Document:

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                     ASSIGNMENT OF WHOLESALE POWER CONTRACT

STATE OF TEXAS           )
                         )       KNOW ALL MEN BY THESE PRESENTS:
COUNTY OF ________       )

         This Assignment is made by Cap Rock Electric Cooperative, Inc. ("Cap
Rock"), accepted by New Corp Resources, Inc. ("NCR"), and consented to by
Southwestern Public Service Company ("SPS"), as of the 3rd day of March, 1995.

         Cap Rock, for and in consideration of ten dollars and other good and
valuable consideration, by means of this instrument, grants and conveys to
NCR, all legal and equitable rights, and benefits which it has or may have
pursuant to (i) that certain Wholesale Full Requirements Electric Power
Contract between Cap Rock and SPS, executed by Cap Rock and SPS on July 3,
1991, and amended on January 22, 1992 (the "Contract"), and (ii) that certain
Transmission Agreement between SPS and Cap Rock dated as of September 9,
1993, as amended by the First Amendment to Transaction Documents dated as of
June 24, 1994, the Second Amendment to Transaction Documents dated as of
November 9, 1994, and the Third Amendment to Transaction Documents dated as
of March 3, 1995 (the "Transmission Agreement").

         This Assignment is made subject to the following terms and
conditions:

         1. NO WARRANTY. Cap Rock makes this Assignment without any warranty,
expressed, implied, or statutory to NCR. Cap Rock expressly disclaims any
warranty and assigns to NCR only the

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legal and equitable rights, benefits, and interest as Cap Rock now has
pursuant to the Contract and/or the Transmission Agreement assigned.

         2. ASSUMPTION OF OBLIGATIONS. NCR agrees to promptly make all
payments due under the Contract and/or the Transmission Agreement and to
perform all obligations which arise pursuant to the Contract and/or the
Transmission Agreement. NCR further agrees to assume all obligations under
the Contract and/or the Transmission Agreement and to promptly pay or perform
all such obligations which arise under the Contract and/or the Transmission
Agreement.

         3. INDEMNITIES. NCR agrees to indemnify Cap Rock for any liability
to third parties arising out of or in connection with the Contract.

         4. GUARANTY. The Contract can be assigned only with the
non-assigning party's prior written consent. For and in consideration of
granting such consent by SPS, Cap Rock hereby agrees to guaranty all
obligations of NCR which arise pursuant to the Contract and/or the
Transmission Agreement and to be responsible for and guarantee all payments
or obligations which arise pursuant to the Contract and/or the Transmission
agreement if NCR defaults on its obligations thereunder. Cap Rock and NCR
hereby agree that neither the assignment of the contract and the Transmission
Agreement by Cap Rock nor the assumption of the Contract and the Transmission
Agreement by NCR shall relieve Cap Rock of its primary obligation to perform
under the terms and conditions of the Contract and the Transmission
Agreement.

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         5. BINDING AFFECT. This Assignment and all of its terms and
conditions are binding on and inure to the benefit of Cap Rock and its
successors and assigns, or NCR and its successors and assigns, and SPS and
its successors and assigns.

         SIGNED AND DELIVERED AS OF THE 3rd DAY OF MARCH, 1995.

                                       CAP ROCK ELECTRIC COOPERATIVE, INC.

                                       By: /s/ David W. Pruitt
                                          -----------------------------------
                                          David W. Pruitt, President/CEO

ATTEST:

/s/ Alfred Schwartz
----------------------------
Alfred Schwartz, Secretary

                                       NEW CORP RESOURCES, INC.

                                       By: /s/ Steven E. Collier
                                          -----------------------------------
                                          Steven E. Collier, President

ATTEST:

/s/ John D. Parker
-----------------------------
John D. Parker, Secretary

                                       SOUTHWESTERN PUBLIC SERVICE COMPANY

                                       By: /s/ Gary L. Gibson
                                          -----------------------------------
                                          Gary L. Gibson, Vice President,
                                            Marketing

ATTEST:

/s/ Mary Pullum
----------------------------------
         Assistant Secretary

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                              CONSENT TO ASSIGNMENT

         SPS hereby agrees to the Assignment of the Contract from Cap Rock to
New Corp.

                                    SOUTHWESTERN PUBLIC SERVICE COMPANY

                                    By: /s/ Gary L. Gibson
                                       ------------------------------------
                                       Gary L. Gibson, Vice President,
                                        Marketing

                                       4<PAGE>

                                                                    Exhibit 10.6

                              GILEAD SCIENCES, INC.
                             1991 STOCK OPTION PLAN

                            ADOPTED NOVEMBER 15, 1991
                              AMENDED APRIL 8, 1992
                             AMENDED APRIL 21, 1993
                            AMENDED OCTOBER 17, 1995
                      AMENDED AND RESTATED JANUARY 22, 1998
                             AMENDED MARCH 30, 1999
                       AMENDED AND RESTATED APRIL 5, 2000

                        TERMINATION DATE: APRIL 30, 2010

1.     PURPOSES.

       (a)    The Plan initially was adopted on November 15, 1991 and amended
through October 17, 1995 (the "Initial Plan"). The Initial Plan was amended and
restated in its entirety effective as of January 22, 1998 and amended through
March 30, 1999. Subject to the approval of stockholders of the Company, the Plan
hereby is amended and restated in its entirety, effective as of April 5, 2000.
The terms of the Plan (excluding the previously amended provision relating to
the exercise price of Nonstatutory Stock Options) shall apply to all options
granted pursuant to the Initial Plan.

       (b)    The purpose of the Plan is to provide a means by which selected
Employees and Directors of, and Consultants to, the Company and its Affiliates
may be given an opportunity to purchase stock of the Company.

       (c)    The Company, by means of the Plan, seeks to retain the services of
persons who are now Employees of or Consultants to the Company, to secure and
retain the services of new Employees and Consultants, and to provide incentives
for such persons to exert maximum efforts for the success of the Company.

       (d)    The Company intends that the Options issued under the Plan shall,
in the discretion of the Board or any Committee to which responsibility for
administration of the Plan has been delegated pursuant to subsection 3(c), be
either Incentive Stock Options or Nonstatutory Stock Options. All Options shall
be separately designated Incentive Stock Options or Nonstatutory Stock Options
at the time of grant, and in such form as issued pursuant to Section 6, and a
separate certificate or certificates will be issued for shares purchased on
exercise of each type of Option.

2.     DEFINITIONS.

       (a)    "AFFILIATE" means any parent corporation or subsidiary corporation
of the Company, whether now or hereafter existing, as those terms are defined in
Sections 424(e) and (f) respectively, of the Code.

       (b)    "BOARD" means the Board of Directors of the Company.

       (c)    "CODE" means the Internal Revenue Code of 1986, as amended.

       (d)    "COMMITTEE" means a Committee appointed by the Board in accordance
with subsection 3(c) of the Plan.

       (e)    "COMPANY" means Gilead Sciences, Inc., a Delaware corporation.

       (f)    "CONSULTANT" means any person, including an advisor, engaged by
the Company or an Affiliate to render services and who is compensated for such
services, provided that the term "Consultant" shall not include Directors who
are paid only a director's fee by the Company or who are not otherwise
compensated by the Company for their services as Directors. The term
"Consultant" shall include a member of the Board of Directors of an Affiliate.

       (g)    "CONTINUOUS SERVICE" (formerly designated as "CONTINUOUS STATUS AS
AN EMPLOYEE OR CONSULTANT") means that the Optionee's service with the Company
or its Affiliates is not interrupted or terminated. The Optionee's Continuous
Service shall not be deemed to have terminated merely because of a change in the
capacity in which the Optionee renders service to the Company or its

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Affiliates or a change in the entity for which the Optionee renders such
service, provided that there is no interruption or termination of the Optionee's
Continuous Service. For example, a change in status from an Employee of the
Company to a Consultant or Director of the Company or a member of the Board of
Directors of an Affiliate will not constitute an interruption of Continuous
Service. The Board or the chief executive officer of the Company, in that
party's sole discretion, may determine whether Continuous Service shall be
considered interrupted in the case of any leave of absence approved by the Board
or the chief executive officer of the Company, including sick leave, military
leave, or any other personal leave.

       (h)    "COVERED EMPLOYEE" means the chief executive officer and the four
(4) other highest compensated officers of the Company for whom total
compensation is required to be reported to shareholders under the Exchange Act,
as determined for purposes of Section 162(m) of the Code.

       (i)    "DIRECTOR" means a member of the Board.

       (j)    "DISABILITY" means total and permanent disability as defined in
Section 22(e)(3) of the Code.

       (k)    "EMPLOYEE" means any person, including Officers and Directors,
employed by the Company or any Affiliate of the Company. Neither service as a
Director nor payment of a director's fee by the Company shall be sufficient to
constitute "employment" by the Company.

       (l)    "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

       (m)    "FAIR MARKET VALUE" means, as of any date, the value of the common
stock of the Company determined as follows:

              (i)    If the common stock is listed on any established stock
       exchange or a national market system, including without limitation the
       National Market System of the National Association of Securities Dealers,
       Inc. Automated Quotation ("NASDAQ") System, the Fair Market Value of a
       share of common stock shall be the closing sales price for such stock (or
       the closing bid, if no sales were reported) as quoted on such system or
       exchange (or the exchange with the greatest volume of trading in common
       stock) on the last market trading day prior to the day of determination,
       as reported in the Wall Street Journal or such other source as the Board
       deems reliable;

              (ii)   If the common stock is quoted on the NASDAQ System (but not
       on the National Market System thereof) or is regularly quoted by a
       recognized securities dealer but selling prices are not reported, the
       Fair Market Value of a share of common stock shall be the mean between
       the high bid and high asked prices for the common stock on the last
       market trading day prior to the day of determination, as reported in the
       Wall Street Journal or such other source as the Board deems reliable;

              (iii)  In the absence of an established market for the common
       stock, the Fair Market Value shall be determined in good faith by the
       Board.

       (n)    "INCENTIVE STOCK OPTION" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

       (o)    "NON-EMPLOYEE DIRECTOR" means a Director who either (i) is not a
current Employee or Officer of the Company or its parent or subsidiary, does not
receive compensation (directly or indirectly) from the Company or its parent or
subsidiary for services rendered as a consultant or in any capacity other than
as a Director (except for an amount as to which disclosure would not be required
under Item 404(a) of Regulation S-K promulgated pursuant to the Securities Act),
does not possess an interest in any other transaction as to which disclosure
would be required under Item 404(a) of Regulation S-K, and is not engaged in a
business relationship as to which disclosure would be required under Item 404(b)
of Regulation S-K; or (ii) is otherwise considered a "non-employee director" for
purposes of Rule 16b-3.

       (p)    "NONSTATUTORY STOCK OPTION" means an Option not intended to
qualify as an Incentive Stock Option.

       (q)    "OFFICER" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

       (r)    "OPTION" means a stock option granted pursuant to the Plan.

       (s)    "OPTION AGREEMENT" means a written agreement between the Company
and an Optionee evidencing the terms and conditions of an individual Option
grant. The Option Agreement is subject to the terms and conditions of the Plan.

       (t)    "OPTIONED STOCK" means the common stock of the Company subject to
an Option.

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       (u)    "OPTIONEE" means a person who holds an outstanding Option.

       (v)    "OUTSIDE DIRECTOR" means a Director who either (i) is not a
current employee of the Company or an "affiliated corporation" (within the
meaning of the Treasury regulations promulgated under Section 162(m) of the
Code), is not a former employee of the Company or an "affiliated corporation"
receiving compensation for prior services (other than benefits under a tax
qualified pension plan), was not an officer of the Company or an "affiliated
corporation" at any time, and is not currently receiving direct or indirect
remuneration from the Company or an "affiliated corporation" for services in any
capacity other than as a Director, or (ii) is otherwise considered an "outside
director" for purposes of Section 162(m) of the Code.

       (w)    "PLAN" means this 1991 Stock Option Plan.

       (x)    "RULE 16b-3" means Rule 16b-3 of the Exchange Act or any successor
to Rule 16b-3, as in effect when discretion is being exercised with respect to
the Plan.

3.     ADMINISTRATION.

       (a)    The Board shall administer the Plan unless and until the Board
delegates administration to a Committee, as provided in subsection 3(c).

       (b)    The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

              (i)    To determine from time to time which of the persons
       eligible under the Plan shall be granted Options; when and how the Option
       shall be granted; whether the Option will be an Incentive Stock Option or
       a Nonstatutory Stock Option; the provisions of each Option granted (which
       need not be identical), including the time or times such Option may be
       exercised in whole or in part; and the number of shares for which an
       Option shall be granted to each such person.

              (ii)   To construe and interpret the Plan and Options granted
       under it, and to establish, amend and revoke rules and regulations for
       its administration. The Board, in the exercise of this power, may correct
       any defect, omission or inconsistency in the Plan or in any Option
       Agreement, in a manner and to the extent it shall deem necessary or
       expedient to make the Plan fully effective.

              (iii)  To amend the Plan as provided in Section 11.

              (iv)   Generally, to exercise such powers and to perform such acts
       as the Board deems necessary or expedient to promote the best interests
       of the Company.

       (c)    The Board may delegate administration of the Plan to a Committee
or Committees of one or more members of the Board. In the discretion of the
Board, a Committee may consist solely of two or more Outside Directors, in
accordance with Code Section 162(m), or solely of two or more Non-Employee
Directors, in accordance with Rule 16b-3 of the Exchange Act. If administration
is delegated to a Committee, the Committee shall have, in connection with the
administration of the Plan, the powers theretofore possessed by the Board (and
references in this Plan to the Board shall thereafter be to the Committee),
subject, however, to such resolutions, not inconsistent with the provisions of
the Plan, as may be adopted from time to time by the Board. The Board may
abolish the Committee at any time and revest in the Board the administration of
the Plan. Within the scope of this authority, the Board or the Committee may
delegate to a committee of one or more members of the Board the authority to
grant Options to eligible persons who (1) are not then subject to Section 16 of
the Exchange Act and/or (2) are either (i) not then Covered Employees and are
not expected to be Covered Employees at the time of recognition of income
resulting from such Option, or (ii) not persons with respect to whom the Company
wishes to comply with Section 162(m) of the Code.

4.     SHARES SUBJECT TO THE PLAN.

       (a)    Subject to the provisions of Section 10 relating to adjustments
upon changes in stock, the stock that may be sold pursuant to Options shall not
exceed in the aggregate ten million seven hundred fifty thousand (10,750,000)
shares of the Company's common stock. If any Option shall for any reason expire
or otherwise terminate, in whole or in part, without having been exercised in
full, the stock not purchased under such Option shall revert to again become
available for issuance under the Plan.

       (b)    The stock subject to the Plan may be unissued shares or reacquired
shares, bought on the market or otherwise.

5.     ELIGIBILITY.

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       (a)    Incentive Stock Options may be granted only to Employees.
Nonstatutory Stock Options may be granted to Employees, Directors and
Consultants.

       (b)    No person shall be eligible for the grant of an Incentive Stock
Option if, at the time of grant, such person owns (or is deemed to own pursuant
to Section 424(d) of the Code) stock possessing more than ten percent (10%) of
the total combined voting power of all classes of stock of the Company or of any
of its Affiliates unless the exercise price of such Option is at least one
hundred ten percent (110%) of the Fair Market Value of such stock at the date of
grant and the Option is not exercisable after the expiration of five (5) years
from the date of grant.

       (c)    Subject to the provisions of Section 10 relating to adjustments
upon changes in stock, no person shall be eligible to be granted Options
covering more than Five Hundred Thousand (500,000) shares of the Company's
common stock in any calendar year.

6.     OPTION PROVISIONS.

       Each Option shall be in such form and shall contain such terms and
conditions as the Board shall deem appropriate. The provisions of separate
Options need not be identical, but each Option shall include (through
incorporation of provisions hereof by reference in the Option or otherwise) the
substance of each of the following provisions:

      (a)     TERM. No Option shall be exercisable after the expiration of ten
(10) years from the date it was granted.

      (b)     PRICE.

              (i)    EXERCISE PRICE. The exercise price of each Incentive Stock
       Option and each Nonstatutory Stock Option shall be not less than one
       hundred percent (100%) of the fair market value of the stock subject to
       the Option on the date the Option is granted.

              (ii)   NO AUTHORITY TO REPRICE. Without the consent of the
       stockholders of the Company, the Board shall have no authority to effect
       (a) the repricing of any outstanding Options under the Plan and/or
       (b) the cancellation of any outstanding Options under the Plan and
       the grant in substitution therefor of new Options under the Plan
       covering the same or different numbers of shares of Common Stock.

       (c)    CONSIDERATION. The purchase price of stock acquired pursuant to
an Option shall be paid, to the extent permitted by applicable statutes
and regulations, either

              (i)    in cash at the time the Option is exercised, or

              (ii)   at the discretion of the Board or the Committee, at the
       time of the grant of the Option, (A) by delivery to the Company of other
       common stock of the Company, (B) according to a deferred payment
       arrangement, except that payment of the common stock's "par value" (as
       defined in the Delaware General Corporation Law) shall not be made by
       deferred payment or other arrangement (which may include, without
       limiting the generality of the foregoing, the use of other common stock
       of the Company) with the person to whom the Option is granted or to whom
       the Option is transferred pursuant to subsection 6(d), or (C) in any
       other form of legal consideration that may be acceptable to the Board.

       In the case of any deferred payment arrangement, interest shall be
       compounded at least annually and shall be charged at the minimum rate
       of interest necessary to avoid the treatment as interest, under any
       applicable provisions of the Code, of any amounts other than amounts
       stated to be interest under the deferred payment arrangement.

       (d)    TRANSFERABILITY. An Incentive Stock Option shall not be
transferable except by will or by the laws of descent and
distribution, and shall be exercisable during the lifetime of the
person to whom the Option is granted only by such person. A
Nonstatutory Stock Option but not an Incentive Stock Option, may be
transferred to the extent provided in the Option Agreement; provided
that if the Option Agreement does not expressly permit the transfer of
a Nonstatutory Stock Option, the Nonstatutory Stock Option shall not
be transferable except by will, by the laws of descent and
distribution and shall be exercisable during the lifetime of the
person to whom the Option is granted only by such person. The person
to whom the Option is granted may, by delivering written notice to the
Company, in a form satisfactory to the Company, designate a third
party who, in the event of the death of the Optionee, shall thereafter
be entitled to exercise the Option.

       (e)    VESTING. The total number of shares of stock subject to an
Option may, but need not, be allotted in periodic installments (which
may, but need not, be equal). The Option Agreement may provide that
from time to time during each of such installment periods, the Option
may become exercisable ("vest") with respect to some or all of the
shares allotted to that period, and may be exercised with respect to
some or all of the shares allotted to such period and/or any prior
period as to which the Option became vested but was not fully
exercised. During the remainder of the term of the Option (if its term
extends beyond the end of the installment periods), the option may be
exercised from time to time with respect to any shares then remaining
subject to he Option. The Option may be subject to such other terms
and conditions on the time or times when it may be exercised (which
may be based on performance or other criteria) as the Board may deem
appropriate. The provisions of this subsection 6(e) are subject to any
Option provisions governing the minimum number of shares as to which
an Option may be exercised.

       (f)    SECURITIES LAW COMPLIANCE. The Company may require any
Optionee, or any person to whom an Option is transferred under subsection
6(d), as a condition of exercising any such Option, (1) to give written
assurances satisfactory to the Company as to the Optionee's knowledge and
experience in financial and business matters and/or to employ a purchaser
representative reasonably satisfactory to the Company who is knowledgeable
and

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experienced in financial and business matters, and that he or she is capable
of evaluating, alone or together with the purchaser representative, the
merits and risks of exercising the Option; and (2) to give written assurances
satisfactory to the Company stating that such person is acquiring the stock
subject to the Option for such person's own account and not with any present
intention of selling or otherwise distributing the stock. These requirements,
and any assurances given pursuant to such requirements, shall be inoperative
if (i) the issuance of the shares upon the exercise of the Option has been
registered under a then currently effective registration statement under the
Securities Act of 1933, as amended (the "Securities Act"), or (ii) as to any
particular requirement, a determination is made by counsel for the Company
that such requirement need not be met in the circumstances under the then
applicable securities laws. The Company may require the Optionee to provide
such other representations, written assurances, or information which the
Company shall determine is necessary, desirable or appropriate to comply with
applicable securities and other laws as a condition of granting an Option to
such Optionee or permitting the Optionee to exercise such Option. The Company
may, upon advice of counsel to the Company, place legends on stock
certificates issued under the Plan as such counsel deems necessary or
appropriate in order to comply with applicable securities laws, including,
but not limited to, legends restricting the transfer of the stock.

       (g)    TERMINATION OF EMPLOYMENT OR CONSULTING RELATIONSHIP. In the
event an Optionee's Continuous Service terminates (other than upon the
Optionee's death or Disability), the Optionee may exercise his or her Option,
but only within such period of time as is determined by the Board, and only
to the extent that the Optionee was entitled to exercise it at the date of
termination (but in no event later than the expiration of the term of such
Option as set forth in the Option Agreement). In the case of an Incentive
Stock Option, the Board shall determine such period of time (in no event to
exceed ninety (90) days from the date of termination) when the Option is
granted. If, at the date of termination, the Optionee is not entitled to
exercise his or her entire Option, the shares covered by the unexercisable
portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified in the
Option Agreement, the Option shall terminate, and the shares covered by such
Option shall revert to the Plan.

       (h)    DISABILITY OF OPTIONEE. In the event an Optionee's Continuous
Service terminates as a result of the Optionee's Disability, the Optionee may
exercise his or her Option, but only within twelve (12) months from the date
of such termination (or such shorter period specified in the Option
Agreement), and only to the extent that the Optionee was entitled to exercise
it at the date of such termination (but in no event later than the expiration
of the term of such Option as set forth in the Option Agreement). If, at the
date of termination, the Optionee is not entitled to exercise his or her
entire Option, the shares covered by the unexercisable portion of the Option
shall revert to the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified herein, the Option shall
terminate, and the shares covered by such Option shall revert to the Plan.

       (i)    DEATH OF OPTIONEE. In the event of the death of an Optionee, the
Option may be exercised, at any time within twelve (12) months following the
date of death (or such shorter period specified in the Option Agreement) (but
in no event later than the expiration of the term of such Option as set forth
in the Option Agreement), by the Optionee's estate or by a person who
acquired the right to exercise the Option by bequest or inheritance, but only
to the extent the Optionee was entitled to exercise the Option at the date of
death. If, at the time of death, the Optionee was not entitled to exercise
his or her entire Option, the shares covered by the unexercisable portion of
the Option shall revert to the Plan. If, after death, the Optionee's estate
or a person who acquired the right to exercise the Option by bequest or
inheritance does not exercise the Option within the time specified herein,
the Option shall terminate, and the shares covered by such Option shall
revert to the Plan.

       (j)    EARLY EXERCISE. The Option may, but need not, include a
provision whereby the Optionee may elect at any time while an Employee or
Consultant to exercise the Option as to any part or all of the shares subject
to the Option prior to the full vesting of the Option. Any unvested shares so
purchased may be subject to a repurchase right in favor of the Company or to
any other restriction the Board determines to be appropriate.

       (k)    WITHHOLDING. To the extent provided by the terms of an Option
Agreement, the Optionee may satisfy any federal, state or local tax
withholding obligation relating to the exercise of such Option by any of the
following means or by a combination of such means: (1) tendering a cash
payment; (2) authorizing the Company to withhold shares from the shares of
the common stock otherwise issuable to the Optionee as a result of the
exercise of the Option; or (3) delivering to the Company owned and
unencumbered shares of the common stock of the Company.

7.     COVENANTS OF THE COMPANY.

       (a)    During the terms of the Options, the Company shall keep available
at all times the number of shares of stock required to satisfy such Options.

       (b)    The Company shall seek to obtain from each regulatory commission
or agency having jurisdiction over the Plan such authority as may be required to
issue and sell shares of stock upon exercise of the Options; provided, however,
that this undertaking shall not require the Company to register under the
Securities Act either the Plan, any Option or any stock issued or issuable
pursuant to any such Option. If, after reasonable efforts, the Company is unable
to obtain from any such regulatory commission or agency the authority which
counsel for the Company deems necessary for the lawful issuance and sale of
stock under the Plan, the Company shall be relieved from any liability for
failure to issue and sell stock upon exercise of such Options unless and until
such authority is obtained.

<PAGE>

8.     USE OF PROCEEDS FROM STOCK.

       Proceeds from the sale of stock pursuant to Options shall constitute
general funds of the Company.

9.     MISCELLANEOUS.

       (a)    The Board shall have the power to accelerate the time at which an
Option may first be exercised or the time during which an Option or any part
thereof will vest pursuant to subsection 6(e), notwithstanding the provisions in
the Option stating the time at which it may first be exercised or the time
during which it will vest.

       (b)    Neither an Optionee nor any person to whom an Option is
transferred under subsection 6(d) shall be deemed to be the holder of, or to
have any of the rights of a holder with respect to, any shares subject to such
Option unless and until such person has satisfied all requirements for exercise
of the Option pursuant to its terms.

       (c)    Nothing in the Plan or any instrument executed or Option granted
pursuant thereto shall confer upon any Employee, Consultant or Optionee any
right to continue in the employ of the Company or any Affiliate (or to continue
acting as a Consultant) or shall affect the right of the Company or any
Affiliate to terminate the employment or relationship as a Consultant of any
Employee, Consultant or Optionee with or without cause.

       (d)    To the extent that the aggregate Fair Market Value (determined at
the time of grant) of stock with respect to which Incentive Stock Options are
exercisable for the first time by any Optionee during any calendar year under
all plans of the Company and its Affiliates exceeds one hundred thousand dollars
($100,000), the Options or portions thereof which exceed such limit (according
to the order in which they were granted) shall be treated as Nonstatutory Stock
Options.

10.    ADJUSTMENTS UPON CHANGES IN STOCK.

       (a)    If any change is made in the stock subject to the Plan, or subject
to any Option (through merger, consolidation, reorganization, recapitalization,
stock dividend, dividend in property other than cash, stock split, liquidating
dividend, combination of shares, exchange of shares, change in corporate
structure or otherwise), the Plan will be appropriately adjusted in the
class(es) and maximum number of shares subject to the Plan pursuant to
subsection 4(a) and the maximum number of shares subject to award to any person
during any calendar year period pursuant to subsection 5(d), and the outstanding
Options will be appropriately adjusted in the class(es) and number of shares and
price per share of stock subject to such outstanding Options.

       (b)    In the event of: (1) a dissolution or liquidation of the Company;
(2) a merger or consolidation in which the Company is not the surviving
corporation; (3) a reverse merger in which the Company is the surviving
corporation but the shares of the Company's common stock outstanding immediately
preceding the merger are converted by virtue of the merger into other property,
whether in the form of securities, cash or otherwise; or (4) any other capital
reorganization in which more than fifty percent (50%) of the shares of the
Company entitled to vote are exchanged, then, at the sole discretion of the
Board and to the extent permitted by applicable law: (i) any surviving
corporation shall assume any Options outstanding under the Plan or shall
substitute similar Options for those outstanding under the Plan, (ii) the time
during which such Options may be exercised shall be accelerated and the Options
terminated if not exercised prior to such event, or (iii) such Options shall
continue in full force and effect.

       (c)    Notwithstanding any other provisions of this Plan to the contrary,
if an event occurs as specified in subsection 10(b) (a "Change in Control") and
if within one (1) month before or thirteen (13) months after the date of such
Change in Control the Continuous Service of an Optionee terminates due to an
involuntary termination (not including death or Disability) without Cause (as
such term is defined below) or a voluntary termination by the Optionee due to a
Constructive Termination (as such term is defined below), then the vesting and
exercisability of all Options held by such Optionee shall be accelerated, or any
reacquisition or repurchase rights held by the Company with respect to an option
shall lapse, as follows. With respect to those Options held by an Optionee at
the time of such termination, one hundred percent (100%) of the unvested shares
covered by such Options shall vest and become exercisable (or reacquisition or
repurchase rights held by the Company shall lapse with respect to one hundred
percent (100%) of the shares still subject to such rights, as appropriate) as of
the date of such termination. Notwithstanding the foregoing, however, if such
potential acceleration of the vesting and exercisability of Options (or lapse of
reacquisition or repurchase rights held by the Company with respect to Options)
would cause a contemplated Change in Control transaction that would otherwise be
eligible to be accounted for as a "pooling-of-interests" transaction to become
ineligible for such accounting treatment under generally accepted accounting
principles as determined by the Company's independent public accountants (the
"Accountants") prior to the Change of Control, such acceleration shall not
occur.

       For the purposes of this subsection 10(c) only, "Cause" means (i)
conviction of, a guilty plea with respect to, or a plea of NOLO CONTENDERE to a
charge that an Optionee has committed a felony under the laws of the United
States or of any state or a crime involving moral turpitude, including, but not
limited to, fraud, theft, embezzlement or any crime that results in or is
intended to result in personal enrichment at the expense of the Company or an
Affiliate; (ii) material breach of any agreement entered into between the
Optionee and the

<PAGE>

Company or an Affiliate that impairs the Company's or the Affiliate's interest
therein; (iii) willful misconduct, significant failure of the Optionee to
perform the Optionee's duties, or gross neglect by the Optionee of the
Optionee's duties; or (iv) engagement in any activity that constitutes a
material conflict of interest with the Company or any Affiliate.

       For purposes of this subsection 10(c) only, "Constructive Termination"
means the occurrence of any of the following events or conditions: (i) (A) a
change in the Optionee's status, title, position or responsibilities (including
reporting responsibilities) which represents an adverse change from the
Optionee's status, title, position or responsibilities as in effect at any time
within ninety (90) days preceding the date of a Change in Control or at any time
thereafter; (B) the assignment to the Optionee of any duties or responsibilities
which are inconsistent with the Optionee's status, title, position or
responsibilities as in effect at any time within ninety (90) days preceding the
date of a Change in Control or at any time thereafter; or (C) any removal of the
Optionee from or failure to reappoint or reelect the Optionee to any of such
offices or positions, except in connection with the termination of the
Optionee's Continuous Service for Cause, as a result of the Optionee's
Disability or death or by the Optionee other than as a result of Constructive
Termination; (ii) a reduction in the Optionee's annual base compensation or any
failure to pay the Optionee any compensation or benefits to which the Optionee
is entitled within five (5) days of the date due; (iii) the Company's requiring
the Optionee to relocate to any place outside a fifty (50) mile radius of the
Optionee's current work site, except for reasonably required travel on the
business of the Company or its Affiliates which is not materially greater than
such travel requirements prior to the Change in Control; (iv) the failure by the
Company to (A) continue in effect (without reduction in benefit level and/or
reward opportunities) any material compensation or employee benefit plan in
which the Optionee was participating at any time within ninety (90) days
preceding the date of a Change in Control or at any time thereafter, unless such
plan is replaced with a plan that provides substantially equivalent compensation
or benefits to the Optionee, or (B) provide the Optionee with compensation and
benefits, in the aggregate, at least equal (in terms of benefit levels and/or
reward opportunities) to those provided for under each other employee benefit
plan, program and practice in which the Optionee was participating at any time
within ninety (90) days preceding the date of a Change in Control or at any time
thereafter; (v) any material breach by the Company of any provision of an
agreement between the Company and the Optionee, whether pursuant to this Plan or
otherwise, other than a breach which is cured by the Company within fifteen (15)
days following notice by the Optionee of such breach; or (vi) the failure of the
Company to obtain an agreement, satisfactory to the Optionee, from any
successors and assigns to assume and agree to perform the obligations created
under this Plan.

       (d)    In the event that the acceleration of the vesting and
exercisability of the Options or lapse of reacquisition or repurchase rights
held by the Company with respect to Options provided for in subsection 10(c) and
benefits otherwise payable to an Optionee (i) constitute "parachute payments"
within the meaning of Section 280G (as it may be amended or replaced) of the
Code, and (ii) but for this subsection 10(d) would be subject to the excise tax
imposed by Section 4999 (as it may be amended or replaced) of the Code (the
"Excise Tax"), then such Optionee's benefits hereunder shall be delivered to
such lesser extent which would result in no portion of such benefits being
subject to the Excise Tax; PROVIDED, HOWEVER, that the benefits hereunder shall
be reduced only to the extent necessary after all cash amounts otherwise payable
to such Optionee and which constitute "parachute payments" have been returned.
Unless the Company and such Optionee otherwise agree in writing, any
determination required under this subsection 10(d) shall be made in writing in
good faith by the Accountants. For purposes of making the calculations required
by this subsection 10(d), the Accountants may make reasonable assumptions and
approximations concerning applicable taxes and may rely on reasonable, good
faith interpretations concerning the application of the Code. The Company and
such Optionees shall furnish to the Accountants such information and documents
as the Accountants may reasonably request in order to make a determination under
this subsection 10(d). The Company shall bear all costs the Accountants may
reasonably incur in connection with any calculations contemplated by this
subsection 10(d).

11.    AMENDMENT OF THE PLAN.

       (a)    The Board at any time, and from time to time, may amend the Plan.
However, except as provided in Section 10 relating to adjustments upon changes
in stock, no amendment shall be effective unless approved by the stockholders of
the Company within twelve (12) months before or after the adoption of the
amendment, where the amendment will:

              (i)    Increase the number of shares reserved for options under
       the Plan;

              (ii)   Effect (a) the repricing of any outstanding Options under
       the Plan and/or (b) the cancellation of any outstanding Options under the
       Plan and the grant in substitution therefor of new Options under the Plan
       covering the same or different numbers of shares of Common Stock;

              (iii)  Modify the requirements as to eligibility for participation
       in the Plan (to the extent such modification requires stockholder
       approval in order for the Plan to satisfy the requirements of Section 422
       of the Code); or

              (iv)   Modify the Plan in any other way if such modification
       requires stockholder approval in order for the Plan to satisfy the
       requirements of Section 422 of the Code or to comply with the
       requirements of Rule 16b-3 or any Nasdaq or securities exchange listing
       requirements.

       (b)    The Board may in its sole discretion submit any other amendment to
the Plan for stockholder approval, including, but

<PAGE>

not limited to, amendments to the Plan intended to satisfy the requirements of
Section 162(m) of the Code and the regulations promulgated thereunder regarding
the exclusion of performance-based compensation from the limit on corporate
deductibility of compensation paid to certain executive officers.

       (c)    It is expressly contemplated that the Board may amend the Plan in
any respect the Board deems necessary or advisable to provide Optionees with the
maximum benefits provided or to be provided under the provisions of the Code and
the regulations promulgated thereunder relating to Incentive Stock Options
and/or to bring the Plan and/or Incentive Stock Options granted under it into
compliance therewith.

       (d)    Rights and obligations under any Option granted before amendment
of the Plan shall not be altered or impaired by any amendment of the Plan unless
(i) the Company requests the consent of the person to whom the Option was
granted and (ii) such person consents in writing.

12.    TERMINATION OR SUSPENSION OF THE PLAN.

       (a)    The Board may suspend or terminate the Plan at any time. Unless
sooner terminated, the Plan shall terminate on April 30, 2010, which is a date
within ten (10) years following stockholder approval of the amended and restated
Plan adopted by the Board on April 5, 2000. No Options may be granted under the
Plan while the Plan is suspended or after it is terminated.

       (b)    Rights and obligations under any Option granted while the Plan is
in effect shall not be altered or impaired by suspension or termination of the
Plan, except with the consent of the person to whom the Option was granted.

13.    EFFECTIVE DATE OF PLAN.

       The Plan shall become effective as determined by the Board, but no
Options granted under the Plan shall be exercised unless and until the
stockholders of the Company have approved the Plan.

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