Common Stock is then listed for trading.

        VII.   NO EMPLOYMENT/SERVICE RIGHTS

               Nothing in the Plan shall confer upon the Optionee or the
Participant any right to continue in Service for any period of specific duration
or interfere with or otherwise restrict in any way the rights of the Corporation
(or any Parent or Subsidiary employing or retaining such person) or of the
Optionee or the Participant, which rights are hereby expressly reserved by each,
to terminate such person's Service at any time for any reason, with or without
cause.

                                       30
<PAGE>   32
                                    APPENDIX

               The following definitions shall be in effect under the Plan:

               A. AUTOMATIC OPTION GRANT PROGRAM shall mean the automatic option
grant program in effect under Article Five of the Plan.

               B. BOARD shall mean the Corporation's Board of Directors.

               C. CHANGE IN CONTROL shall mean a change in ownership or control
of the Corporation effected through either of the following transactions:

                             (i) the acquisition, directly or indirectly by any
        person or related group of persons (other than the Corporation or a
        person that directly or indirectly controls, is controlled by, or is
        under common control with, the Corporation), of beneficial ownership
        (within the meaning of Rule 13d-3 of the 1934 Act) of securities
        possessing more than fifty percent (50%) of the total combined voting
        power of the Corporation's outstanding securities pursuant to a tender
        or exchange offer made directly to the Corporation's stockholders, or

                             (ii) a change in the composition of the Board over
        a period of thirty-six (36) consecutive months or less such that a
        majority of the Board members ceases, by reason of one or more contested
        elections for Board membership, to be comprised of individuals who
        either (A) have been Board members continuously since the beginning of
        such period or (B) have been elected or nominated for election as Board
        members during such period by at least a majority of the Board members
        described in clause (A) who were still in office at the time the Board
        approved such election or nomination.

               D. CODE shall mean the Internal Revenue Code of 1986, as amended.

               E. COMMON STOCK shall mean the Corporation's common stock.

               F. CORPORATE TRANSACTION shall mean either of the following
stockholder-approved transactions to which the Corporation is a party:

                             (i) a merger or consolidation in which securities
        possessing more than fifty percent (50%) of the total combined voting
        power of the Corporation's outstanding securities are transferred to a
        person or persons different from the persons holding those securities
        immediately prior to such transaction, or

                             (ii) the sale, transfer or other disposition of all
        or substantially all of the Corporation's assets in complete liquidation
        or dissolution of the Corporation.

                                      A-1
<PAGE>   33
               G. CORPORATION shall mean Sangamo BioSciences, Inc., a Delaware
corporation, and any corporate successor to all or substantially all of the
assets or voting stock of Sangamo BioSciences, Inc. which shall by appropriate
action adopt the Plan.

               H. DIRECTOR FEE OPTION GRANT PROGRAM shall mean the special stock
option grant in effect for non-employee Board members under Article Six of the
Plan.

               I. DISCRETIONARY OPTION GRANT PROGRAM shall mean the
discretionary option grant program in effect under Article Two of the Plan.

               J. EMPLOYEE shall mean an individual who is in the employ of the
Corporation (or any Parent or Subsidiary), subject to the control and direction
of the employer entity as to both the work to be performed and the manner and
method of performance.

               K. EXERCISE DATE shall mean the date on which the Corporation
shall have received written notice of the option exercise.

               L. FAIR MARKET VALUE per share of Common Stock on any relevant
date shall be determined in accordance with the following provisions:

                             (i) If the Common Stock is at the time traded on
        the Nasdaq National Market, then the Fair Market Value shall be the
        closing selling price per share of Common Stock on the date in question,
        as such price is reported by the National Association of Securities
        Dealers on the Nasdaq National Market and published in The Wall Street
        Journal. If there is no closing selling price for the Common Stock on
        the date in question, then the Fair Market Value shall be the closing
        selling price on the last preceding date for which such quotation
        exists.

                             (ii) If the Common Stock is at the time listed on
        any Stock Exchange, then the Fair Market Value shall be the closing
        selling price per share of Common Stock on the date in question on the
        Stock Exchange determined by the Plan Administrator to be the primary
        market for the Common Stock, as such price is officially quoted in the
        composite tape of transactions on such exchange and published in The
        Wall Street Journal. If there is no closing selling price for the Common
        Stock on the date in question, then the Fair Market Value shall be the
        closing selling price on the last preceding date for which such
        quotation exists.

                             (iii) For purposes of any option grants made on the
        Underwriting Date, the Fair Market Value shall be deemed to be equal to
        the price per share at which the Common Stock is to be sold in the
        initial public offering pursuant to the Underwriting Agreement.

                                      A-2
<PAGE>   34
               M. HOSTILE TAKE-OVER shall mean the acquisition, directly or
indirectly, by any person or related group of persons (other than the
Corporation or a person that directly or indirectly controls, is controlled by,
or is under common control with, the Corporation) of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more
than fifty percent (50%) of the total combined voting power of the Corporation's
outstanding securities pursuant to a tender or exchange offer made directly to
the Corporation's stockholders which the Board does not recommend such
stockholders to accept.

               N. INCENTIVE OPTION shall mean an option which satisfies the
requirements of Code Section 422.

               O. INVOLUNTARY TERMINATION shall mean the termination of the
Service of any individual which occurs by reason of:

                             (i) such individual's involuntary dismissal or
        discharge by the Corporation for reasons other than Misconduct, or

                             (ii) such individual's voluntary resignation
        following (A) a change in his or her position with the Corporation which
        materially reduces his or her duties and responsibilities or the level
        of management to which he or she reports, (B) a reduction in his or her
        level of compensation (including base salary, fringe benefits and target
        bonus under any corporate-performance based bonus or incentive programs)
        by more than fifteen percent (15%) or (C) a relocation of such
        individual's place of employment by more than fifty (50) miles, provided
        and only if such change, reduction or relocation is effected by the
        Corporation without the individual's consent.

               P. MISCONDUCT shall mean the commission of any act of fraud,
embezzlement or dishonesty by the Optionee or Participant, any unauthorized use
or disclosure by such person of confidential information or trade secrets of the
Corporation (or any Parent or Subsidiary), or any other intentional misconduct
by such person adversely affecting the business or affairs of the Corporation
(or any Parent or Subsidiary) in a material manner. The foregoing definition
shall not be deemed to be inclusive of all the acts or omissions which the
Corporation (or any Parent or Subsidiary) may consider as grounds for the
dismissal or discharge of any Optionee, Participant or other person in the
Service of the Corporation (or any Parent or Subsidiary).

               Q. 1934 ACT shall mean the Securities Exchange Act of 1934, as
amended.

               R. NON-STATUTORY OPTION shall mean an option not intended to
satisfy the requirements of Code Section 422.

               S. OPTIONEE shall mean any person to whom an option is granted
under the Discretionary Option Grant, Salary Investment Option Grant, Automatic
Option Grant or Director Fee Option Grant Program.

                                      A-3
<PAGE>   35
               T. PARENT shall mean any corporation (other than the Corporation)
in an unbroken chain of corporations ending with the Corporation, provided each
corporation in the unbroken chain (other than the Corporation) owns, at the time
of the determination, stock possessing fifty percent (50%) or more of the total
combined voting power of all classes of stock in one of the other corporations
in such chain.

               U. PARTICIPANT shall mean any person who is issued shares of
Common Stock under the Stock Issuance Program.

               V. PERMANENT DISABILITY OR PERMANENTLY DISABLED shall mean the
inability of the Optionee or the Participant to engage in any substantial
gainful activity by reason of any medically determinable physical or mental
impairment expected to result in death or to be of continuous duration of twelve
(12) months or more. However, solely for purposes of the Automatic Option Grant
and Director Fee Option Grant Programs, Permanent Disability or Permanently
Disabled shall mean the inability of the non-employee Board member to perform
his or her usual duties as a Board member by reason of any medically
determinable physical or mental impairment expected to result in death or to be
of continuous duration of twelve (12) months or more.

               W. PLAN shall mean the Corporation's 2000 Stock Incentive Plan,
as set forth in this document.

               X. PLAN ADMINISTRATOR shall mean the particular entity, whether
the Primary Committee, the Board or the Secondary Committee, which is authorized
to administer the Discretionary Option Grant and Stock Issuance Programs with
respect to one or more classes of eligible persons, to the extent such entity is
carrying out its administrative functions under those programs with respect to
the persons under its jurisdiction.

               Y. PLAN EFFECTIVE DATE shall mean the date the Plan shall become
effective and shall be coincident with the Underwriting Date.

               Z. PREDECESSOR PLAN shall mean the Corporation's 1995 Stock
Option Plan in effect immediately prior to the Plan Effective Date hereunder.

               AA. PRIMARY COMMITTEE shall mean the committee of two (2) or more
non-employee Board members appointed by the Board to administer the
Discretionary Option Grant and Stock Issuance Programs with respect to Section
16 Insiders and to administer the Salary Investment Option Grant Program solely
with respect to the selection of the eligible individuals who may participate in
such program.

               BB. SALARY INVESTMENT OPTION GRANT PROGRAM shall mean the salary
investment option grant program in effect under Article Three of the Plan.

               CC. SECONDARY COMMITTEE shall mean a committee of one or more
Board members appointed by the Board to administer the Discretionary Option
Grant and Stock Issuance Programs with respect to eligible persons other than
Section 16 Insiders.

                                      A-4
<PAGE>   36

               DD. SECTION 16 INSIDER shall mean an officer or director of the
Corporation subject to the short-swing profit liabilities of Section 16 of the
1934 Act.

               EE. SERVICE shall mean the performance of services for the
Corporation (or any Parent or Subsidiary) by a person in the capacity of an
Employee, a non-employee member of the board of directors or a consultant or
independent advisor, except to the extent otherwise specifically provided in the
documents evidencing the option grant or stock issuance.

               FF. STOCK EXCHANGE shall mean either the American Stock Exchange
or the New York Stock Exchange.

               GG. STOCK ISSUANCE AGREEMENT shall mean the agreement entered
into by the Corporation and the Participant at the time of issuance of shares of
Common Stock under the Stock Issuance Program.

               HH. STOCK ISSUANCE PROGRAM shall mean the stock issuance program
in effect under Article Four of the Plan.

               II. SUBSIDIARY shall mean any corporation (other than the
Corporation) in an unbroken chain of corporations beginning with the
Corporation, provided each corporation (other than the last corporation) in the
unbroken chain owns, at the time of the determination, stock possessing fifty
percent (50%) or more of the total combined voting power of all classes of stock
in one of the other corporations in such chain.

               JJ. TAKE-OVER PRICE shall mean the greater of (i) the Fair Market
Value per share of Common Stock on the date the option is surrendered to the
Corporation in connection with a Hostile Take-Over or (ii) the highest reported
price per share of Common Stock paid by the tender offeror in effecting such
Hostile Take-Over. However, if the surrendered option is an Incentive Option,
the Take-Over Price shall not exceed the clause (i) price per share.

               KK. 10% STOCKHOLDER shall mean the owner of stock (as determined
under Code Section 424(d)) possessing more than ten percent (10%) of the total
combined voting power of all classes of stock of the Corporation (or any Parent
or Subsidiary).

               LL. UNDERWRITING AGREEMENT shall mean the agreement between the
Corporation and the underwriter or underwriters managing the initial public
offering of the Common Stock.

               MM. UNDERWRITING DATE shall mean the date on which the
Underwriting Agreement is executed and priced in connection with an initial
public offering of the Common Stock.

               NN. WITHHOLDING TAXES shall mean the Federal, state and local
income and employment withholding taxes to which the holder of Non-Statutory
Options or unvested shares of Common Stock may become subject in connection with
the exercise of those options or the vesting of those shares.

                                      A-5

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