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                                                                    EXHIBIT 10.6

         CORIXA CORPORATION AMENDED AND RESTATED 1994 STOCK OPTION PLAN

1. PURPOSES OF THE PLAN. The purposes of this Stock Option Plan are to attract
and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to the Employees and Consultants
of the Company and to promote the success of the Company's business.

Options granted hereunder may be either Incentive Stock Options (as defined
under Section 422 of the Code) or Nonstatutory Stock Options, at the discretion
of the Board and as reflected in the terms of the written option agreement.

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

        (a) "Administrator" shall mean the Board or any of its Committees
        appointed pursuant to Section 4 of the Plan.

        (b) "Affiliate" shall mean an entity other than a Subsidiary (as defined
        below) in which the Company owns an equity interest.

        (c) "Applicable Laws" shall have the meaning set forth in Section 4(a)
        below.

        (d) "Board" shall mean the Board of Directors of the Company.

        (e) "Code" shall mean the Internal Revenue Code of 1986, as amended.

        (f) "Committee" shall mean the Committee appointed by the Board of
        Directors in accordance with Section 4(a) of the Plan, if one is
        appointed.

        (g) "Common Stock" shall mean the Common Stock of the Company.

        (h) "Company" shall mean Corixa Corporation, a Delaware corporation.

        (i) "Consultant" means any person, including an advisor, who is engaged
        by the Company or any Parent or Subsidiary to render services and is
        compensated for such services, and any director of the Company whether
        compensated for such services or not.

        (j) "Continuous Status as an Employee or Consultant" shall mean the
        absence of any interruption or termination of service as an Employee or
        Consultant. Continuous Status as an Employee or Consultant shall not be
        considered interrupted in the case of sick leave, military leave, or any
        other leave of absence approved by the Administrator; provided that such
        leave is for a period of not more than 90 days or reemployment upon the
        expiration of such leave is guaranteed by contract or statute. For
        purposes of this Plan, a change in status from an Employee to a
        Consultant or from a Consultant to an Employee will not constitute a
        termination of employment.

        (k) "Director" shall mean a member of the Board.

        (l) "Employee" shall mean any person (including any Named Executive,
        Officer or Director) employed by the Company or any Parent, Subsidiary
        or Affiliate of the Company. The payment by the Company of a director's
        fee to a Director shall not be sufficient to constitute "employment" of
        such Director by the Company.

        (m) "Exchange Act" shall mean the Securities Exchange Act of 1934, as
        amended.

        (n) "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 National Market of the National Association of
                Securities Dealers, Inc. Automated Quotation ("Nasdaq") System,
                its Fair Market Value shall be the closing sales price for such
                stock as quoted on such system on the date of determination (if
                for a given day no sales were reported, the closing bid on that
                day shall be used), as such price is reported in The Wall Street
                Journal or such other source as the Administrator deems
                reliable;

                (ii) If the Common Stock is quoted on the Nasdaq System (but not
                on the National Market thereof) or regularly quoted by a
                recognized securities dealer but selling prices are not
                reported, its Fair Market Value shall be the mean between the
                bid and asked prices for the Common Stock 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.

        (o) "Incentive Stock Option" shall mean an Option intended to qualify as
        an incentive stock option within the meaning of Section 422 of the Code,
        as designated in the applicable written option agreement

        (p) "Named Executive" shall mean any individual who, on the last day of
        the Company's fiscal year, is the chief executive officer of the Company
        (or is acting in such capacity) or among the four highest compensated
        officers of the Company (other than the chief executive officer). Such
        officer status shall be determined pursuant to the executive
        compensation disclosure rules under the Exchange Act.

        (q) "Nonstatutory Stock Option" shall mean an Option not intended to
        qualify as an Incentive Stock
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        Option, as designated in the applicable written option agreement.

        (r) "Officer" shall mean 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.

        (s) "Option" shall mean a stock option granted pursuant to the Plan.

        (t) "Optioned Stock" shall mean the Common Stock subject to an Option.

        (u) "Optionee" shall mean an Employee or Consultant who receives an
        Option.

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

        (w) "Plan" shall mean this Amended and Restated 1994 Stock Option Plan.

        (x) "Rule 16b-3" shall mean Rule 16b-3 promulgated under the Exchange
        Act as the same may be amended from time to time, or any successor
        provision.

        (y) "Share" shall mean a share of the Common Stock, as adjusted in
        accordance with Section 14 of the Plan.

        (z) "Subsidiary" shall mean 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 14 of the
Plan, the maximum aggregate number of shares that may be optioned and sold under
the Plan is 7,852,020 shares of Common Stock (the "Pool"). The Shares may be
authorized, but unissued, or reacquired Common Stock. On the first trading day
of each of the calendar years beginning in 1998 and ending in 1999, the Pool
shall be increased by an amount equal to three (3) percent of the outstanding
Common Stock as of the last trading day of the prior fiscal year up to a maximum
of 500,000 shares in any calendar year. On the first trading day of each of the
calendar years beginning in 2000 and ending in 2004, the Pool shall be increased
by an amount equal to three (3) percent of the outstanding Common Stock as of
the last trading day of the prior fiscal year up to a maximum of 750,000 shares
in any calendar year.

If an Option should expire or become unexercisable for any reason without having
been exercised in full, the unpurchased Shares that were subject thereto shall,
unless the Plan shall have been terminated, become available for future grant
under the Plan. Notwithstanding any other provision of the Plan, shares issued
under the Plan and later repurchased by the Company shall not become available
for future grant under the Plan.

4. ADMINISTRATION OF THE PLAN.

        (a) COMPOSITION OF ADMINISTRATOR.

                (i) MULTIPLE ADMINISTRATIVE BODIES. If permitted by Rule 16b-3,
                and by the legal requirements relating to the administration of
                incentive stock option plans, if any, of applicable securities
                laws and the Code (collectively, the "Applicable Laws"), grants
                under the Plan may (but need not) be made by different
                administrative bodies with respect to Directors, Officers who
                are not directors and Employees who are neither Directors nor
                Officers.

                (ii) ADMINISTRATION WITH RESPECT TO DIRECTORS AND OFFICERS. With
                respect to grants of Options to Employees or Consultants who are
                also Officers or Directors of the Company, grants under the Plan
                shall be made by (A) the Board, if the Board may make grants
                under the Plan in compliance with Rule 16b-3 and Section 162(m)
                of the Code as it applies so as to qualify grants of Options to
                Named Executives as performance-based compensation, or (B) a
                Committee designated by the Board to make grants under the Plan,
                which Committee shall be constituted in such a manner as to
                permit grants under the Plan to comply with Rule 16b-3, to
                qualify grants of Options to Named Executives as
                performance-based compensation under Section 162(m) of the Code
                and otherwise so as to satisfy the Applicable Laws.

                (iii) ADMINISTRATION WITH RESPECT TO OTHER PERSONS. With respect
                to grants of Options to Employees or Consultants who are neither
                Directors nor Officers of the Company, the Plan shall be
                administered by (A) the Board or (B) a Committee designated by
                the Board, which Committee shall be constituted in such a manner
                as to satisfy the Applicable Laws.

                (iv) GENERAL. If a Committee has been appointed pursuant to
                subsection (ii) or (iii) of this Section 4(a), such Committee
                shall continue to serve in its designated capacity until
                otherwise directed by the Board. From time to time the Board may
                increase the size of any Committee and appoint additional
                members thereof, remove members (with or without cause) and
                appoint new members in substitution therefor, fill vacancies
                (however caused) and remove all members of a Committee and
                thereafter directly administer the Plan, all to the extent
                permitted by the Applicable Laws and, in the case of a Committee
                appointed under subsection (ii), to the extent permitted by Rule
                16b-3, and to the extent required under Section 162(m) of the
                Code to qualify grants of Options to Named Executives as
                performance-based compensation.

        (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, the Administrator shall have the authority, in
        its discretion:

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                (i) to determine the Fair Market Value of the Common Stock, in
                accordance with Section 2(m) of the Plan;

                (ii) to select the Employees and Consultants to whom Options may
                from time to time be granted hereunder;

                (iii) to determine whether and to what extent Options are
                granted hereunder;

                (iv) to determine the number of shares of Common Stock to be
                covered by each such award granted hereunder;

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

                (vi) to determine the terms and conditions, not inconsistent
                with the terms of the Plan, of any award granted hereunder
                (including, but not limited to, the share price and any
                restriction or limitation, or any vesting acceleration or waiver
                of forfeiture restrictions regarding any Option and/or the
                shares of Common Stock relating thereto, based in each case on
                such factors as the Administrator shall determine, in its sole
                discretion); and

                (vii) to reduce the exercise price of any Option to the then
                current Fair Market Value if the Fair Market Value of the Common
                Stock covered by such Option shall have declined since the date
                the Option was granted.

        (c) EFFECT OF ADMINISTRATOR'S DECISION. All decisions, determinations
        and interpretations of the Administrator shall be final and binding on
        all Optionees and any other holders of any Options.

5. ELIGIBILITY.

        (a) RECIPIENTS OF GRANTS. Nonstatutory Stock Options may be granted to
        Employees and Consultants. Incentive Stock Options may be granted only
        to Employees, provided, however, that Employees of an Affiliate shall
        not be eligible to receive Incentive Stock Options. An Employee or
        Consultant who has been granted an Option may, if he or she is otherwise
        eligible, be granted an additional Option or Options.

        (b) TYPE OF OPTION. Each Option shall be designated in the written
        option agreement as either an Incentive Stock Option or a Nonstatutory
        Stock Option. However, notwithstanding such designations, to the extent
        that the aggregate Fair Market Value of Shares with respect to which
        Incentive Stock Options are exercisable for the first time by an
        Optionee during any calendar year (under all plans of the Company or any
        Parent or Subsidiary) exceeds $100,000, such excess 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, and the Fair Market Value of the Shares
        shall be determined as of the time the Option with respect to such
        Shares is granted.

        (c) NO EMPLOYMENT RIGHTS. The Plan shall not confer upon any Optionee
        any right with respect to continuation of employment or consulting
        relationship with the Company, nor shall it interfere in any way with
        his or her right or the Company's right to terminate his or her
        employment or consulting relationship at any time, with or without
        cause.

6. TERM OF PLAN. The Plan shall become effective (the "Effective Date") upon the
earlier to occur of its adoption by the Board or its approval by the
stockholders of the Company as described in Section 20 of the Plan. It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 16 of the Plan.

7. TERM OF OPTION. The term of each Option shall be the term stated in the
Option Agreement; provided, however, that in the case of an Incentive Stock
Option, the term shall be no more than ten (10) years from the date of grant
thereof or such shorter term as may be provided in the Option Agreement.
However, in the case of an Option granted to an Optionee who, at the time the
Option is granted, owns stock representing more than ten percent (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 (5) years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement.

8. LIMITATION ON GRANTS TO EMPLOYEES. Subject to adjustment as provided in this
Plan, the maximum number of Shares which may be subject to options granted to
any one Employee under this Plan for any fiscal year of the Company shall be
500,000.

9. OPTION EXERCISE PRICE AND CONSIDERATION.

        (a) EXERCISE PRICE. The per Share exercise price for the Shares to be
        issued pursuant to 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 the grant of
                    such Incentive Stock Option, owns stock representing more
                    than ten percent (10%) of the voting power of all classes of
                    stock of the Company or any Parent or Subsidiary, the per
                    Share exercise price shall be no less than 110% of the Fair
                    Market Value per Share on the date of grant; or

                    (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 person who, at the time of the grant of
                    such Option, is a Named Executive of the Company, the per
                    share Exercise Price shall

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                    be no less than 100% of the Fair Market Value on the date of
                    grant; or

                    (B) granted to any person other than a Named Executive, 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 anything to the contrary in subsections
                9(a)(i) or 9(a)(ii) above, in the case of an Option granted on
                or after the effective date of registration of any class of
                equity security of the Company pursuant to Section 12 of the
                Exchange Act and prior to six months after the termination of
                such registration, the per Share exercise price shall be no less
                than 100% of the Fair Market Value per Share on the date of
                grant.

        (b) PERMISSIBLE CONSIDERATION. 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) and
        may consist entirely of (1) cash, (2) check, (3) other Shares that (x)
        in the case of Shares acquired upon exercise of an Option either have
        been owned by the Optionee for more than six months on the date of
        surrender or were not acquired, directly or indirectly, from the
        Company, and (y) have a Fair Market Value on the date of surrender equal
        to the aggregate exercise price of the Shares as to which said Option
        shall be exercised, (4) delivery of a properly executed exercise notice
        together with irrevocable instructions to a broker to deliver promptly
        to the Company the amount of sale or loan proceeds required to pay the
        exercise price, (5) a combination of any of the foregoing methods of
        payment, (6) in the discretion of the Administrator, a combination of
        any of the foregoing methods of payment at least equal in value to the
        stated capital represented by the Shares to be issued, plus a promissory
        note for the balance of the exercise price on such terms as established
        by the Administrator, or (7) such other consideration and method of
        payment for the issuance of Shares to the extent permitted under
        Applicable Laws. 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.

10. EXERCISE OF OPTION.

        (a) PROCEDURE FOR EXERCISE; RIGHTS AS A STOCKHOLDER. Any Option granted
        hereunder shall be exercisable at such times and under such conditions
        as determined by the Administrator, including performance criteria with
        respect to the Company and/or the Optionee, and as shall be permissible
        under the terms of the Plan.

        An Option may not be exercised for a fraction of a Share.

        An Option shall be deemed to be exercised when written notice of such
        exercise has been given to the Company in accordance with the terms of
        the Option by the person entitled to exercise the Option and full
        payment for the Shares with respect to which the Option is exercised has
        been received by the Company. Full payment may, as authorized by the
        Administrator, consist of any consideration and method of payment
        allowable under Section 9(b) of the Plan. Until the issuance (as
        evidenced by the appropriate entry on the books of the Company or of a
        duly authorized transfer agent of the Company) of the stock certificate
        evidencing such Shares, no right to vote or receive dividends or any
        other rights as a stockholder shall exist with respect to the Optioned
        Stock, notwithstanding the exercise of the Option. The Company shall
        issue (or cause to be issued) such stock certificate promptly upon
        exercise of the Option. No adjustment will be made for a dividend or
        other right for which the record date is prior to the date the stock
        certificate is issued, except as provided in Section 14 of the Plan.

        Exercise of an Option in any manner shall result in a decrease in the
        number of Shares which thereafter may be 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 STATUS AS AN EMPLOYEE OR CONSULTANT. In the event of
        termination of an Optionee's Continuous Status as an Employee or
        Consultant, such Optionee may, but only within thirty (30) days (or such
        other period of time, not exceeding three (3) months in the case of an
        Incentive Stock Option or six (6) months in the case of a Nonstatutory
        Stock Option, as is determined by the Administrator, with such
        determination in the case of an Incentive Stock Option being made at the
        time of grant of the Option) after the date of such termination (but in
        no event later than the date of expiration of the term of such Option as
        set forth in the Option Agreement), exercise his or her Option to the
        extent that he or she was entitled to exercise it at the date of such
        termination. To the extent that the Optionee was not entitled to
        exercise the Option at the date of such termination, or if the optionee
        does not exercise such Option (which he or she was entitled to exercise)
        within the time specified herein, the Option shall terminate.

        (c) DISABILITY OF OPTIONEE. Notwithstanding Section 10(b) above, in the
        event of termination of an Optionee's Continuous Status as an Employee
        or Consultant as a result of his or her total and permanent disability
        (as defined in Section 22(e)(3) of the Code), he or she may, but only
        within six (6) months (or such other period of time not exceeding twelve
        (12) months as is determined by the Administrator, with such
        determination in the case of an Incentive Stock Option being made at the
        time of grant of the Option) from the date of such termination (but in
        no event later than the date of expiration of the term of such Option as
        set forth in the Option Agreement), exercise his or her Option to the
        extent he or she was entitled to exercise it at the date of such
        termination. To the extent that he or she was not entitled to exercise
        the Option at the date of termination, or if he does not exercise such

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         Option (which he was entitled to exercise) within the time specified
         herein, the Option shall terminate.

        (d) DEATH OF OPTIONEE. In the event of the death of an Optionee:

                (i) during the term of the Option who is at the time of his
                death an Employee or Consultant of the Company and who shall
                have been in Continuous Status as an Employee or Consultant
                since the date of grant of the Option, the Option may be
                exercised, at any time within six (6) months (or such other
                period of time, not exceeding twelve (12) months, as is
                determined by the Administrator, with such determination in the
                case of an Incentive Stock Option being made at the time of
                grant of the Option) following the date of death (but in no
                event later than the date of 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 of the
                right to exercise that would have accrued had the Optionee
                continued living and remained in Continuous Status as an
                Employee or Consultant three (3) months (or such other period of
                time as is determined by the Administrator as provided above)
                after the date of death, subject to the limitation set forth in
                Section 5(b); or

                (ii) within thirty (30) days (or such other period of time not
                exceeding three (3) months as is determined by the
                Administrator, with such determination in the case of an
                Incentive Stock Option being made at the time of grant of the
                Option) after the termination of Continuous Status as an
                Employee or Consultant, the Option may be exercised, at any time
                within six (6) months following the date of death (but in no
                event later than the date of 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 of the
                right to exercise that had accrued at the date of termination.

        (e) RULE 16B-3. Options granted to persons subject to Section 16(b) of
        the Exchange Act must comply with Rule 16b-3 and shall contain such
        additional conditions or restrictions as may be required thereunder to
        qualify for the maximum exemption from Section 16 of the Exchange Act
        with respect to Plan transactions.

        (f) UNVESTED SHARES. The Administrator shall have the discretion to
        authorize the issuance of unvested shares of Common Stock under the
        Plan. Should the optionee cease to be in Continuous Status as an
        Employee or Consultant while holding such unvested shares, the Company
        shall have the right to repurchase, at the exercise price paid per
        share, all or (at the discretion of the Company and with the consent of
        the optionee) any of those unvested shares. The terms and conditions
        upon which such repurchase right shall be exercisable (including the
        period and procedure for exercise and the appropriate vesting schedule
        for the purchased shares) shall be established by the Administrator and
        set forth in the agreement evidencing such repurchase right. In no
        event, however, may the Administrator impose a vesting schedule upon any
        option granted under the Plan or any shares of Common Stock subject to
        the option which is more restrictive than twenty percent (20%) per year
        vesting, beginning one (1) year after the grant date. All outstanding
        repurchase rights under the Plan shall terminate automatically upon the
        occurrence of a corporate transaction as discussed in Section 14(b),
        except to the extent the repurchase rights are expressly assigned to the
        successor corporation (or parent thereof) in connection with such
        corporate transaction.

        (g) FIRST REFUSAL RIGHTS. Until such time as the Company's outstanding
        shares of Common Stock are first registered under Section 12(g) of the
        Exchange Act, the Company shall have the right of first refusal with
        respect to any proposed sale or other disposition by the optionee (or
        any successor in interest by reason of purchase, gift or other transfer)
        of any shares of Common Stock issued under the Plan. Such right of first
        refusal shall be exercisable in accordance with the terms and conditions
        established by the Administrator and set forth in the agreement
        evidencing such right.

11. WITHHOLDING TAXES. As a condition to the exercise of Options granted
hereunder, the Optionee shall make such arrangements as the Administrator may
require for the satisfaction of any federal, state, local or foreign withholding
tax obligations that may arise in connection with the exercise, receipt or
vesting of such Option. The Company shall not be required to issue any Shares
under the Plan until such obligations are satisfied.

12. STOCK WITHHOLDING TO SATISFY WITHHOLDING TAX OBLIGATIONS. At the discretion
of the Administrator, Optionees may satisfy withholding obligations as provided
in this paragraph. If the Administrator allows the withholding or surrender of
Shares to satisfy an Optionee's tax withholding obligations under this Section
12, the Administrator shall not allow Shares to be withheld in an amount that
exceeds the minimum statutory withholding rates for federal and state tax
purposes, including payroll taxes. When an Optionee incurs tax liability in
connection with an Option which tax liability is subject to tax withholding
under applicable tax laws, and the Optionee is obligated to pay the Company an
amount required to be withheld under applicable tax laws, the Optionee may
satisfy the withholding tax obligation by one or some combination of the
following methods: (a) by cash payment, or (b) out of Optionee's current
compensation, or (c) if permitted by the Administrator, in its discretion, by
surrendering to the Company Shares that (i) in the case of Shares previously
acquired from the Company, have been owned by the Optionee for more than six
months on the date of surrender, and (ii) have a fair market value on the date
of surrender equal to or less than the amount required to be withheld, or (d) by
electing to have the Company withhold from the Shares to be issued upon exercise
of the Option that number of Shares

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having a fair market value equal to the amount required to be withheld. For
this purpose, 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
(the "Tax Date").

Any surrender by an Officer or Director of previously owned Shares to satisfy
tax withholding obligations arising upon exercise of this Option must comply
with the applicable provisions of Rule 16b-3.

All elections by an Optionee to have Shares withheld to satisfy tax withholding
obligations shall be made in writing in a form acceptable to the Administrator
and shall be subject to the following restrictions:

        (a) the election must be made on or prior to the applicable Tax Date;

        (b) once made, the election shall be irrevocable as to the particular
        Shares of the Option as to which the election is made; and

        (c) all elections shall be subject to the consent or disapproval of the
        Administrator.

In the event the election to have Shares withheld is made by an Optionee and the
Tax Date is deferred under Section 83 of the Code because no election is filed
under Section 83(b) of the Code, the Optionee shall receive the full number of
Shares with respect to which the Option is exercised but such Optionee shall be
unconditionally obligated to tender back to the Company the proper number of
Shares on the Tax Date.

13. NON-TRANSFERABILITY OF OPTIONS. The Option 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; provided that the Administrator
may in its discretion grant transferable Nonstatutory Stock Options pursuant to
option agreements specifying (i) the manner in which such Nonstatutory Stock
Options are transferable and (ii) that any such transfer shall be subject to the
Applicable Laws. The designation of a beneficiary by an Optionee will not
constitute a transfer. An Option may be exercised, during the lifetime of the
Optionee, only by the Optionee or a transferee permitted by this Section 13.

14. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION; CORPORATE TRANSACTIONS.

        (a) ADJUSTMENT. Subject to any required action by the stockholders of
        the Company, the number of shares of Common Stock covered by each
        outstanding Option, the number of shares of Common Stock that have been
        authorized for issuance under the Plan but as to which no Options have
        yet been granted or which have been returned to the Plan upon
        cancellation or expiration of an Option, the maximum number of shares of
        Common Stock for which Options may be granted to any employee under
        Section 8 of the Plan, and the price per share of Common Stock covered
        by each such outstanding Option, 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; provided,
        however, that 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 Administrator,
        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.

        (b) CORPORATE TRANSACTIONS. In the event of the proposed dissolution or
        liquidation of the Company, the Option will terminate immediately prior
        to the consummation of such proposed action, unless otherwise provided
        by the Administrator. The Administrator may, in the exercise of its sole
        discretion in such instances, declare that any Option shall terminate as
        of a date fixed by the Administrator and give each Optionee the right to
        exercise his or her Option as to all or any part of the Optioned Stock,
        including Shares as to which the Option would not otherwise be
        exercisable. In the event of a proposed sale of all or substantially all
        of the assets of the Company, or the merger of the Company with or into
        another corporation, (i) if the Option is assumed or an equivalent
        option is substituted by such successor corporation or a parent or
        subsidiary of such successor corporation, one half of the unvested
        portion of the Option shall be deemed to have vested immediately prior
        to such sale or merger, (ii) if the Option is not assumed or an
        equivalent option is not substituted by such successor corporation or a
        parent or subsidiary of such successor corporation, all of the unvested
        portion of the Option shall be deemed to have vested immediately prior
        to such sale or merger and (iii) if an executive officer of the Company
        is terminated without cause within six-months following the consummation
        of such sale or merger, the entire unvested portion of the Options held
        by such executive officer shall be deemed to have vested and become
        fully exercisable immediately prior to any such termination. The
        Administrator may determine, in the exercise of its sole discretion and
        in lieu of such assumption or substitution, that the Optionee shall have
        the right to exercise the Option as to some or all of the Optioned
        Stock, including Shares as to which the Option would not otherwise be
        exercisable. If the vesting of the Option is accelerated pursuant to
        this Section 14(b), the Administrator shall notify the Optionee that the
        vesting of the Option has been accelerated and Optionee shall have the
        right to exercise the Option prior to such sale or merger.

15. TIME OF GRANTING OPTIONS. The date of grant of an Option shall, for all
purposes, be the date on which the Administrator makes the determination
granting such Option or such other date as is determined by the Administrator;
provided however that in the case of any Incentive Stock Option, the grant date
shall be the later of the date on which the Administrator makes the
determination granting such Incentive Stock Option or the date of commencement
of the Optionee's employment relationship with the Company. Notice of the
determination shall

                                      -6-
<PAGE>   7
be given to each Employee or Consultant to whom an Option is so granted within a
reasonable time after the date of such grant.

16. AMENDMENT AND TERMINATION OF THE PLAN.

        (a) AMENDMENT AND TERMINATION. The Board may amend or terminate the Plan
        from time to time in such respects as the Board may deem advisable;
        provided that, the following revisions or amendments shall require
        approval of the stockholders of the Company in the manner described in
        Section 20 of the Plan:

                (i) any increase in the number of Shares subject to the Plan,
                other than an adjustment under Section 14 of the Plan;

                (ii) any change in the designation of the class of persons
                eligible to be granted Options; or

                (iii) any change in the limitation on grants to employees as
                described in Section 8 of the Plan or other changes which would
                require stockholder approval to qualify options granted
                hereunder as performance-based compensation under Section 162(m)
                of the Code.

        (b) STOCKHOLDER APPROVAL. If any amendment requiring stockholder
        approval under Section 16(a) of the Plan is made subsequent to the first
        registration of any class of equity securities by the Company under
        Section 12 of the Exchange Act, such stockholder approval shall be
        solicited as described in Section 20 of the Plan.

        (c) EFFECT OF AMENDMENT OR TERMINATION. Any such amendment or
        termination of the Plan shall not affect Options already granted and
        such Options shall remain in full force and effect as if this Plan had
        not been amended or terminated, unless mutually agreed otherwise between
        the Optionee and the Board, which agreement must be in writing and
        signed by the Optionee and the Company.

17. CONDITIONS UPON ISSUANCE OF SHARES. 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 pursuant thereto shall comply with all relevant
provisions of law, including, without limitation, the Securities Act of 1933, as
amended, the Exchange Act, the rules and regulations promulgated thereunder, and
the requirements of any stock exchange upon which the Shares may then be listed,
and shall be further subject to the approval of counsel for the Company with
respect to such compliance.

As a condition to the exercise of an Option, the Company 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 by any of the aforementioned
relevant provisions of law.

18. RESERVATION OF SHARES. The Company, during the term of this Plan, will at
all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan. 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.

19. OPTION AGREEMENT. Options shall be evidenced by written option agreements in
such form as the Board shall approve.

20. STOCKHOLDER APPROVAL.

        (a) Continuance of the Plan shall be subject to approval by the
        stockholders of the Company within twelve (12) months before or after
        the date the Plan is adopted. Such stockholder approval shall be
        obtained in the manner and to the degree required under applicable
        federal and state law and the rules of any stock exchange upon which the
        Shares are listed.

        (b) In the event that the Company registers any class of equity
        securities pursuant to Section 12 of the Exchange Act, any required
        approval of the stockholders of the Company obtained after such
        registration shall be solicited substantially in accordance with Section
        14(a) of the Exchange Act and the rules and regulations promulgated
        thereunder.

        (c) If any required approval by the stockholders amendment thereto is
        solicited at any time otherwise than in the manner described in Section
        20(b) hereof, then the Company shall, at or prior to the first annual
        meeting of stockholders held subsequent to the later of (1) the first
        registration of any class of equity securities of the Company under
        Section 12 of the Exchange Act or (2) the granting of an Option
        hereunder to an officer or director after such registration, do the
        following:

        (i) furnish in writing to the holders entitled to vote for the Plan
        substantially the same information that would be required (if proxies to
        be voted with respect to approval or disapproval of the Plan or
        amendment were then being solicited) by the rules and regulations in
        effect under Section 14(a) of the Exchange Act at the time such
        information is furnished; and

        (ii) file with, or mail for filing to, the Securities and Exchange
        Commission four copies of the written information referred to in
        subsection (i) hereof not later than the date on which such information
        is first sent or given to stockholders.

21. FINANCIAL REPORTS.

        The Company shall deliver a balance sheet and an income statements at
least annually to each individual holding an outstanding option under the Plan,
unless such individual is a key employee whose duties in connection with the
Company assure such individual access to equivalent information.

                                      -7-Exhibit 4.1

                            SAMPLE STOCK CERTIFICATE

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

MONTANA ACQUISITION CORPORATION

AUTHORIZED CAPITAL STOCK 50,000, PAR VALUE $.001 PER SHARE

THIS CERTIFIES THAT is the owner of fully paid and  nonassessable  shares of the
Capital Stock of the above named  Corporation  transferable only on the books of
the  Corporation by the holder hereof in person or by duly  authorized  Attorney
upon surrender of this Certificate properly endorsed.

IT WITNESS  WHEREOF,  the said  Corporation  has caused this  Certificate  to be
signed by its duly  authorized  officers and its  Corporate  Seal to be hereunto
affixed this ___ day of ____, 2000.

--------------------------
Secretary

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