Document:

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                                                                   EXHIBIT 10.18

                                 ALLECURE CORP.

                        2000 STOCK OPTION AND STOCK PLAN

      1.    Purposes of the Plan. The purposes of this Stock Option and Stock
Plan are to attract and retain the best available personnel for positions of
substantial responsibility, to provide additional incentive to Employees,
Directors and Consultants and to promote the success of the Company's business.
Options granted under the Plan may be Incentive Stock Options or Nonstatutory
Stock Options, as determined by the Administrator at the time of grant. Stock
Purchase Rights may also be granted under the Plan.

      2.    Definitions. As used herein, the following definitions shall apply:

            (a)   "Administrator" means the Board or any of its Committees as
shall be administering the Plan in accordance with Section 4 hereof.

            (b)   "Applicable Laws" means the requirements relating to the
administration of stock option plans under U.S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any other country or jurisdiction where Options or Stock Purchase Rights are
granted under the Plan.

            (c)   "Board" means the Board of Directors of the Company.

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

            (e)   "Committee" means a committee of Directors appointed by the
Board in accordance with Section 4 hereof.

            (f)   "Common Stock" means the Common Stock of the Company.

            (g)   "Company" means AlleCure Corp., a Delaware corporation.

            (h)   "Consultant" means any person who is engaged by the Company or
any Parent or Subsidiary to render consulting or advisory services to such
entity.

            (i)   "Director" means a member of the Board of Directors of the
Company.

            (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 Parent or Subsidiary of the Company. A Service
Provider shall not cease to be an Employee in the case of (i) any leave of
absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may

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exceed ninety days, unless reemployment upon expiration of such leave is
guaranteed by statute or contract. If reemployment upon expiration of a leave of
absence approved by the Company is not so guaranteed, on the 181st day of such
leave any Incentive Stock Option held by the Optionee shall cease to be treated
as an Incentive Stock Option and shall be treated for tax purposes as a
Nonstatutory Stock Option. 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 Common
Stock determined as follows:

                  (i)   If the Common Stock is listed on any established stock
      exchange or a national market system, including without limitation the
      Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock
      Market, its Fair Market Value shall be the closing sales price for such
      stock (or the closing bid, if no sales were reported) as quoted on such
      exchange or system for the last market trading day prior to the time of
      determination, as reported in The Wall Street Journal or such other source
      as the Administrator deems reliable;

                  (ii)  If the Common Stock is regularly quoted by a recognized
      securities dealer but selling prices are not reported, its Fair Market
      Value shall be the mean between the high bid and low asked prices for the
      Common Stock on the last market trading day prior to the day of
      determination; or

                  (iii) In the absence of an established market for the Common
      Stock, the Fair Market Value thereof shall be determined in good faith by
      the Administrator.

            (n)   "Incentive Stock Option" means an Option intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code.

            (o)   "Nonstatutory Stock Option" means an Option not intended to
qualify as an Incentive Stock Option.

            (p)   "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.

            (q)   "Option" means a stock option granted pursuant to the Plan.

            (r)   "Option Agreement" means a written or electronic agreement
between the Company and an Optionee evidencing the terms and conditions of an
individual Option grant. All Option Agreements shall be subject to the terms and
conditions of the Plan.

            (s)   "Option Exchange Program" means a program whereby outstanding
Options are exchanged for Options with a lower exercise price.

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            (t)   "Optioned Stock" means the Common Stock subject to an Option
or a Stock Purchase Right.

            (u)   "Optionee" means the holder of an outstanding Option or Stock
Purchase Right granted under the Plan.

            (v)   "Parent" means a "parent corporation," whether now or
hereafter existing, as defined in Section 424(e) of the Code.

            (w)   "Plan" means this 2000 Stock Option and Stock Plan.

            (x)   "Restricted Stock" means shares of Common Stock acquired
pursuant to a grant of a Stock Purchase Right under Section 11 below.

            (y)   "Section 16(b)" means Section 16(b) of the Exchange Act.

            (z)   "Service Provider" means an Employee, Director or Consultant.

            (aa)  "Share" means a share of the Common Stock, as adjusted in
accordance with Section 12 below.

            (bb)  "Stock Purchase Right" means a right to purchase Common Stock
pursuant to Section 11 below.

            (cc)  "Subsidiary" means a "subsidiary corporation," whether now or
hereafter existing, as defined in Section 424(f) of the Code.

      3.    Stock Subject to the Plan. Subject to the provisions of Section 12
of the Plan, the maximum aggregate number of Shares which may be subject to
option and sold under the Plan is One Million (1,000,000) Shares, all of which
can be granted to one or more Optionees; provided, however, that at no time
shall the total number of Shares issuable upon exercise of all outstanding
Options and the total number of Shares provided for under any stock bonus or
similar plan of the Company exceed the applicable percentage as calculated in
accordance with the conditions and exclusions set forth in Section 260.140.45 of
the California Code of Regulations, based on the Shares of the Company which are
outstanding at the time the calculation is made. The Shares may be authorized
but unissued shares of Common Stock, or Shares that have been previously granted
as Options or Stock Purchase Rights, but which have been reacquired or otherwise
reverted to the Plan.

            If an Option or Stock Purchase Right expires or becomes
unexercisable without having been exercised in full, or is surrendered pursuant
to an Option Exchange Program, the unpurchased Shares which were subject thereto
shall become available for future grant or sale under the Plan (unless the Plan
has terminated). However, Shares that have actually been issued under the Plan,
upon exercise of either an Option or Stock Purchase Right, shall not be returned
to the Plan and shall not become available for future distribution under the
Plan, except that if Shares of Restricted Stock are repurchased by the Company
at their original purchase price, such Shares shall become available for future
grant under the Plan.

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      4.    Administration of the Plan.

            (a)   Administrator. The Plan shall be administered by the Board or
a Committee appointed by the Board, which Committee shall be constituted to
comply with Applicable Laws.

            (b)   Powers of the Administrator. Subject to the provisions of the
Plan and, in the case of a Committee, the specific duties delegated by the Board
to such Committee, and subject to the approval of any relevant authorities, the
Administrator shall have the authority in its discretion:

                  (i)   to determine the Fair Market Value;

                  (ii)  to select the Service Providers to whom Options and
      Stock Purchase Rights may from time to time be granted hereunder;

                  (iii) to determine the number of Shares to be covered by each
      such award granted hereunder;

                  (iv)  to approve forms of agreement for use under the Plan;

                  (v)   to determine the terms and conditions of any Option or
      Stock Purchase Right granted hereunder. Such terms and conditions include,
      but are not limited to, the exercise price, the time or times when Options
      or Stock Purchase Rights may be exercised (which may be based on
      performance criteria), any vesting acceleration or waiver of forfeiture
      restrictions, and any restriction or limitation regarding any Option or
      Stock Purchase Right or the Common Stock relating thereto, based in each
      case on such factors as the Administrator, in its sole discretion, shall
      determine;

                  (vi)  to determine whether and under what circumstances an
      Option may be settled in cash under Section 9(e) instead of Common Stock;

                  (vii) to initiate an Option Exchange Program;

                  (viii) to prescribe, amend and rescind rules and regulations
      relating to the Plan, including rules and regulations relating to
      sub-plans established for the purpose of qualifying for preferred tax
      treatment under foreign tax laws;

                  (ix)  to allow Optionees to satisfy withholding tax
      obligations by electing to have the Company withhold from the Shares to be
      issued upon exercise of an Option or Stock Purchase Right that number of
      Shares having a Fair Market Value equal to the amount required to be
      withheld. The Fair Market Value of the Shares to be withheld shall be
      determined on the date that the amount of tax to be withheld is to be
      determined. All elections by Optionees to have Shares withheld for this
      purpose shall be made in such form and under such conditions as the
      Administrator may deem necessary or advisable; and

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                  (x)   to construe and interpret the terms of the Plan and
      awards granted pursuant to the Plan.

            (c)   Effect of Administrator's Decision. All decisions,
determinations and interpretations of the Administrator shall be final and
binding on all Optionees.

      5.    Eligibility.

            (a)   Incentive Stock Options may be granted only to Employees.
Nonstatutory Stock Options and Stock Purchase Rights may be granted to any
Service Provider.

            (b)   Each Option shall be designated in the Option Agreement as
either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of this
Section 5(b), Incentive Stock Options shall be taken into account in the order
in which they were granted. The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

            (c)   Neither the Plan nor any Option or Stock Purchase Right shall
confer upon any Optionee any right with respect to continuing the Optionee's
relationship as a Service Provider with the Company, nor shall it interfere in
any way with his or her right or the Company's right to terminate such
relationship at any time, with or without cause.

      6.    Term of Plan. The Plan shall become effective upon its adoption by
the Board. It shall continue in effect for a term of 10 years, unless sooner
terminated under Section 14 of the Plan.

      7.    Term of Option. The term of each Option shall be stated in the
applicable Option Agreement; provided, however, that the term shall be no more
than 10 years from the date of grant thereof. In the case of an Incentive Stock
Option granted to an Optionee who, at the time the Option is granted, owns stock
representing more than 10% of the voting power of all classes of stock of the
Company or any Parent or Subsidiary, the term of the Option shall be five years
from the date of grant or such shorter term as may be provided in the Option
Agreement.

      8.    Option Exercise Price and Consideration.

            (a)   The per share exercise price for the Shares to be issued upon
exercise of an Option shall be such price as is determined by the Administrator,
but shall be subject, to the following:

                  (i)   In the case of an Incentive Stock Option

                        (A)   granted to an Employee who, at the time of grant
      of such Option, owns stock representing more than 10% of the voting power
      of all classes of

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      stock of the Company or any Parent or Subsidiary, the exercise price shall
      be no less than 110% of the Fair Market Value per Share on the date of
      grant.

                        (B)   granted to any other Employee, the per Share
      exercise price shall be no less than 100% of the Fair Market Value per
      Share on the date of grant.

                  (ii)  In the case of a Nonstatutory Stock Option

                        (A)   granted to a Service Provider who, at the time of
      grant of such Option, owns stock representing more than 10% of the voting
      power of all classes of stock of the Company or any Parent or Subsidiary,
      the exercise price shall be no less than 110% of the Fair Market Value per
      Share on the date of grant.

                        (B)   granted to any other Service Provider, the per
      Share exercise price shall be no less than 85% of the Fair Market Value
      per Share on the date of grant.

                  (iii) Notwithstanding the foregoing, Options may be granted
      with a per Share exercise price other than as required above pursuant to a
      merger or other corporate transaction.

            (b)   The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant). Such consideration may consist of (1) cash,
(2) check, (3) promissory note, (4) other Shares which (x) in the case of Shares
acquired upon exercise of an Option, have been owned by the Optionee for more
than six months on the date of surrender, and (y) have a Fair Market Value on
the date of surrender equal to the aggregate exercise price of the Shares as to
which such Option shall be exercised, (5) consideration received by the Company
under a cashless exercise program implemented by the Company in connection with
the Plan, or (6) any combination of the foregoing methods of payment. In making
its determination as to the type of consideration to accept, the Administrator
shall consider if acceptance of such consideration may be reasonably expected to
benefit the Company.

      8.    Exercise of Option.

            (a)   Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable according to the terms hereof at such
times and under such conditions as determined by the Administrator and set forth
in the Option Agreement. Except in the case of Options granted to Officers,
Directors and Consultants, Options shall become exercisable at a rate of no less
than 20% per year over five years from the date the Options are granted. Unless
the Administrator provides otherwise, vesting of Options granted hereunder shall
be tolled during any unpaid leave of absence. An Option may not be exercised for
a fraction of a Share.

            An Option shall be deemed exercised when the Company receives: (i)
written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled

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to exercise the Option, and (ii) full payment for the Shares with respect to
which the Option is exercised. Full payment may consist of any consideration and
method of payment authorized by the Administrator and permitted by the Option
Agreement and the Plan. Shares issued upon exercise of an Option shall be issued
in the name of the Optionee or, if requested by the Optionee, in the name of the
Optionee and his or her spouse. Until the Shares are issued (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company), no right to vote or receive dividends or any other rights
as a stockholder shall exist with respect to the Shares, notwithstanding the
exercise of the Option. The Company shall issue (or cause to be issued) such
Shares promptly after the Option is exercised. No adjustment will be made for a
dividend or other right for which the record date is prior to the date the
Shares are issued, except as provided in Section 12 of the Plan.

            Exercise of an Option in any manner shall result in a decrease in
the number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

            (b)   Termination of Relationship as a Service Provider. If an
Optionee ceases to be a Service Provider, such Optionee may exercise his or her
Option within such period of time as is specified in the Option Agreement (of at
least 30 days) to the extent that the Option is vested on the date of
termination (but in no event later than the expiration of the term of the Option
as set forth in the Option Agreement). In the absence of a specified time in the
Option Agreement, the Option shall remain exercisable for three months following
the Optionee's termination. If, on the date of termination, the Optionee is not
vested as to his or her entire Option, the Shares covered by the unvested
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 by the
Administrator, the Option shall terminate, and the Shares covered by such Option
shall revert to the Plan.

            (c)   Disability of Optionee. If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
(of at least six months) to the extent the Option is vested on 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 absence of a specified time
in the Option Agreement, the Option shall remain exercisable for 12 months
following the Optionee's termination. If, on the date of termination, the
Optionee is not vested as to his or her entire Option, the Shares covered by
the unvested 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.

            (d)   Death of Optionee. If an Optionee dies while a Service
Provider, the Option may be exercised within such period of time as is specified
in the Option Agreement (of at least six months) to the extent that the Option
is vested on the date of death (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 acquires the right to exercise the Option by bequest
or inheritance. In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for 12 months following the Optionee's
termination. If, at the time of death, the

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Optionee is not vested as to the entire Option, the Shares covered by the
unvested portion of the Option shall immediately revert to the Plan. If the
Option is not so exercised within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

            (e)   Buyout Provisions. The Administrator may at any time offer to
buy out for a payment in cash or Shares, an Option previously granted, based on
such terms and conditions as the Administrator shall establish and communicate
to the Optionee at the time that such offer is made.

      9.    Non-Transferability of Options and Stock Purchase Rights. The
Options and Stock Purchase Rights may not be sold, pledged, assigned,
hypothecated, transferred or disposed of in any manner other than by will or by
the laws of descent or distribution and may be exercised, during the lifetime of
the Optionee, only by the Optionee.

      10.   Stock Purchase Rights.

            (a)   Rights to Purchase. Stock Purchase Rights may be issued either
alone,' in addition to, or in tandem with other awards granted under the Plan
and/or cash, awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing or electronically of the terms, conditions and restrictions
related to the offer, including the number of Shares that such person shall be
entitled to purchase, the price to be paid, and the time within which such
person must accept such offer. The terms of the offer shall comply in all
respects with Section 260.140.42 of Title 10 of the California Code of
Regulations. The offer shall be accepted by execution of a Restricted Stock
Purchase Agreement in the form determined by the Administrator.

            (b)   Repurchase Option. Unless the Administrator determines
otherwise, the Restricted Stock purchase agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's service with the Company for any reason (including death or
disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock purchase agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option shall lapse at such rate as the
Administrator may determine. Except with respect to Shares purchased by Officers
and Directors, the repurchase option shall lapse at a rate of no less than 20%
per year over five years from the date of purchase.

            (c)   Other Provisions. The Restricted Stock purchase agreement
shall contain such other terms, provisions and conditions not inconsistent with
the Plan as may be determined by the Administrator in its sole discretion.

            (d)   Rights as a Stockholder. Once the Stock Purchase Right is
exercised, the purchaser shall have rights equivalent to those of a stockholder
and shall be a stockholder when his or her purchase is entered upon the records
of the duly authorized transfer agent of the Company. No adjustment shall be
made for a dividend or other right for which the record date is

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prior to the date the Stock Purchase Right is exercised, except as provided in
Section 12 of the Plan.

      11.   Adjustments Upon Changes in Capitalization, Merger or Asset Sale.

            (a)   Changes in Capitalization. Subject to any required action by
the stockholders of the Company, the number of shares of Common Stock covered
by each outstanding Option or Stock Purchase Right, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options or Stock Purchase Rights have yet been granted or which have
been returned to the Plan upon cancellation or expiration of an Option or Stock
Purchase Right, as well as the price per share of Common Stock covered by each
such outstanding Option or Stock Purchase Right, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company. The conversion of any convertible securities of
the Company shall not be deemed to have been "effected without receipt of
consideration." Such adjustment shall be made by the Board, whose determination
in that respect shall be final, binding and conclusive. Except as expressly
provided herein, no issuance by the Company of shares of stock of any class, or
securities convertible into shares of stock of any class, shall affect, and no
adjustment by reason thereof shall be made with respect to, the number or price
of shares of Common Stock subject to an Option or Stock Purchase Right.

            (b)   Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option or Stock Purchase Right until 15
days prior to such transaction as to all of the Optioned Stock covered thereby,
including Shares as to which the Option or Stock Purchase Right would not
otherwise be exercisable. In addition, the Administrator may provide that any
Company repurchase option applicable to any Shares purchased upon exercise of an
Option or Stock Purchase Right shall lapse as to all such Shares, provided the
proposed dissolution or liquidation takes place at the time and in the manner
contemplated. To the extent it has not been previously exercised, an Option or
Stock Purchase Right will terminate immediately prior to the consummation of
such proposed action.

            (c)   Merger or Asset Sale. In the event of a merger of the Company
with or into another corporation, or the sale of substantially all of the assets
of the Company, each outstanding Option and Stock Purchase Right shall be
assumed or an equivalent option or right substituted by the successor
corporation or a Parent or Subsidiary of the successor corporation. In the event
that the successor corporation refuses to assume or substitute for the Option or
Stock Purchase Right, the Optionee shall fully vest in and have the right to
exercise the Option or Stock Purchase Right as to all of the Optioned Stock,
including Shares as to which it would not otherwise be vested or exercisable. If
an Option or Stock Purchase Right becomes fully vested and exercisable in lieu
of assumption or substitution in the event of a merger or sale of assets, the
Administrator shall notify the Optionee in writing or electronically that the
Option or Stock Purchase Right shall be fully exercisable for a period of 15
days from the date of such notice, and

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the Option or Stock Purchase Right shall terminate upon the expiration of such
period. For the purposes of this paragraph, the Option or Stock Purchase Right
shall be considered assumed if, following the merger or sale of assets, the
option or right confers the right to purchase or receive, for each Share of
Optioned Stock subject to the Option or Stock Purchase Right immediately prior
to the merger or sale of assets, the consideration (whether stock, cash or other
securities or property) received in the merger or sale of assets by holders of
Common Stock for each Share held on the effective date of the transaction (and
if holders were offered a choice of consideration, the type of consideration
chosen by the holders of a majority of the outstanding Shares); provided,
however, that if such consideration received in the merger or sale of assets is
not solely common stock of the successor corporation or its Parent, the
Administrator may, with the consent of the successor corporation, provide for
the consideration to be received upon the exercise of the Option or Stock
Purchase Right, for each Share of Optioned Stock subject to the Option or Stock
Purchase Right, to be solely common stock of the successor corporation or its
Parent equal in fair market value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

      12.   Time of Granting Options and Stock Purchase Rights. The date of
grant of an Option or Stock Purchase Right shall, for all purposes, be the date
on which the Administrator makes the determination granting such Option or Stock
Purchase Right, or such other date as is determined by the Administrator. Notice
of the determination shall be given to each Service Provider to whom an Option
or Stock Purchase Right is so granted within a reasonable time after the date of
such grant.

      13.   Amendment and Termination of the Plan.

            (a)   Amendment and Termination. The Board may at any time amend,
alter, suspend or terminate the Plan.

            (b)   Stockholder Approval. The Board shall obtain stockholder
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

            (c)   Effect of Amendment or Termination. No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options granted under the
Plan prior to the date of such termination.

      14.   Conditions Upon Issuance of Shares.

            (a)   Legal Compliance. Shares shall not be issued pursuant to the
exercise of an Option unless the exercise of such Option and the issuance and
delivery of such Shares shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance.

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            (b)   Investment Representations. As a condition to the exercise of
an Option, the Administrator may require the person exercising such Option to
represent and warrant at the time of any such exercise that the Shares are being
purchased only for investment and without any present intention to sell or
distribute such Shares if, in the opinion of counsel for the Company, such a
representation is required.

      15.   Inability to Obtain Authority. The inability of the Company to
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

      16.   Reservation of Shares. The Company, during the term of this Plan,
shall at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

      17.   Stockholder Approval. The Plan shall be subject to approval by the
stockholders of the Company within 12 months after the date the Plan is adopted.
Such stockholder approval shall be obtained in the degree and manner required
under Applicable Laws.

      18.   Information to Optionees and Purchasers. The Company shall provide
to each Optionee and to each individual who acquires Shares pursuant to the
Plan, not less frequently than annually during the period such Optionee or
purchaser has one or more Options or Stock Purchase Rights outstanding, and, in
the case of an individual who acquires Shares pursuant to the Plan, during the
period such individual owns such Shares, copies of annual financial statements.
The Company shall not be required to provide such statements to key employees
whose duties in connection with the Company assure their access to equivalent
information.

                                       11<PAGE>
                                                                   EXHIBIT 10.19

                            CTL IMMUNOTHERAPIES CORP.

                        2000 STOCK OPTION AND STOCK PLAN

      1.    Purposes of the Plan. The purposes of this Stock Option and Stock
Plan are to attract and retain the best available personnel for positions of
substantial responsibility, to provide additional incentive to Employees,
Directors and Consultants and to promote the success of the Company's business.
Options granted under the Plan may be Incentive Stock Options or Nonstatutory
Stock Options, as determined by the Administrator at the time of grant. Stock
Purchase Rights may also be granted under the Plan.

      2.    Definitions. As used herein, the following definitions shall apply:

            (a)   "Administrator" means the Board or any of its Committees as
shall be administering the Plan in accordance with Section 4 hereof.

            (b)   "Applicable Laws" means the requirements relating to the
administration of stock option plans under U.S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any other country or jurisdiction where Options or Stock Purchase Rights are
granted under the Plan.

            (c)   "Board" means the Board of Directors of the Company.

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

            (e)   "Committee" means a committee of Directors appointed by the
Board in accordance with Section 4 hereof.

            (f)   "Common Stock" means the Common Stock of the Company.

            (g) "Company" means CTL ImmunoTherapies Corp., a Delaware
corporation.

            (h)   "Consultant" means any person who is engaged by the Company or
any Parent or Subsidiary to render consulting or advisory services to such
entity.

            (i)   "Director" means a member of the Board of Directors of the
Company.

            (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 Parent or Subsidiary of the Company. A Service
Provider shall not cease to be an Employee in the case of (i) any leave of
absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may

<PAGE>

exceed ninety days, unless reemployment upon expiration of such leave is
guaranteed by statute or contract. If reemployment upon expiration of a leave of
absence approved by the Company is not so guaranteed, on the 181st day of such
leave any Incentive Stock Option held by the Optionee shall cease to be treated
as an Incentive Stock Option and shall be treated for tax purposes as a
Nonstatutory Stock Option. Neither service as a Director nor payment of a
director's fee by the Company shall be sufficient to constitute "employment" by
the Company.

            (1)   "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

            (m)   "Fair Market Value" means, as of any date, the value of Common
Stock determined as follows:

                  (i)   If the Common Stock is listed on any established stock
      exchange or a national market system, including without limitation the
      Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock
      Market, its Fair Market Value shall be the closing sales price for such
      stock (or the closing bid, if no sales were reported) as quoted on such
      exchange or system for the last market trading day prior to the time of
      determination, as reported in The Wall Street Journal or such other source
      as the Administrator deems reliable;

                  (ii)  If the Common Stock is regularly quoted by a recognized
      securities dealer but selling prices are not reported, its Fair Market
      Value shall be the mean between the high bid and low asked prices for the
      Common Stock on the last market trading day prior to the day of
      determination; or

                  (iii) In the absence of an established market for the Common
      Stock, the Fair Market Value thereof shall be determined in good faith by
      the Administrator.

            (n)   "Incentive Stock Option" means an Option intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code.

            (o)   "Nonstatutory Stock Option" means an Option not intended to
qualify as an Incentive Stock Option.

            (p)   "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.

            (q)   "Option" means a stock option granted pursuant to the Plan.

            (r)   "Option Agreement" means a written or electronic agreement
between the Company and an Optionee evidencing the terms and conditions of an
individual Option grant. All Option Agreements shall be subject to the terms and
conditions of the Plan.

            (s)   "Option Exchange Program" means a program whereby outstanding
Options are exchanged for Options with a lower exercise price.

                                      -2-

<PAGE>

            (t)   "Optioned Stock" means the Common Stock subject to an Option
or a Stock Purchase Right.

            (u)   "Optionee" means the holder of an outstanding Option or Stock
Purchase Right granted under the Plan.

            (v)   "Parent" means a "parent corporation," whether now or
hereafter existing, as defined in Section 424(e) of the Code.

            (w)   "Plan" means this 2000 Stock Option and Stock Plan.

            (x)   "Restricted Stock" means shares of Common Stock acquired
pursuant to a grant of a Stock Purchase Right under Section 11 below.

            (y)   "Section 16(b)" means Section 16(b) of the Exchange Act.

            (z)   "Service Provider" means an Employee, Director or Consultant.

            (aa)  "Share" means a share of the Common Stock, as adjusted in
accordance with Section 12 below.

            (bb)  "Stock Purchase Right" means a right to purchase Common Stock
pursuant to Section 11 below.

            (cc)  "Subsidiary" means a "subsidiary corporation," whether now or
hereafter existing, as defined in Section 424(f) of the Code.

      3.    Stock Subject to the Plan. Subject to the provisions of Section 12
of the Plan, the maximum aggregate number of Shares which may be subject to
option and sold under the Plan is 5,250,000 Shares, all of which can be granted
to one or more Optionees; provided, however, that at no time shall the total
number of Shares issuable upon exercise of all outstanding Options and the total
number of Shares provided for under any stock bonus or similar plan of the
Company exceed the applicable percentage as calculated in accordance with the
conditions and exclusions set forth in Section 260.140.45 of the California Code
of Regulations, based on the Shares of the Company which are outstanding at the
time the calculation is made, all of which can be granted to one or more
Optionees. The Shares may be authorized but unissued shares of Common Stock, or
Shares that have been previously granted as Options or Stock Purchase Rights,
but which have been reacquired or otherwise reverted to the Plan.

            If an Option or Stock Purchase Right expires or becomes
unexercisable without having been exercised in full, or is surrendered pursuant
to an Option Exchange Program, the unpurchased Shares which were subject thereto
shall become available for future grant or sale under the Plan (unless the Plan
has terminated). However, Shares that have actually been issued under the Plan,
upon exercise of either an Option or Stock Purchase Right, shall not be returned
to the Plan and shall not become available for future distribution under the
Plan, except that if Shares of Restricted Stock are repurchased by the Company
at their original purchase price, such Shares shall become available for future
grant under the Plan.

                                      -3-

<PAGE>

      4.    Administration of the Plan.

            (a)   Administrator. The Plan shall be administered by the Board or
a Committee appointed by the Board, which Committee shall be constituted to
comply with Applicable Laws.

            (b)   Powers of the Administrator. Subject to the provisions of the
Plan and, in the case of a Committee, the specific duties delegated by the Board
to such Committee, and subject to the approval of any relevant authorities, the
Administrator shall have the authority in its discretion:

                  (i)   to determine the Fair Market Value;

                  (ii)  to select the Service Providers to whom Options and
      Stock Purchase Rights may from time to time be granted hereunder;

                  (iii) to determine the number of Shares to be covered by each
      such award granted hereunder;

                  (iv)  to approve forms of agreement for use under the Plan;

                  (v)   to determine the terms and conditions of any Option or
      Stock Purchase Right granted hereunder. Such terms and conditions include,
      but are not limited to, the exercise price, the time or times when Options
      or Stock Purchase Rights may be exercised (which may be based on
      performance criteria), any vesting acceleration or waiver of forfeiture
      restrictions, and any restriction or limitation regarding any Option or
      Stock Purchase Right or the Common Stock relating thereto, based in each
      case on such factors as the Administrator, in its sole discretion, shall
      determine;

                  (vi)  to determine whether and under what circumstances an
      Option may be settled in cash under Section 9(e) instead of Common Stock;

                  (vii) to initiate an Option Exchange Program;

                  (viii) to prescribe, amend and rescind rules and regulations
      relating to the Plan, including rules and regulations relating to
      sub-plans established for the purpose of qualifying for preferred tax
      treatment under foreign tax laws;

                  (ix)  to allow Optionees to satisfy withholding tax
      obligations by electing to have the Company withhold from the Shares to be
      issued upon exercise of an Option or Stock Purchase Right that number of
      Shares having a Fair Market Value equal to the amount required to be
      withheld. The Fair Market Value of the Shares to be withheld shall be
      determined on the date that the amount of tax to be withheld is to be
      determined. All elections by Optionees to have Shares withheld for this
      purpose shall be made in such form and under such conditions as the
      Administrator may deem necessary or advisable; and

                                      -4-

<PAGE>

                  (x)   to construe and interpret the terms of the Plan and
      awards granted pursuant to the Plan.

            (c)   Effect of Administrator's Decision. All decisions,
determinations and interpretations of the Administrator shall be final and
binding on all Optionees.

      5.    Eligibility.

            (a)   Nonstatutory Stock Options and Stock Purchase Rights may be
granted to Service Providers. Incentive Stock Options may be granted only to
Employees.

            (b)   Each Option shall be designated in the Option Agreement as
either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of this
Section 5(b), Incentive Stock Options shall be taken into account in the order
in which they were granted. The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

            (c)   Neither the Plan nor any Option or Stock Purchase Right shall
confer upon any Optionee any right with respect to continuing the Optionee's
relationship as a Service Provider with the Company, nor shall it interfere in
any way with his or her right or the Company's right to terminate such
relationship at any time, with or without cause.

      6.    Term of Plan. The Plan shall become effective upon its adoption by
the Board. It shall continue in effect for a term of 10 years, unless sooner
terminated under Section 14 of the Plan.

      7.    Term of Option. The term of each Option shall be stated in the
applicable Option Agreement; provided, however, that the term shall be no more
than 10 years from the date of grant thereof. In the case of an Incentive Stock
Option granted to an Optionee who, at the time the Option is granted, owns stock
representing more than 10% of the voting power of all classes of stock of the
Company or any Parent or Subsidiary, the term of the Option shall be five years
from the date of grant or such shorter term as may be provided in the Option
Agreement.

      8.    Option Exercise Price and Consideration.

            (a)   The per share exercise price for the Shares to be issued upon
exercise of an Option shall be such price as is determined by the Administrator,
but shall be subject to the following:

                  (i)   In the case of an Incentive Stock Option

                        (A)   granted to an Employee who, at the time of grant
of such Option, owns stock representing more than 10% of the voting power of all
classes of stock of the

                                      -5-

<PAGE>

Company or any Parent or Subsidiary, the exercise price shall be no less than
110% of the Fair Market Value per Share on the date of grant.

                        (B)   granted to any other Employee, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

                  (ii)  In the case of a Nonstatutory Stock Option

                        (A)   granted to a Service Provider who, at the time of
grant of such Option, owns stock representing more than 10% of the voting power
of all classes of stock of the Company or any Parent or Subsidiary, the exercise
price shall be no less than 110% of the Fair Market Value per Share on the date
of grant.

                        (B)   granted to any other Service Provider, the per
Share exercise price shall be no less than 85% of the Fair Market Value per
Share on the date of grant.

                  (iii) Notwithstanding the foregoing, Options may be granted
      with a per Share exercise price other than as required above pursuant to a
      merger or other corporate transaction.

            (b)   The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant). Such consideration may consist of (1) cash,
(2) check, (3) promissory note, (4) other Shares which (x) in the case of Shares
acquired upon exercise of an Option, have been owned by the Optionee for more
than six months on the date of surrender, and (y) have a Fair Market Value on
the date of surrender equal to the aggregate exercise price of the Shares as to
which such Option shall be exercised, (5) consideration received by the Company
under a cashless exercise program implemented by the Company in connection with
the Plan, or (6) any combination of the foregoing methods of payment. In making
its determination as to the type of consideration to accept, the Administrator
shall consider if acceptance of such consideration may be reasonably expected to
benefit the Company.

      9.    Exercise of Option.

            (a)   Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable according to the terms hereof at such
times and under such conditions as determined by the Administrator and set forth
in the Option Agreement. Except in the case of Options granted to Officers,
Directors and Consultants, Options shall become exercisable at a rate of no less
than 20% per year over five years from the date the Options are granted. Unless
the Administrator provides otherwise, vesting of Options granted hereunder shall
be tolled during any unpaid leave of absence. An Option may not be exercised for
a fraction of a Share.

            An Option shall be deemed exercised when the Company receives: (i)
written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is

                                      -6-

<PAGE>

exercised. Full payment may consist of any consideration and method of payment
authorized by the Administrator and permitted by the Option Agreement and the
Plan. Shares issued upon exercise of an Option shall be issued in the name of
the Optionee or, if requested by the Optionee, in the name of the Optionee and
his or her spouse. Until the Shares are issued (as evidenced by the appropriate
entry on the books of the Company or of a duly authorized transfer agent of the
Company), no right to vote or receive dividends or any other rights as a
stockholder shall exist with respect to the Shares, notwithstanding the exercise
of the Option. The Company shall issue (or cause to be issued) such Shares
promptly after the Option is exercised. No adjustment will be made for a
dividend or other right for which the record date is prior to the date the
Shares are issued, except as provided in Section 12 of the Plan.

            Exercise of an Option in any manner shall result in a decrease in
the number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

            (b)   Termination of Relationship as a Service Provider. If an
Optionee ceases to be a Service Provider, such Optionee may exercise his or her
Option within such period of time as is specified in the Option Agreement (of at
least 30 days) to the extent that the Option is vested on the date of
termination (but in no event later than the expiration of the term of the Option
as set forth in the Option Agreement). In the absence of a specified time in the
Option Agreement, the Option shall remain exercisable for three months following
the Optionee's termination. If, on the date of termination, the Optionee is not
vested as to his or her entire Option, the Shares covered by the unvested
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 by the
Administrator, the Option shall terminate, and the Shares covered by such Option
shall revert to the Plan.

            (c)   Disability of Optionee. If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
(of at least six months) to the extent the Option is vested on 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 absence of a specified time
in the Option Agreement, the Option shall remain exercisable for 12 months
following the Optionee's termination. If, on the date of termination, the
Optionee is not vested as to his or her entire Option, the Shares covered by the
unvested 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.

            (d)   Death of Optionee. If an Optionee dies while a Service
Provider, the Option may be exercised within such period of time as is specified
in the Option Agreement (of at least six months) to the extent that the Option
is vested on the date of death (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 acquires the right to exercise the Option by bequest
or inheritance. In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for 12 months following the Optionee's
termination. If, at the time of death, the Optionee is not vested as to the
entire Option, the Shares covered by the unvested portion of the

                                      -7-

<PAGE>

Option shall immediately revert to the Plan. If the Option is not so exercised
within the time specified herein, the Option shall terminate, and the Shares
covered by such Option shall revert to the Plan.

            (e)   Buyout Provisions. The Administrator may at any time offer to
buy out for a payment in cash or Shares, an Option previously granted, based on
such terms and conditions as the Administrator shall establish and communicate
to the Optionee at the time that such offer is made.

      10.   Non-Transferability of Options and Stock Purchase Rights. The
Options and Stock Purchase Rights may not be sold, pledged, assigned,
hypothecated, transferred or disposed of in any manner other than by will or by
the laws of descent or distribution and may be exercised, during the lifetime of
the Optionee, only by the Optionee.

      11.   Stock Purchase Rights.

            (a)   Rights to Purchase. Stock Purchase Rights may be issued either
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing or electronically of the terms, conditions and restrictions
related to the offer, including the number of Shares that such person shall be
entitled to purchase, the price to be paid, and the time within which such
person must accept such offer. The terms of the offer shall comply in all
respects with Section 260.140.42 of Title 10 of the California Code of
Regulations. The offer shall be accepted by execution of a Restricted Stock
Purchase Agreement in the form determined by the Administrator.

            (b)   Repurchase Option. Unless the Administrator determines
otherwise, the Restricted Stock purchase agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's service with the Company for any reason (including death or
disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock purchase agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option shall lapse at such rate as the
Administrator may determine. Except with respect to Shares purchased by
Officers, Directors and Consultants, the repurchase option shall in no case
lapse at a rate of less than 20% per year over five years from the date of
purchase.

            (c)   Other Provisions. The Restricted Stock purchase agreement
shall contain such other terms, provisions and conditions not inconsistent with
the Plan as may be determined by the Administrator in its sole discretion.

            (d)   Rights as a Stockholder. Once the Stock Purchase Right is
exercised, the purchaser shall have rights equivalent to those of a stockholder
and shall be a stockholder when his or her purchase is entered upon the records
of the duly authorized transfer agent of the Company. No adjustment shall be
made for a dividend or other right for which the record date is prior to the
date the Stock Purchase Right is exercised, except as provided in Section 12 of
the Plan.

                                      -8-

<PAGE>

            12.   Adjustments Upon Changes in Capitalization. Merger or Asset
Sale.

                  (a)   Changes in Capitalization. Subject to any required
action by the stockholders of the Company, the number of shares of Common Stock
covered by each outstanding Option or Stock Purchase Right, and the number of
shares of Common Stock which have been authorized for issuance under the Plan
but as to which no Options or Stock Purchase Rights have yet been granted or
which have been returned to the Plan upon cancellation or expiration of an
Option or Stock Purchase Right, as well as the price per share of Common Stock
covered by each such outstanding Option or Stock Purchase Right, shall be
proportionately adjusted for any increase or decrease in the number of issued
shares of Common Stock resulting from a stock split, reverse stock split, stock
dividend, combination or reclassification of the Common Stock, or any other
increase or decrease in the number of issued shares of Common Stock effected
without receipt of consideration by the Company. The conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option or Stock
Purchase Right.

                  (b)   Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option or Stock Purchase Right until 15
days prior to such transaction as to all of the Optioned Stock covered thereby,
including Shares as to which the Option or Stock Purchase Right would not
otherwise be exercisable. In addition, the Administrator may provide that any
Company repurchase option applicable to any Shares purchased upon exercise of an
Option or Stock Purchase Right shall lapse as to all such Shares, provided the
proposed dissolution or liquidation takes place at the time and in the manner
contemplated. To the extent it has not been previously exercised, an Option or
Stock Purchase Right will terminate immediately prior to the consummation of
such proposed action.

                  (c)   Merger or Asset Sale. In the event of a merger of the
Company with or into another corporation, or the sale of substantially all of
the assets of the Company, each outstanding Option and Stock Purchase Right
shall be assumed or an equivalent option or right substituted by the successor
corporation or a Parent or Subsidiary of the successor corporation. In the event
that the successor corporation refuses to assume or substitute for the Option or
Stock Purchase Right, the Optionee shall fully vest in and have the right to
exercise the Option or Stock Purchase Right as to all of the Optioned Stock,
including Shares as to which it would not otherwise be vested or exercisable. If
an Option or Stock Purchase Right becomes fully vested and exercisable in lieu
of assumption or substitution in the event of a merger or sale of assets, the
Administrator shall notify the Optionee in writing or electronically that the
Option or Stock Purchase Right shall be fully exercisable for a period of 15
days from the date of such notice, and the Option or Stock Purchase Right shall
terminate upon the expiration of such period. For the purposes of this
paragraph, the Option or Stock Purchase Right shall be considered assumed if,
following the merger or sale of assets, the option or right confers the right to
purchase or receive,

                                      -9-

<PAGE>

for each Share of Optioned Stock subject to the Option or Stock Purchase Right
immediately prior to the merger or sale of assets, the consideration (whether
stock, cash or other securities or property) received in the merger or sale of
assets by holders of Common Stock for each Share held on the effective date of
the transaction (and if holders were offered a choice of consideration, the type
of consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of
assets is not solely common stock of the successor corporation or its Parent,
the Administrator may, with the consent of the successor corporation, provide
for the consideration to be received upon the exercise of the Option or Stock
Purchase Right, for each Share of Optioned Stock subject to the Option or Stock
Purchase Right, to be solely common stock of the successor corporation or its
Parent equal in fair market value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

      13.   Time of Granting Options and Stock Purchase Rights. The date of
grant of an Option or Stock Purchase Right shall, for all purposes, be the date
on which the Administrator makes the determination granting such Option or Stock
Purchase Right, or such other date as is determined by the Administrator. Notice
of the determination shall be given to each Service Provider to whom an Option
or Stock Purchase Right is so granted within a reasonable time after the date of
such grant.

      14.   Amendment and Termination of the Plan.

            (a)   Amendment and Termination. The Board may at any time amend,
alter, suspend or terminate the Plan.

            (b)   Stockholder Approval. The Board shall obtain stockholder
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

            (c)   Effect of Amendment or Termination. No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options granted under the
Plan prior to the date of such termination.

      15.   Conditions Upon Issuance of Shares.

            (a)   Legal Compliance. Shares shall not be issued pursuant to the
exercise of an Option unless the exercise of such Option and the issuance and
delivery of such Shares shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance.

            (b)   Investment Representations. As a condition to the exercise of
an Option, the Administrator may require the person exercising such Option to
represent and warrant at the time of any such exercise that the Shares are being
purchased only for investment and without

                                      -10-

<PAGE>

any present intention to sell or distribute such Shares if, in the opinion of
counsel for the Company, such a representation is required.

      16.   Inability to Obtain Authority. The inability of the Company to
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

      17.   Reservation of Shares. The Company, during the term of this Plan,
shall at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

      18.   Stockholder Approval. The Plan shall be subject to approval by the
stockholders of the Company within 12 months after the date the Plan is adopted.
Such stockholder approval shall be obtained in the degree and manner required
under Applicable Laws.

      19.   Information to Optionees and Purchasers. The Company shall provide
to each Optionee and to each individual who acquires Shares pursuant to the
Plan, not less frequently than annually during the period such Optionee or
purchaser has one or more Options or Stock Purchase Rights outstanding, and, in
the case of an individual who acquires Shares pursuant to the Plan, during the
period such individual owns such Shares, copies of annual financial statements.
The Company shall not be required to provide such statements to key employees
whose duties in connection with the Company assure their access to equivalent
information.

                                      -11-

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