Document:

<PAGE>

                                                                    EXHIBIT 4.10

THE WARRANT EVIDENCED OR CONSTITUTED HEREBY, AND ALL SHARES OF COMMON STOCK
ISSUABLE HEREUNDER, HAVE BEEN AND WILL BE ISSUED WITHOUT REGISTRATION UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") AND MAY NOT BE SOLD,
OFFERED FOR SALE, TRANSFERRED, PLEDGED OR HYPOTHECATED WITHOUT REGISTRATION
UNDER THE ACT UNLESS EITHER (i) THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL,
IN FORM AND SUBSTANCE REASONABLY SATISFACTORY TO THE COMPANY, TO THE EFFECT THAT
REGISTRATION IS NOT REQUIRED IN CONNECTION WITH SUCH DISPOSITION OR (ii) THE
SALE OF SUCH SECURITIES IS MADE PURSUANT TO SEC RULE 144.

                       WARRANT TO PURCHASE COMMON STOCK
                                      OF
                         BIOSOURCE INTERNATIONAL, INC.

NO.                                                            February __, 2000

THIS CERTIFIES THAT, for value received by BioSource International, Inc., a
Delaware corporation (the "Company"), Stargen II LLC, or its permitted
                           -------
registered assigns ("Holder"), is entitled, subject to the terms and conditions
                     ------
of this Warrant, at any time or from time to time after the issuance date of
this Warrant (the "Effective Date"), and before 5:00 p.m. Pacific Time on the
                   --------------
fifth (5th) anniversary of the Effective Date (the "Expiration Date"), to
                                                    ---------------
purchase from the Company 24,458 shares of Common Stock of the Company, at a
price per share of $7.77 (the "Purchase Price").  Both the number of shares of
                               --------------
Common Stock purchasable upon exercise of this Warrant and the Purchase Price
are subject to adjustment and change as provided herein.

     1.  CERTAIN DEFINITIONS. As used in this Warrant the following terms shall
have the following respective meanings:

         1.1  "Fair Market Value" of a share of Common Stock as of a particular
              -------------------
date shall mean:

              (a)  If traded on a securities exchange or the Nasdaq National
Market, the Fair Market Value shall be deemed to be the average of the closing
prices of the Common Stock of the Company on such exchange or market over the
five (5) trading days ending immediately prior to the applicable date of
valuation;

              (b)  If actively traded over-the-counter, the Fair Market Value
shall be deemed to be the average of the closing bid prices over the thirty
(30)-day period ending immediately prior to the applicable date of valuation;
and

              (c)  If there is no active public market, the Fair Market Value
shall be the value thereof, as agreed upon by the Company and the Holder;
provided, however, that if the Company and the Holder cannot agree on such
value, such value shall be determined by an independent valuation firm
experienced in valuing businesses such as the Company and jointly selected in
good faith by the Company and the Holder. Fees and expenses of the valuation
firm shall be paid for by the Company.
<PAGE>

         1.2   "Registered Holder" shall mean any Holder in whose name this
                -----------------
Warrant is registered upon the books and records maintained by the Company.

         1.3   "Warrant" as used herein, shall include this Warrant and any
                -------
warrant delivered in substitution or exchange therefor as provided herein .

         1.4   "Common Stock" shall mean the Common Stock of the Company and any
                ------------
other securities at any time receivable or issuable upon exercise of this
Warrant.

     2.  EXERCISE OF WARRANT.

         2.1  Payment. Subject to compliance with the terms and conditions of
              -------
this Warrant and applicable securities laws, this Warrant may be exercised, in
whole or in part at any time or from time to time, on or before the Expiration
Date by the delivery (including, without limitation, delivery by facsimile) of
the form of Notice of Exercise attached hereto as Exhibit A (the "Notice of
                                                  ---------      -------
Exercise"), duly executed by the Holder, at the principal office of the Company,
--------
and as soon as practicable after such date, surrendering

              (a)  this Warrant at the principal office of the Company, and

              (b)  payment, (i) in cash (by check) or by wire transfer, (ii) by
cancellation by the Holder of indebtedness of the Company to the Holder; or
(iii) by a combination of (i) and (ii), of an amount equal to the product
obtained by multiplying the number of shares of Common Stock being purchased
upon such exercise by the then effective Purchase Price (the "Exercise Amount").
                                                              ---------------

         2.2  Net Issue Exercise. In lieu of the payment methods set forth in
              ------------------
Section 2.1(b) above, the Holder may elect to exchange all or some of this
Warrant for shares of Common Stock equal to the value of the amount of the
Warrant being exchanged on the date of exchange. If Holder elects to exchange
this Warrant as provided in this Section 2.2, Holder shall tender to the Company
                                 -----------
the Warrant for the amount being exchanged, along with written notice of
Holder's election to exchange some or all of the Warrant, and the Company shall
issue to Holder the number of shares of the Common Stock computed using the
following formula:

                  X =  Y (A-B)
                      ---------
                          A

          Where:   X =  the number of shares of Common Stock to be issued to
                        Holder.

                   Y =  the number of shares of Common Stock purchasable under
                        the amount of the Warrant being exchanged (as adjusted
                        to the date of such calculation).

                   A =  the Fair Market Value of one share of the Common Stock.

                   B =  Purchase Price (as adjusted to the date of such
                        calculation).

         2.3  "Easy Sale" Exercise. In lieu of the payment methods set forth in
              --------------------
Sections 2.1(b) and 2.2, above, when permitted by law and applicable regulations
-----------------------
(including Nasdaq and NASD rules), the Holder may pay the Purchase Price through
a "same day sale" commitment from the Holder (and if applicable a broker-dealer
that is a member of the National Association of

                                       2
<PAGE>

Securities Dealers (an "NASD Dealer")), whereby the Holder irrevocably elects to
                        -----------
exercise this Warrant and to sell a portion of the shares so purchased to pay
the Purchase Price and the Holder (or, if applicable, the NASD Dealer) commits
upon sale (or, in the case of the NASD Dealer, upon receipt) of such shares to
forward the Purchase Price directly to the Company.

         2.4  Stock Certificates; Fractional Shares. As soon as practicable on
              -------------------------------------
or after the date of any exercise of this Warrant, the Company shall issue and
deliver to the person or persons entitled to receive the same a certificate or
certificates for the number of whole shares of Common Stock issuable upon such
exercise, together with cash in lieu of any fraction of a share equal to such
fraction of the current Fair Market Value of one whole share of Common Stock as
of such date of exercise. No fractional shares or scrip representing fractional
shares shall be issued upon an exercise of this Warrant.

         2.5  Partial Exercise; Effective Date of Exercise. In case of any
              --------------------------------------------
partial exercise of this Warrant, the Company shall cancel this Warrant upon
surrender hereof and shall execute and deliver a new Warrant of like tenor and
date for the balance of the shares of Common Stock purchasable hereunder. This
Warrant shall be deemed to have been exercised immediately prior to the close of
business on the date of its surrender for exercise as provided above. The person
entitled to receive the shares of Common Stock issuable upon exercise of this
Warrant shall be treated for all purposes as the holder of record of such shares
as of the close of business on the date the Holder is deemed to have exercised
this Warrant.

         2.6  Vesting. This Warrant shall vest fully upon issuance.
              -------

     3.  VALID ISSUANCE: TAXES. All shares of Common Stock issued upon the
exercise of this Warrant shall be validly issued, fully paid and non-assessable,
and the Company shall pay all taxes and other governmental charges that may be
imposed in respect of the issue or delivery thereof. The Company shall not be
required to pay any tax or other charge imposed in connection with any transfer
involved in the issuance of any certificate for shares of Common Stock in any
name other than that of the Registered Holder of this Warrant, and in such case
the Company shall not be required to issue or deliver any stock certificate or
security until such tax or other charge has been paid, or it has been
established to the Company's reasonable satisfaction that no tax or other charge
is due.

     4.  ADJUSTMENT OF PURCHASE PRICE AND NUMBER OF SHARES. The number of shares
of Common Stock issuable upon exercise of this Warrant (or any shares of stock
or other securities or property receivable or issuable upon exercise of this
Warrant) and the Purchase Price are subject to adjustment upon occurrence of the
following events:

         4.1  Adjustment for Stock Splits, Stock Subdivisions or Combinations of
              ------------------------------------------------------------------
Shares. The Purchase Price of this Warrant shall be proportionally decreased and
------
the number of shares of Common Stock issuable upon exercise of this Warrant (or
any shares of stock or other securities at the time issuable upon exercise of
this Warrant) shall be proportionally increased to reflect any stock split or
subdivision of the Company's Common Stock. The Purchase Price of this Warrant
shall be proportionally increased and the number of shares of Common Stock
issuable upon exercise of this Warrant (or any shares of stock or other
securities at the time issuable upon exercise of this Warrant) shall be
proportionally decreased to reflect any combination of the Company's Common
Stock.

                                       3
<PAGE>

         4.2  Adjustment for Dividends or Distributions of Stock or Other
              -----------------------------------------------------------
Securities or Property. In case the Company shall make or issue, or shall fix a
----------------------
record date for the determination of eligible holders entitled to receive, a
dividend or other distribution with respect to the Common Stock (or any shares
of stock or other securities at the time issuable upon exercise of the Warrant)
payable in (a) securities of the Company or (b) assets or (c) cash dividends
paid or payable solely out of retained earnings, but only if such cash dividends
are Extraordinary Dividends (as defined below), then, in each such case, the
Holder of this Warrant on exercise hereof at any time after the consummation,
effective date or record date of such dividend or other distribution, shall
receive, in addition to the shares of Common Stock (or such other stock or
securities) issuable on such exercise prior to such date, and without the
payment of additional consideration therefor, the securities, assets or cash to
which such Holder would have been entitled upon such date if such Holder had
exercised this Warrant on the date hereof and had thereafter, during the period
from the date hereof to and including the date of such exercise, retained such
shares and all such additional securities, assets or cash distributed with
respect to such shares as aforesaid during such period giving effect to all
adjustments called for by this Section 4. "Extraordinary Dividends" shall mean
                               ---------
dividends or distributions declared with respect to the Common Stock that are in
an amount greater than 3% of the aggregate Fair Market Value of the shares of
capital stock receiving such dividends as of the trading day prior to the
declaration of such dividends or distributions.

         4.3  Reclassification. If the Company, by reclassification of
              ----------------
securities or otherwise, shall change any of the securities as to which purchase
rights under this Warrant exist into the same or a different number of
securities of any other class or classes, this Warrant shall thereafter
represent the right to acquire such number and kind of securities as would have
been issuable as the result of such change with respect to the securities that
were subject to the purchase rights under this Warrant immediately prior to such
reclassification or other change, and the Purchase Price therefor shall be
appropriately adjusted, all subject to further adjustment as provided in this
Section 4. No adjustment shall be made pursuant to this Section 4.3 upon any
---------                                               -----------
conversion or redemption of the Common Stock which is the subject of Section
                                                                     -------
4.5.
---

         4.4  Adjustment for Capital Reorganization, Merger or Consolidation. In
              --------------------------------------------------------------
case of any capital reorganization of the capital stock of the Company (other
than a combination, reclassification, exchange or subdivision of shares
otherwise provided for herein), or any merger or consolidation of the Company
with or into another corporation, or the sale of all or substantially all the
assets of the Company then, and in each such case, as a part of such
reorganization, merger, consolidation, sale or transfer, lawful provision shall
be made so that the Holder of this Warrant shall thereafter be entitled to
receive upon exercise of this Warrant, during the period specified herein and
upon payment of the Purchase Price then in effect, the number of shares of stock
or other securities or property of the successor corporation resulting from such
reorganization, merger, consolidation, sale or transfer that a holder of the
shares deliverable upon exercise of this Warrant would have been entitled to
receive in such reorganization, consolidation, merger, sale or transfer if this
Warrant had been exercised immediately before such reorganization, merger,
consolidation, sale or transfer, all subject to further adjustment as provided
in this Section 4. The foregoing provisions of this Section 4.4 shall similarly
        ---------                                   -----------
apply to successive reorganizations, consolidations, mergers, sales and
transfers and to the stock or securities of any other corporation that are at
the time receivable upon the exercise of this Warrant. If the per-share
consideration payable to the Holder hereof for shares in connection with any
such transaction is in a form other than cash or marketable securities, then the
value of such consideration shall be determined in good faith by the Company's
Board of Directors. In all events, appropriate adjustment (as determined in good
faith by the Company's Board of Directors) shall be made in the application of
the provisions of this Warrant with respect

                                       4
<PAGE>

to the rights and interests of the Holder after the transaction, to the end that
the provisions of this Warrant shall be applicable after that event, as near as
reasonably may be, in relation to any shares or other property deliverable after
that event upon exercise of this Warrant.

         4.5  Conversion of Common Stock. In case all or any portion of the
              --------------------------
authorized and outstanding shares of Common Stock of the Company are redeemed or
converted or reclassified into other securities or property pursuant to the
Company's Certificate of Incorporation or otherwise, or the Common Stock
otherwise ceases to exist, then, in such case, the Holder of this Warrant, upon
exercise hereof at any time after the date on which the Common Stock is so
redeemed or converted, reclassified or ceases to exist (the "Termination Date"),
                                                             ----------------
shall receive, in lieu of the number of shares of Common Stock that would have
been issuable upon such exercise immediately prior to the Termination Date, the
securities or property that would have been received if this Warrant had been
exercised in full and the Common Stock received thereupon had been
simultaneously converted immediately prior to the Termination Date, all subject
to further adjustment as provided in this Warrant. Additionally, the Purchase
Price shall be immediately adjusted to equal the quotient obtained by dividing
(x) the aggregate Purchase Price of the maximum number of shares of Common Stock
for which this Warrant was exercisable immediately prior to the Termination Date
by (y) the number of shares of Common Stock of the Company for which this
Warrant is exercisable immediately after the Termination Date, all subject to
further adjustment as provided herein.

         4.6  Issuances Below Market. In case the Company shall issue or sell
              ----------------------
(a) Common Stock, (b) rights, warrants or options entitling the holders thereof
to subscribe for or purchase shares of Common Stock or (c) any security
convertible into Common Stock, in each case at a price, or having an exercise or
conversion price, per share less than the Purchase Price (excluding any issuance
for which an appropriate and full adjustment has been made pursuant to Section
4.2), the Purchase Price shall be immediately reduced by multiplying the
Purchase Price by a fraction of which (A) the numerator shall be the number of
shares of Common Stock outstanding immediately prior to such issuance or sale
plus the number of shares of Common Stock which the aggregate consideration
received or receivable (I) for the total number of shares of Common Stock,
rights, warrants or options or convertible securities so issued or sold and (II)
upon the exercise or conversion of all such rights, warrants, options or
securities, would purchase at such Purchase Price, and (B) the denominator shall
be the number of shares of Common Stock outstanding immediately prior to such
issuance plus (without duplication) the number of shares of Common Stock subject
to all such rights, warrants, options and convertible securities. The issuance
of any shares of Common Stock or other rights, warrants, options or convertible
securities pursuant to (a) the effectuation of a split or subdivision of the
outstanding shares of Common Stock or a dividend or other distribution payable
in additional shares of Common Stock or other securities or rights convertible
into, or entitling the holder thereof to receive directly or indirectly,
additional shares of Common Stock, (b) Common Stock (or securities exercisable
or convertible into Common Stock) issuable or issued to employees, consultants
or directors of the Company after the Purchase Date directly or pursuant to a
stock option plan or restricted stock plan approved by the Board of Directors of
the Company, (c) securities issued pursuant to the conversion or exercise of
convertible or exercisable securities outstanding or deemed outstanding on the
date of this Warrant, and (d) securities issued or issuable in connection with
the acquisition, merger, consolidation, or other business combination by or of
the Company with, by, or of any person, shall not be deemed to constitute an
issuance or sale to which this Section 4.6 applies.

                                       5
<PAGE>

         5.   CERTIFICATE AS TO ADJUSTMENTS. In each case of any adjustment in
the Purchase Price, or number or type of shares issuable upon exercise of this
Warrant, the Chief Financial Officer or Controller of the Company shall compute
such adjustment in accordance with the terms of this Warrant and prepare a
certificate setting forth such adjustment and showing in detail the facts upon
which such adjustment is based, including a statement of the adjusted Purchase
Price. The Company shall promptly send (by facsimile and by either first class
mail, postage prepaid or overnight delivery) a copy of each such certificate to
the Holder.

         6.   LOSS OR MUTILATION. Upon receipt of evidence reasonably
satisfactory to the Company of the ownership of and the loss, theft, destruction
or mutilation of this Warrant, and of indemnity reasonably satisfactory to it,
and (in the case of mutilation) upon surrender and cancellation of this Warrant,
the Company will execute and deliver in lieu thereof a new Warrant of like tenor
as the lost, stolen, destroyed or mutilated Warrant.

         7.   RESERVATION OF COMMON STOCK. The Company hereby covenants that at
all times there shall be reserved for issuance and delivery upon exercise of
this Warrant such number of shares of Common Stock or other shares of capital
stock of the Company as are from time to time issuable upon exercise of this
Warrant and, from time to time, will take all steps necessary to amend its
Certificate of Incorporation to provide sufficient reserves of shares of Common
Stock issuable upon exercise of this Warrant, including, without limitation,
engaging in best efforts to obtain the requisite stockholder approval of any
necessary amendment to the Certificate of Incorporation. All such shares shall
be duly authorized, and when issued upon such exercise, shall be validly issued,
fully paid and non-assessable, free and clear of all liens, security interests,
charges and other encumbrances or restrictions on sale and free and clear of all
preemptive rights, except encumbrances or restrictions arising under federal or
state securities laws. Issuance of this Warrant shall constitute full authority
to the Company's Officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for shares of
Common Stock upon the exercise of this Warrant.

         8.   TRANSFER AND EXCHANGE. Subject to the terms and conditions of this
Warrant and compliance with all applicable securities laws, this Warrant and all
rights hereunder may be transferred to any Registered Holder's parent,
subsidiary or affiliate, or, if the Registered Holder is a partnership, to any
partner of such Registered Holder, or, if the Registered Holder is a limited
liability company, to any member of such Registered Holder, in whole or in part,
on the books of the Company maintained for such purpose at the principal office
of the Company referred to above, by the Registered Holder hereof in person, or
by duly authorized attorney, upon surrender of this Warrant properly endorsed
and upon payment of any necessary transfer tax or other governmental charge
imposed upon such transfer. Upon any permitted partial transfer, the Company
will issue and deliver to the Registered Holder a new Warrant or Warrants with
respect to the shares of Common Stock not so transferred. Each taker and holder
of this Warrant, by taking or holding the same, consents and agrees that when
this Warrant shall have been so endorsed, the person in possession of this
Warrant may be treated by the Company, and all other persons dealing with this
Warrant, as the absolute owner hereof for any purpose and as the person entitled
to exercise the rights represented hereby, any notice to the contrary
notwithstanding; provided, however that until a transfer of this Warrant is duly
registered on the books of the Company, the Company may treat the Registered
Holder hereof as the owner for all purposes.

         9.   RESTRICTIONS ON TRANSFER. The Holder, by acceptance hereof, agrees
that, absent an effective registration statement filed with the Securities and
Exchange Commission

                                       6
<PAGE>

(the "SEC") under the Securities Act of 1933, as amended (the "Securities Act")
      ---                                                      --------------
covering the disposition or sale of this Warrant or the Common Stock issued or
issuable upon exercise hereof, as the case may be, and registration or
qualification under applicable state securities laws, such Holder will not sell,
transfer, pledge, or hypothecate any or all of this Warrant or such Common
Stock, as the case may be, unless either (i) the Company has received an opinion
of counsel, in form and substance reasonably satisfactory to the Company, to the
effect that such registration is not required in connection with such
disposition, (ii) the sale of such securities is made pursuant to SEC Rule 144or
(iii) such sale or transfer is to the Holder's parent, subsidiary or affiliate,
or, if the Holder is a partnership, to any partner of such Holder, or, if the
Holder is a limited liability company, to any member of such Holder, pursuant to
an exemption under the Securities Act.

         10.  COMPLIANCE WITH SECURITIES LAWS. By acceptance of this Warrant,
the Holder hereby represents, warrants and covenants that any shares of stock
purchased upon exercise of this Warrant shall be acquired for investment only
and not with a view to, or for sale in connection with, any distribution
thereof; that the Holder has had such opportunity as such Holder has deemed
adequate to obtain from representatives of the Company such information as is
necessary to permit the Holder to evaluate the merits and risks of its
investment in the Company; that the Holder is able to bear the economic risk of
holding such shares as may be acquired pursuant to the exercise of this Warrant
for an indefinite period; that the Holder understands that the shares of stock
acquired pursuant to the exercise of this Warrant will not be registered under
the Securities Act (unless otherwise required pursuant to exercise by the Holder
of the registration rights, if any, granted to the Registered Holder) and will
be "restricted securities" within the meaning of Rule 144 under the Securities
Act and that the exemption from registration under Rule 144 will not be
available for at least one (1) year from the date of exercise of this Warrant,
subject to any special treatment by the SEC for exercise of this Warrant
pursuant to Section 2.2, and even then will not be available unless a public
            -----------
market then exists for the stock, adequate information concerning the Company is
then available to the public, and other terms and conditions of Rule 144 are
complied with; and that all stock certificates representing shares of stock
issued to the Holder upon exercise of this Warrant or upon conversion of such
shares may have affixed thereto a legend substantially in the following form:

     THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR UNDER THE
     SECURITIES LAWS OF ANY STATE.  THESE SECURITIES ARE SUBJECT TO RESTRICTIONS
     ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT
     AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE SECURITIES LAWS,
     PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.  INVESTORS SHOULD BE AWARE
     THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS INVESTMENT
     FOR AN INDEFINITE PERIOD OF TIME.  THE ISSUER OF THESE SECURITIES MAY
     REQUIRE AN OPINION OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE
     ISSUER TO THE EFFECT THAT ANY PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE
     WITH THE ACT AND ANY APPLICABLE STATE SECURITIES LAWS.

         11.  NO RIGHTS OR LIABILITIES AS STOCKHOLDERS. This Warrant shall not
entitle the Holder to any voting rights or other rights as a stockholder of the
Company. In the

                                       7
<PAGE>

absence of affirmative action by such Holder to purchase Common Stock by
exercise of this Warrant or Common Stock upon conversion thereof, no provisions
of this Warrant, and no enumeration herein of the rights or privileges of the
Holder hereof shall cause such Holder hereof to be a stockholder of the Company
for any purpose.

         12.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company hereby
represents and warrants to Holder that:

              12.1   Due Authorization; Consents. All corporate action on the
                     ---------------------------
part of the Company, its officers, directors and shareholders necessary for (a)
the authorization, execution and delivery of, and the performance of all
obligations of the Company under, this Warrant, and (b) the authorization,
issuance, reservation for issuance and delivery of all of the Common Stock
issuable upon exercise of this Warrant, has been duly taken. This Warrant
constitutes a valid and binding obligation of the Company enforceable in
accordance with its terms, subject, as to enforcement of remedies, to applicable
bankruptcy, insolvency, moratorium, reorganization and similar laws affecting
creditors' rights generally and to general equitable principles. All consents,
approvals and authorizations of, and registrations, qualifications and filings
with, any federal or state governmental agency, authority or body, or any third
party, required in connection with the execution, delivery and performance of
this Warrant and the consummation of the transactions contemplated hereby and
thereby, including, without limitation, the issuance and delivery of all of the
Common Stock issuable upon exercise of this Warrant, have been obtained.

              12.2   Organization. The Company is a corporation duly organized,
                     ------------
validly existing and in good standing under the laws of the State of Delaware
and has all requisite corporate power to own, lease and operate its property and
to carry on its business as now being conducted and as currently proposed to be
conducted.

              12.3   Valid Issuance of Stock. The outstanding shares of the
                     -----------------------
capital stock of the Company are duly and validly issued, fully paid and non-
assessable, and such shares, and all outstanding options and other securities of
the Company, have been issued in full compliance with the registration and
prospectus delivery requirements of the Securities Act and the registration and
qualification requirements of all applicable state securities laws, or in
compliance with applicable exemptions therefrom, and all other provisions of
applicable federal and state securities laws, including without limitation,
anti-fraud provisions.

              12.4   Governmental Consents. All consents, approvals, orders,
                     ---------------------
authorizations or registrations, qualifications, declarations or filings with
any federal or state governmental authority on the part of the Company required
in connection with the consummation of the transactions contemplated herein,
including, without limitation, those under the Securities Act and all applicable
state securities laws, shall have been obtained prior to and be effective as of
the Effective Date.

              12.5   Listing on Nasdaq or Securities Exchange. The Company shall
                     ----------------------------------------
use its best efforts to list any shares of Common Stock issuable upon exercise
of this Warrant on Nasdaq or such other national securities exchange on which
shares of Common Stock are then listed. The Company will at its expense cause
all shares of Common Stock issued upon exercise of this Warrant to be listed on
Nasdaq and/or such other national securities exchange on which shares of Common
Stock are then listed at the time of such issuance and shall maintain such
listing.

                                       8
<PAGE>

              12.6   No Impairment. The Company further covenants that it will
                     -------------
not, by amendment of its Certificate of Incorporation or through reorganization,
consolidation, merger, dissolution or sale of assets, or by any other voluntary
act, avoid or seek to avoid the observance or performance of any of the
covenants, stipulations or conditions to be observed or performed hereunder by
the Company.

         13.  NOTICES. Except as may be otherwise provided herein, all notices,
requests, waivers and other communications made pursuant to this Agreement shall
be in writing and shall be conclusively deemed to have been duly given (a) when
hand delivered to the other party; (b) when received when sent by facsimile at
the address and number set forth below; (c) three business days after deposit in
the U.S. mail with first class or certified mail receipt requested postage
prepaid and addressed to the other party as set forth below; or (d) the next
business day after deposit with a national overnight delivery service, postage
prepaid, addressed to the parties as set forth below with next-business-day
delivery guaranteed, provided that the sending party receives a confirmation of
delivery from the delivery service provider.

<TABLE>
<CAPTION>
<S>      <C>                                                 <C>
          To Holder:                                         To the Company:
          Stargen II LLC                                     BioSource International, Inc.
                                                             820 Flynn Road
                                                             Camarillo, California 93012
                                                             Telephone No.:  (805)
                                                             Facsimile No.:   (805)
                                                             Attention:  James Chamberlain
                                                             President and Chief Executive Officer

          With copies to (which shall not                    With copies to (which shall not
          constitute notice):                                constitute notice):
          Latham & Watkins                                   Troop Steuber Pasich Reddic & Tobey,
          505 Montgomery Street, Suite 1900                  LLP
          San Francisco, CA 94111-2562                       2029 Century Park East, 24th Floor
          Telephone No.:  (415) 391-0600                     Los Angeles, CA  90067
          Facsimile No.:   (415) 395-8095                    Telephone No.:  (310) 728-3222
          Attention:  Scott Haber, Esq.                      Facsimile No.:  (310) 728-2222
                                                             Attention: Scott W. Alderton Esq.

</TABLE>

Each person making a communication hereunder by facsimile shall promptly confirm
by telephone to the person to whom such communication was addressed each
communication made by it by facsimile pursuant hereto but the absence of such
confirmation shall not affect the validity of any such communication.  A party
may change or supplement the addresses given above, or designate additional
addresses, for purposes of this Section 14 by giving the other party written
                                ----------
notice of the new address in the manner set forth above.

         14.  HEADINGS. The headings in this Warrant are for purposes of
convenience in reference only, and shall not be deemed to constitute a part
hereof.

         15.  LAW GOVERNING. This Warrant shall be construed and enforced in
accordance with, and governed by, the laws of the State of California, with
regard to conflict of law principles of such state.

                                       9
<PAGE>

         16.  NO IMPAIRMENT. The Company will not, by amendment of its
Certificate of Incorporation or bylaws, or through reorganization,
consolidation, merger, dissolution, issue or sale of securities, sale of assets
or any other voluntary action, avoid or seek to avoid the observance or
performance of any of the terms of this Warrant, but will at all times in good
faith assist in the carrying out of all such terms and in the taking of all such
action as may be necessary or appropriate in order to protect the rights of the
Registered Holder of this Warrant against impairment. Without limiting the
generality of the foregoing, the Company (a) will not increase the par value of
any shares of stock issuable upon the exercise of this Warrant above the amount
payable therefor upon such exercise, and (b) will take all such action as may be
necessary or appropriate in order that the Company may validly and legally issue
fully paid and non-assessable shares of Common Stock upon exercise of this
Warrant.

         17.  NOTICES OF RECORD DATE.  In case:

              17.1  the Company shall take a record of the holders of its Common
Stock (or other stock or securities at the time receivable upon the exercise of
this Warrant), for the purpose of entitling them to receive any dividend or
other distribution, or any right to subscribe for or purchase any shares of
stock of any class or any other securities or to receive any other right; or

              17.2  of any consolidation or merger of the Company with or into
another corporation, any capital reorganization of the Company, any
reclassification of the capital stock of the Company, or any conveyance of all
or substantially all of the assets of the Company to another corporation in
which holders of the Company's stock are to receive stock, securities or
property of another corporation; or

              17.3  of any voluntary dissolution, liquidation or winding-up of
the Company; or 17.4 of any redemption or conversion of all outstanding Common
Stock;

then, and in each such case, the Company will mail or cause to be mailed to the
Registered Holder of this Warrant a notice specifying, as the case may be, (i)
the date on which a record is to be taken for the purpose of such dividend,
distribution or right, or (ii) the date on which such reorganization,
reclassification, consolidation, merger, conveyance, dissolution, liquidation,
winding-up, redemption or conversion is to take place, and the time, if any is
to be fixed, as of which the holders of record of Common Stock or (such stock or
securities as at the time are receivable upon the exercise of this Warrant),
shall be entitled to exchange their shares of Common Stock (or such other stock
or securities), for securities or other property deliverable upon such
reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding-up.  The Company shall use all reasonable
efforts to ensure such notice shall be delivered at least thirty (30) days prior
to the date therein specified.

         18.  SEVERABILITY. If any term, provision, covenant or restriction of
this Warrant is held by a court of competent jurisdiction to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Warrant shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.

         19.  COUNTERPARTS. For the convenience of the parties, any number of
counterparts of this Warrant may be executed by the parties hereto and each such
executed counterpart shall be, and shall be deemed to be, an original
instrument.

                                       10
<PAGE>

         20.  NO INCONSISTENT AGREEMENTS. The Company will not on or after the
date of this Warrant enter into any agreement with respect to its securities
which is inconsistent with the rights granted to the Holders of this Warrant or
otherwise conflicts with the provisions hereof. The rights granted to the
Holders hereunder do not in any way conflict with and are not inconsistent with
the rights granted to holders of the Company's securities under any other
agreements, except rights that have been waived.

         21.  SATURDAYS, SUNDAYS AND HOLIDAYS. If the Expiration Date falls on a
Saturday, Sunday or legal holiday, the Expiration Date shall automatically be
extended until 5:00 p.m. the next business day.

         22.  ENTIRE AGREEMENT. This Warrant, the Securities Purchase Agreement
dated as of January 10, 2000 by and among the Company and the Holder, and the
Investor Rights Agreement dated as of February __, 2000 by and among the Company
and the Holder, contain the sole and entire agreement and understanding of the
parties with respect to the entire subject matter of this Warrant, and any and
all prior discussions, negotiations, commitments and understandings, whether
oral or otherwise, related to the subject matter of this Warrant are hereby
merged herein.

     IN WITNESS WHEREOF, the Company has caused this Warrant to be duly executed
as of the Effective Date.

BIOSOURCE INTERNATIONAL, INC.

-------------------------------------------
By
Printed Name
Title

                                       11
<PAGE>

                                   EXHIBIT A
                                   ---------

                              NOTICE OF EXERCISE
                   (To be executed upon exercise of Warrant)

BioSource International, Inc.

The undersigned hereby irrevocably elects to exercise the right of purchase
represented by the within Warrant Certificate for, and to purchase thereunder,
the securities of BioSource International, Inc., as provided for therein, and
(check the applicable box):

[ ]     tenders herewith payment of the exercise price in full in the form of
        cash or a certified or official bank check in same-day funds in the
        amount of $____________ for _________ such securities.

[ ]     Elects the [Net Issue Exercise][Easy Sale Exercise] option pursuant to
        Section 2.2 or 2.3 of the Warrant, and accordingly requests delivery of
        a net of ______________ of such securities.

Please issue a certificate or certificates for such securities in the name of,
and pay any cash for any fractional share to (please print name, address and
social security number):

Name:         ------------------------------------------------------------------

Address:      ------------------------------------------------------------------

Signature:    ------------------------------------------------------------------

Note:  The above signature should correspond exactly with the name on the first
page of this Warrant Certificate or with the name of the assignee appearing in
the assignment form below.

If said number of shares shall not be all the shares purchasable under the
within Warrant Certificate, a new Warrant Certificate is to be issued in the
name of said undersigned for the balance remaining of the shares purchasable
thereunder rounded up to the next higher whole number of shares.

                                       12
<PAGE>

                                   EXHIBIT B
                                   ---------

                                   ASSIGNMENT

          (To be executed only upon assignment of Warrant Certificate)

For value received, hereby sells, assigns and transfers unto _______________ the
within Warrant Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint ____________________________
attorney, to transfer said Warrant Certificate on the books of the within-named
Company with respect to the number of Warrants set forth below, with full power
of substitution in the premises:

--------------------------------------------------------------------------------
  Name(s) of Assignee(s)             Address                   # of Warrants
--------------------------------------------------------------------------------

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

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

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

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

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

And if said number of Warrants shall not be all the Warrants represented by the
Warrant Certificate, a new Warrant Certificate is to be issued in the name of
said undersigned for the balance remaining of the Warrants registered by said
Warrant Certificate.

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

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

Signature:    ------------------------------------------------------------------

Notice:  The signature to the foregoing Assignment must correspond to the name
as written upon the face of this security in every particular, without
alteration or any change whatsoever; signature(s) must be guaranteed by an
eligible guarantor institution (banks, stock brokers, savings and loan
associations and credit unions with membership in an approved signature
guarantee medallion program) pursuant to Securities and Exchange Commission Rule
17Ad-15.

                                       13<PAGE>

                                                                    EXHIBIT 10.1

                             QUALSTAR CORPORATION

                           1998 STOCK INCENTIVE PLAN
                            As Amended and Restated

     The 1998 STOCK INCENTIVE PLAN (the "Plan") of Qualstar Corporation, a
California corporation (the "Company"), originally adopted by its Board of
Directors as of February 4, 1998 (the "Effective Date"), is hereby amended and
restated as of January 14, 2000.

                                  Article 1.

                             PURPOSES OF THE PLAN
                             --------------------

     1.1  Purposes.  The purposes of the Plan are (a) to enhance the Company's
          --------
ability to attract and retain the services of qualified employees, officers and
directors (including non-employee officers and directors), and consultants and
other service providers upon whose judgment, initiative and efforts the
successful conduct and development of the Company's business largely depends,
and (b) to provide additional incentives to such persons or entities to devote
their utmost effort and skill to the advancement and betterment of the Company,
by providing them an opportunity to participate in the ownership of the Company
and thereby have an interest in the success and increased value of the Company.

                                  Article 2.

                                  DEFINITIONS
                                  -----------

     For purposes of this Plan, the following terms shall have the meanings
indicated:

     2.1  Administrator.  "Administrator" means the Board or, if the Board
          -------------
delegates responsibility for any matter to the Committee, the term Administrator
shall mean the Committee.

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

     2.3  Board.  "Board" means the Board of Directors of the Company.
          -----

     2.4  Change in Control.  "Change in Control" shall mean (i) the
          -----------------
acquisition, directly or indirectly, by any person or group (within the meaning
of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended) of the
beneficial ownership of securities of the Company possessing more than fifty
percent (50%) of the total combined voting power of all outstanding securities
of the Company; (ii) a merger or consolidation in which the Company is not the
surviving entity, except for a transaction in which the holders of the
outstanding voting securities of the Company immediately prior to such merger or
consolidation hold, in the aggregate, securities possessing more than fifty
percent (50%) of the total combined voting power of all outstanding voting
securities of the surviving entity immediately after such merger or
consolidation; (iii) a reverse merger in which the Company is the surviving
entity but in which securities possessing more than fifty percent (50%) of the
total combined voting power of all outstanding voting securities of the Company
are transferred to or acquired by a person or persons different from the persons
holding those securities immediately prior to such merger; (iv) the sale,
transfer or other disposition (in one transaction or a series of related
transactions) of all or substantially all of the assets of the Company;
<PAGE>

or (v) the approval by the shareholders of a plan or proposal for the
liquidation or dissolution of the Company.

     2.5   Code.  "Code" means the Internal Revenue Code of 1986, as amended
           ----
from time to time.

     2.6   Committee.  "Committee" means a committee of two or more members of
           ---------
the Board appointed to administer the Plan, as set forth in Section 7.1 hereof.

     2.7   Common Stock.  "Common Stock" means the Common Stock of the Company,
           ------------
subject to adjustment pursuant to Section 4.2 hereof.

     2.8   Disability.  "Disability" means permanent and total disability as
           ----------
defined in Section 22(e)(3) of the Code.  The Administrator's determination of a
Disability or the absence thereof shall be conclusive and binding on all
interested parties.

     2.9   Effective Date.  "Effective Date" means the date on which the Plan
           --------------
was originally adopted by the Board, as set forth on the first page hereof.

     2.10  Exercise Price.  "Exercise Price" means the purchase price per share
           --------------
of Common Stock payable upon exercise of an Option.

     2.11  Fair Market Value.   "Fair Market Value" on any given date means the
           -----------------
value of one share of Common Stock, determined as follows:

           (a)  If the Common Stock is then listed or admitted to trading on a
NASDAQ market system or a stock exchange which reports closing sale prices, the
Fair Market Value shall be the closing sale price on the date of valuation on
such NASDAQ market system or principal stock exchange on which the Common Stock
is then listed or admitted to trading, or, if no closing sale price is quoted on
such day, then the Fair Market Value shall be the closing sale price of the
Common Stock on such NASDAQ market system or such exchange on the next preceding
day for which a closing sale price is reported.

           (b)  If the Common Stock is not then listed or admitted to trading on
a NASDAQ market system or a stock exchange which reports closing sale prices,
the Fair Market Value shall be the average of the closing bid and asked prices
of the Common Stock in the over-the-counter market on the date of valuation.

           (c)  If neither (a) nor (b) is applicable as of the date of
valuation, then the Fair Market Value shall be determined by the Administrator
in good faith using any reasonable method of evaluation, which determination
shall be conclusive and binding on all interested parties.

     2.12  Incentive Option.  "Incentive Option" means any Option designated and
           ----------------
qualified as an "incentive stock option" as defined in Section 422 of the Code.

     2.13  Incentive Option Agreement.  "Incentive Option Agreement" means an
           --------------------------
Option Agreement with respect to an Incentive Option.

     2.14  NASD Dealer.  "NASD Dealer" means a broker-dealer that is a member of
           -----------
the National Association of Securities Dealers, Inc.

                                       2
<PAGE>

     2.15  Nonqualified Option.  "Nonqualified Option" means any Option that is
           -------------------
not an Incentive Option.  To the extent that any Option designated as an
Incentive Option fails in whole or in part to qualify as an Incentive Option,
including, without limitation, for failure to meet the limitations applicable to
a 10% Shareholder or because it exceeds the annual limit provided for in Section
5.6 below, it shall to that extent constitute a Nonqualified Option.

     2.16  Nonqualified Option Agreement.  "Nonqualified Option Agreement" means
           -----------------------------
an Option Agreement with respect to a Nonqualified Option.

     2.17  Offeree.  "Offeree" means a Participant to whom a Right to Purchase
           -------
has been offered or who has acquired Restricted Stock under the Plan.

     2.18  Option.  "Option" means any option to purchase Common Stock granted
           ------
pursuant to the Plan.

     2.19  Option Agreement.  "Option Agreement" means the written agreement
           ----------------
entered into between the Company and the Optionee with respect to an Option
granted under the Plan.

     2.20  Optionee.  "Optionee" means a Participant who holds an Option.
           --------

     2.21  Participant.  "Participant" means an individual or entity who holds
           -----------
an Option, a Right to Purchase or Restricted Stock under the Plan.

     2.22  Purchase Price.  "Purchase Price" means the purchase price per share
           --------------
of Restricted Stock payable upon acceptance of a Right to Purchase.

     2.23  Restricted Stock.  "Restricted Stock" means shares of Common Stock
           ----------------
issued pursuant to Article 6 hereof, subject to any restrictions and conditions
as are established pursuant to such Article 6.

     2.24  Right to Purchase.  "Right to Purchase" means a right to purchase
           -----------------
Restricted Stock granted to an Offeree pursuant to Article 6 hereof.

     2.25  Service Provider.  "Service Provider" means a consultant or other
           ----------------
person or entity who provides services to the Company or an Affiliated Company
and who the Administrator authorizes to become a  Participant in the Plan.

     2.26  Stock Purchase Agreement.  "Stock Purchase Agreement" means the
           ------------------------
written agreement entered into between the Company and the Offeree with respect
to a Right to Purchase offered under the Plan.

     2.27  10% Shareholder.  "10% Shareholder" means a person who, as of a
           ---------------
relevant date, owns or is deemed to own (by reason of the attribution rules
applicable under Section 424(d) of the Code) stock possessing more than 10% of
the total combined voting power of all classes of stock of the Company or of an
Affiliated Company.

                                       3
<PAGE>

                                   Article 3.

                                  ELIGIBILITY
                                  -----------

     3.1  Incentive Options.  Only employees of the Company or of an Affiliated
          -----------------
Company (including officers of the Company and members of the Board if they are
employees of the Company or of an Affiliated Company) are eligible to receive
Incentive Options under the Plan.

     3.2  Nonqualified Options and Rights to Purchase.  Employees of the Company
          -------------------------------------------
or of an Affiliated Company, officers of the Company and members of the Board
(whether or not employed by the Company or an Affiliated Company), and Service
Providers are eligible to receive Nonqualified Options or Rights to Purchase
under the Plan.

     3.3  Limitation on Shares.  In no event shall any Participant be granted
          --------------------
Options or Rights to Purchase in any one calendar year pursuant to which the
aggregate number of shares of Common Stock that may be acquired thereunder
exceeds 50,000 shares.

                                   Article 4.

                                  PLAN SHARES
                                  -----------

     4.1  Shares Subject to the Plan.  A total of 450,000* shares of Common
          --------------------------
Stock may be issued under the Plan, subject to adjustment as to the number and
kind of shares pursuant to Section 4.2 hereof. For purposes of this limitation,
in the event that (a) all or any portion of any Option or Right to Purchase
granted or offered under the Plan can no longer under any circumstances be
exercised, or (b) any shares of Common Stock are reacquired by the Company
pursuant to an Incentive Option Agreement, Nonqualified Option Agreement or
Stock Purchase Agreement, the shares of Common Stock allocable to the
unexercised portion of such Option or such Right to Purchase, or the shares so
reacquired, shall again be available for grant or issuance under the Plan.

     4.2  Changes in Capital Structure.   In the event that the outstanding
          ----------------------------
shares of Common Stock are hereafter increased or decreased or changed into or
exchanged for a different number or kind of shares or other securities of the
Company by reason of a recapitalization, stock split, combination of shares,
reclassification, stock dividend, or other change in the capital structure of
the Company, then appropriate adjustments shall be made by the Administrator to
the aggregate number and kind of shares subject to this Plan, and the number and
kind of shares and the price per share subject to outstanding Option Agreements,
Rights to Purchase and Stock Purchase Agreements, in order to preserve, as
nearly as practicable, but not to increase, the benefits to Participants.

                                   Article 5.

                                    OPTIONS
                                    -------

     5.1  Option Agreement.  Each Option granted pursuant to this Plan shall be
          ----------------
evidenced by an Option Agreement which shall specify the number of shares
subject thereto, the Exercise Price per share, and whether the Option is an
Incentive Option or Nonqualified Option.  As soon as is practical

-------------------
     *  1,215,000 shares, as adjusted for a 2.7-for-1 stock split that will
become effective in March 2000.

                                       4
<PAGE>

following the grant of an Option, an Option Agreement shall be duly executed and
delivered by or on behalf of the Company to the Optionee to whom such Option was
granted. Each Option Agreement shall be in such form and contain such additional
terms and conditions, not inconsistent with the provisions of this Plan, as the
Administrator shall, from time to time, deem desirable, including, without
limitation, the imposition of any rights of first refusal and resale obligations
upon any shares of Common Stock acquired pursuant to an Option Agreement. Each
Option Agreement may be different from each other Option Agreement.

     5.2  Exercise Price.  The Exercise Price per share of Common Stock covered
          --------------
by each Option shall be determined by the Administrator, subject to the
following:  (a) the Exercise Price of an Incentive Option shall not be less than
100% of Fair Market Value on the date the Incentive Option is granted, (b) the
Exercise Price of a Nonqualified Option shall not be less than 100% of Fair
Market Value on the date the Nonqualified Option is granted, and (c) if the
person to whom an Option is granted is a 10% Shareholder on the date of grant,
the Exercise Price shall not be less than 110% of Fair Market Value on the date
the Option is granted.

     5.3  Payment of Exercise Price.  Payment of the Exercise Price shall be
          -------------------------
made upon exercise of an Option and may be made, in the discretion of the
Administrator, subject to any legal restrictions, by: (a) cash; (b) check; (c)
the surrender of shares of Common Stock owned by the Optionee that have been
held by the Optionee for at least six (6) months, which surrendered shares shall
be valued at Fair Market Value as of the date of such exercise; (d) the
Optionee's promissory note in a form and on terms acceptable to the
Administrator; (e) the cancellation of indebtedness of the Company to the
Optionee; (f) the waiver of compensation due or accrued to the Optionee for
services rendered; (g) provided that a public market for the Common Stock
exists, a "same day sale" commitment from the Optionee and an NASD Dealer
whereby the Optionee irrevocably elects to exercise the Option and to sell a
portion of the shares so purchased to pay for the Exercise Price and whereby the
NASD Dealer irrevocably commits upon receipt of such shares to forward the
Exercise Price directly to the Company; (h) provided that a public market for
the Common Stock exists, a "margin" commitment from the Optionee and an NASD
Dealer whereby the Optionee irrevocably elects to exercise the Option and to
pledge the shares so purchased to the NASD Dealer in a margin account as
security for a loan from the NASD Dealer in the amount of the Exercise Price,
and whereby the NASD Dealer irrevocably commits upon receipt of such shares to
forward the Exercise Price directly to the Company; or (i) any combination of
the foregoing methods of payment or any other consideration or method of payment
as shall be permitted by applicable corporate law.

     5.4  Term and Termination of Options.  The term and provisions for
          -------------------------------
termination of each Option shall be as fixed by the Administrator, but no Option
may be exercisable more than ten (10) years after the date it is granted. An
Incentive Option granted to a person who is a 10% Shareholder on the date of
grant shall not be exercisable more than five (5) years after the date it is
granted.

     5.5  Vesting and Exercise of Options.  Each Option shall vest and become
          -------------------------------
exercisable in one or more installments at such time or times and subject to
such conditions, including without limitation the achievement of specified
performance goals or objectives, as shall be determined by the Administrator.

     5.6  Annual Limit on Incentive Options.  To the extent required for
          ---------------------------------
"incentive stock option" treatment under Section 422 of the Code, the aggregate
Fair Market Value (determined as of the time of grant) of the Common Stock shall
not, with respect to which Incentive Options granted

                                       5
<PAGE>

under this Plan and any other plan of the Company or any Affiliated Company
become exercisable for the first time by an Optionee during any calendar year,
exceed $100,000.

     5.7  Nontransferability of Options.  No Option shall be assignable or
          -----------------------------
transferable except by will or the laws of descent and distribution, and during
the life of the Optionee shall be exercisable only by such Optionee; provided,
however, that, in the discretion of the Administrator, any Option may be
assigned or transferred in any manner which an "incentive stock option" is
permitted to be assigned or transferred under the Code.

     5.8  Rights as Shareholder.  An Optionee or permitted transferee of an
          ---------------------
Option shall have no rights or privileges as a shareholder with respect to any
shares covered by an Option until such Option has been duly exercised and
certificates representing shares purchased upon such exercise have been issued
to such person.

                                  Article 6.

                              RIGHTS TO PURCHASE
                              ------------------

     6.1  Nature of Right to Purchase.  A Right to Purchase granted to an
          ---------------------------
Offeree entitles the Offeree to purchase, for a Purchase Price determined by the
Administrator, shares of Common Stock subject to such terms, restrictions and
conditions as the Administrator may determine at the time of grant ("Restricted
Stock"). Such conditions may include, but are not limited to, continued
employment or the achievement of specified performance goals or objectives.

     6.2  Acceptance of Right to Purchase.  An Offeree shall have no rights with
          -------------------------------
respect to the Restricted Stock subject to a Right to Purchase unless the
Offeree shall have accepted the Right to Purchase within thirty (30) days (or
such longer or shorter period as the Administrator may specify) following the
grant of the Right to Purchase by making payment of the full Purchase Price to
the Company in the manner set forth in Section 6.3 hereof and by executing and
delivering to the Company a Stock Purchase Agreement. Each Stock Purchase
Agreement shall be in such form, and shall set forth the Purchase Price and such
other terms, conditions and restrictions of the Restricted Stock, not
inconsistent with the provisions of this Plan, as the Administrator shall, from
time to time, deem desirable. Each Stock Purchase Agreement may be different
from each other Stock Purchase Agreement.

     6.3  Payment of Purchase Price.    Subject to any legal restrictions,
          -------------------------
payment of the Purchase Price upon acceptance of a Right to Purchase Restricted
Stock may be made, in the discretion of the Administrator, by: (a) cash; (b)
check; (c) the surrender of shares of Common Stock owned by the Offeree that
have been held by the Offeree for at least six (6) months, which surrendered
shares shall be valued at Fair Market Value as of the date of such exercise; (d)
the Offeree's promissory note in a form and on terms acceptable to the
Administrator; (e) the cancellation of indebtedness of the Company to the
Offeree; (f) the waiver of compensation due or accrued to the Offeree for
services rendered; or (g) any combination of the foregoing methods of payment or
any other consideration or method of payment as shall be permitted by applicable
corporate law.

     6.4  Rights as a Shareholder.  Upon complying with the provisions of
          -----------------------
Section 6.2 hereof, an Offeree shall have the rights of a shareholder with
respect to the Restricted Stock purchased pursuant to the Right to Purchase,
including voting and dividend rights, subject to the terms, restrictions and
conditions as are set forth in the Stock Purchase Agreement. Unless the

                                       6
<PAGE>

Administrator shall determine otherwise, certificates evidencing shares of
Restricted Stock shall remain in the possession of the Company until such shares
have vested in accordance with the terms of the Stock Purchase Agreement.

     6.5  Restrictions.  Shares of Restricted Stock may not be sold, assigned,
          ------------
transferred, pledged or otherwise encumbered or disposed of except as
specifically provided in the Stock Purchase Agreement. In the event of
termination of a Participant's employment, service as a director of the Company
or Service Provider status for any reason whatsoever (including death or
disability), the Stock Purchase Agreement may provide, in the discretion of the
Administrator, that the Company shall have the right, exercisable at the
discretion of the Administrator, to repurchase (i) at the original Purchase
Price, any shares of Restricted Stock which have not vested as of the date of
termination, and (ii) at Fair Market Value, any shares of Restricted Stock which
have vested as of such date, on such terms as may be provided in the Stock
Purchase Agreement.

     6.6  Vesting of Restricted Stock.  The Stock Purchase Agreement shall
          ---------------------------
specify the date or dates, the performance goals or objectives which must be
achieved, and any other conditions on which the Restricted Stock may vest.

     6.7  Dividends.  If payment for shares of Restricted Stock is made by
          ---------
promissory note, any cash dividends paid with respect to the Restricted Stock
may be applied, in the discretion of the Administrator, to repayment of such
note.

     6.8  Nonassignability of Rights.  No Right to Purchase shall be assignable
          --------------------------
or transferable except by will or the laws of descent and distribution or as
otherwise provided by the  Administrator.

                                  Article 7.

                          ADMINISTRATION OF THE PLAN
                          --------------------------

     7.1  Administrator.  Authority to control and manage the operation and
          -------------
administration of the Plan shall be vested in the Board, which may delegate such
responsibilities in whole or in part to a committee consisting of two (2) or
more members of the Board (the "Committee"). Members of the Committee may be
appointed from time to time by, and shall serve at the pleasure of, the Board.
As used herein, the term "Administrator" means the Board or, with respect to any
matter as to which responsibility has been delegated to the Committee, the term
Administrator shall mean the Committee.

     7.2  Powers of the Administrator.  In addition to any other powers or
          ---------------------------
authority conferred upon the Administrator elsewhere in the Plan or by law, the
Administrator shall have full power and authority: (a) to determine the persons
to whom, and the time or times at which, Incentive Options or Nonqualified
Options shall be granted and Rights to Purchase shall be offered, the number of
shares to be represented by each Option and Right to Purchase and the
consideration to be received by the Company upon the exercise thereof; (b) to
interpret the Plan; (c) to create, amend or rescind rules and regulations
relating to the Plan; (d) to determine the terms, conditions and restrictions
contained in, and the form of, Option Agreements and Stock Purchase Agreements;
(e) to determine the identity or capacity of any persons who may be entitled to
exercise a Participant's rights under any Option or Right to Purchase under the
Plan; (f) to correct any defect or supply any omission or reconcile any
inconsistency in the Plan or in any Option Agreement or Stock Purchase
Agreement; (g) to accelerate the vesting of any Option or release or waive any
repurchase rights of the Company with respect to Restricted Stock; (h) to extend
the exercise date of any Option or

                                       7
<PAGE>

acceptance date of any Right to Purchase; (i) to provide for rights of first
refusal and/or repurchase rights; (j) to amend outstanding Option Agreements and
Stock Purchase Agreements to provide for, among other things, any change or
modification which the Administrator could have provided for upon the grant of
an Option or Right to Purchase or in furtherance of the powers provided for
herein; and (k) to make all other determinations necessary or advisable for the
administration of the Plan, but only to the extent not contrary to the express
provisions of the Plan. Any action, decision, interpretation or determination
made in good faith by the Administrator in the exercise of its authority
conferred upon it under the Plan shall be final and binding on the Company and
all Participants.

     7.3  Limitation on Liability.  No employee of the Company or member of the
          -----------------------
Board or Committee shall be subject to any liability with respect to duties
under the Plan unless the person acts fraudulently or in bad faith. To the
extent permitted by law, the Company shall indemnify each member of the Board or
Committee, and any employee of the Company with duties under the Plan, who was
or is a party, or is threatened to be made a party, to any threatened, pending
or completed proceeding, whether civil, criminal, administrative or
investigative, by reason of such person's conduct in the performance of duties
under the Plan.

                                  Article 8.

                               CHANGE IN CONTROL
                               -----------------

     8.1  Change in Control.  In order to preserve a Participant's rights in the
          -----------------
event of a Change in Control of the Company:

     (a)  Vesting of all outstanding Options shall accelerate automatically
effective as of immediately prior to the consummation of the Change in Control
unless the Options are to be assumed by the acquiring or successor entity (or
parent thereof) or new options or New Incentives are to be issued in exchange
therefor, as provided in subsection (b) below.

     (b)  Vesting of outstanding Options shall not accelerate if and to the
                                               ---
extent that: (i) the Options (including the unvested portion thereof) are to be
assumed by the acquiring or successor entity (or parent thereof) or new options
of comparable value are to be issued in exchange therefor pursuant to the terms
of the Change in Control transaction, or (ii) the Options (including the
unvested portion thereof) are to be replaced by the acquiring or successor
entity (or parent thereof) with other incentives under a new incentive program
("New Incentives") containing such terms and provisions as the Administrator in
its discretion may consider equitable. If outstanding Options are assumed, or if
new options of comparable value are issued in exchange therefor, then each such
Option or new option shall be appropriately adjusted, concurrently with the
Change in Control, to apply to the number and class of securities or other
property that the Participant would have received pursuant to the Change in
Control transaction in exchange for the shares issuable upon exercise of the
Option had the Option been exercised immediately prior to the Change in Control,
and appropriate adjustment also shall be made to the Exercise Price such that
the aggregate Exercise Price of each such Option or new option shall remain the
same as nearly as practicable.

     (c)  The Administrator in its discretion may provide in any Option
Agreement that if such Option is assumed by an acquiring or successor entity (or
parent thereof) or a new option of comparable value or New Incentive is issued
in exchange therefor pursuant to the terms of a Change in Control transaction,
then vesting of the Option, the new option or the New Incentive shall

                                       8
<PAGE>

accelerate if and at such time as the Participant's service as an employee,
director, officer, consultant or other service provider to the acquiring or
successor entity (or a parent or subsidiary thereof) is terminated involuntarily
within a specified period following consummation of the Change in Control,
pursuant to such terms and conditions as shall be set forth in the Option
Agreement.

     (d)  If outstanding Options will accelerate pursuant to subsection (a)
above, the Administrator in its discretion may provide, in connection with the
Change in Control transaction, for the purchase or exchange of each Option for
an amount of cash or other property having a value equal to the difference (or
"spread") between: (x) the value of the cash or other property that the
Participant would have received pursuant to the Change in Control transaction in
exchange for the shares issuable upon exercise of the Option had the Option been
exercised immediately prior to the Change in Control, and (y) the Exercise Price
of the Option.

     (e)  If a Participant holds shares of Restricted Stock that are not fully
vested at the time a Change in Control occurs, the provisions set forth above in
this Article 8 with respect to the vesting of Options also shall apply to the
vesting of shares of Restricted Stock. Thus, if the vesting of outstanding
Options does not accelerate because they are assumed or new options of
comparable value or New Incentives are issued in exchange therefor, as
contemplated by Section 8.1(b), then the vesting provisions of the Restricted
Stock shall also continue on a comparable basis following consummation of the
Change in Control. Likewise, if outstanding Options are not assumed and the
vesting of outstanding Options accelerates, as provided in Section 8.1(a), then
the vesting of shares of Restricted Stock also shall accelerate upon
consummation of the Change in Control.

     (f)  Outstanding Options shall terminate and cease to be exercisable upon
consummation of a Change in Control except to the extent that the Options are
assumed by the successor entity (or parent thereof) or new options of comparable
value or New Incentives are issued in exchange therefor pursuant to the terms of
the Change in Control transaction.

                                  Article 9.

                     AMENDMENT AND TERMINATION OF THE PLAN
                     -------------------------------------

     9.1  Amendments.  The Board may from time to time alter, amend, suspend or
          ----------
terminate the Plan in such respects as the Board may deem advisable. No such
alteration, amendment, suspension or termination shall be made which shall
substantially affect or impair the rights of any Participant under an
outstanding Option Agreement or Stock Purchase Agreement without such
Participant's consent. The Board may alter or amend the Plan to comply with
requirements under the Code relating to Incentive Options or other types of
options which give Optionees more favorable tax treatment than that applicable
to Options granted under this Plan as of the date of its adoption. Upon any such
alteration or amendment, any outstanding Option granted hereunder may, if the
Administrator so determines and if permitted by applicable law, be subject to
the more favorable tax treatment afforded to an Optionee pursuant to such terms
and conditions.

     9.2  Plan Termination.  Unless the Plan shall theretofore have been
          ----------------
terminated, the Plan shall terminate on the tenth (10th) anniversary of the
Effective Date and no Options or Rights to Purchase may be granted under the
Plan thereafter, but Option Agreements, Stock Purchase Agreements and Rights to
Purchase then outstanding shall continue in effect in accordance with their
respective terms.

                                       9
<PAGE>

                                  Article 10.

                                TAX WITHHOLDING
                                ---------------

     10.1  Withholding.  The Company shall have the power to withhold, or
           -----------
require a Participant to remit to the Company, an amount sufficient to satisfy
any applicable Federal, state, and local tax withholding requirements with
respect to any Options exercised or Restricted Stock issued under the Plan. To
the extent permissible under applicable tax, securities and other laws, the
Administrator may, in its sole discretion and upon such terms and conditions as
it may deem appropriate, permit a Participant to satisfy his or her obligation
to pay any such tax, in whole or in part, up to an amount determined on the
basis of the highest marginal tax rate applicable to such Participant, by (a)
directing the Company to apply shares of Common Stock to which the Participant
is entitled as a result of the exercise of an Option or as a result of the
purchase of or lapse of restrictions on Restricted Stock or (b) delivering to
the Company shares of Common Stock owned by the Participant. The shares of
Common Stock so applied or delivered in satisfaction of the Participant's tax
withholding obligation shall be valued at their Fair Market Value as of the date
of measurement of the amount of income subject to withholding.

                                  Article 11.

                                 MISCELLANEOUS
                                 -------------

     11.1  Benefits Not Alienable.  Other than as provided above, benefits under
           ----------------------
the Plan may not be assigned or alienated, whether voluntarily or involuntarily.
Any unauthorized attempt at assignment, transfer, pledge or other disposition
shall be without effect.

     11.2  No Enlargement of Employee Rights.  This Plan is strictly a voluntary
           ---------------------------------
undertaking on the part of the Company and shall not be deemed to constitute a
contract between the Company and any Participant to be consideration for, or an
inducement to, or a condition of, the employment of any Participant. Nothing
contained in the Plan shall be deemed to give the right to any Participant to be
retained as an employee of the Company or any Affiliated Company or to limit the
right of the Company or any Affiliated Company to discharge any Participant at
any time.

     11.3  Application of Funds.  The proceeds received by the Company from the
           --------------------
sale of Common Stock pursuant to Option Agreements and Stock Purchase
Agreements, except as otherwise provided herein, will be used for general
corporate purposes.

                                       10

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00004-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00004-of-00352.parquet"}]]