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                                                                   EXHIBIT 10.24

                               DIGIRAD CORPORATION
                             STOCK OPTION AGREEMENT

                                    RECITALS

         A. The Board of Directors of the Corporation has adopted the Digirad
Corporation 1998 Stock Option/Stock Issuance Plan (the "Plan") for the
purpose of attracting and retaining the services of persons who contribute to
the growth and financial success of the Corporation.

         B. Optionee is a person who the Plan Administrator believes has and
will contribute to the growth and financial success of the Corporation and
this Agreement is executed pursuant to and is intended to carry out the
purposes of the Plan.

                                    AGREEMENT

         NOW, THEREFORE, it is hereby agreed as follows:

         1. GRANT OF OPTION. Subject to and upon the terms and conditions set
forth in this Agreement, the Corporation hereby grants to Optionee, as of the
grant date (the "Grant Date") specified in the accompanying Notice of Grant
of Stock Option (the "Grant Notice"), a stock option to purchase up to that
number of shares of the Corporation's Common Stock (the "Option Shares") as
is specified in the Grant Notice. The Option Shares shall be purchasable from
time to time during the option term at the option price per share (the
"Option Price") specified in the Grant Notice. Capitalized terms used herein
which are not otherwise defined shall have the meaning ascribed to such terms
in the Plan.

         2. OPTION TERM. This option shall have a maximum term of ten (10)
years measured from the Grant Date and shall expire at the close of business
on the expiration date (the "Expiration Date") specified in the Grant Notice,
unless sooner terminated in accordance with Paragraph 5, 6 or 17.

         3. LIMITED TRANSFERABILITY. This option shall be neither
transferable nor assignable by Optionee other than by will or by the laws of
descent and distribution following Optionee's death and may be exercised,
during Optionee's lifetime, only by Optionee.

         4. DATES OF EXERCISE. This option may not be exercised in whole or
in part at any time prior to the time the Plan is approved by the
Corporation's shareholders in accordance with Paragraph 17. Provided such
shareholder approval is obtained, this option shall thereupon become
exercisable for the Option Shares in one or more installments as is specified
in the Grant Notice. As the option becomes exercisable in one or more
installments, the installments shall accumulate and the option shall remain
exercisable for such installments until the Expiration Date or the sooner
termination of the option term under Paragraph 5 or Paragraph 6 of this
Agreement.

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         5. SPECIAL TERMINATION OF OPTION TERM. The option term specified in
Paragraph 2 shall terminate (and this option shall cease to be exercisable)
prior to the Expiration Date should any of the following provisions become
applicable:

                                    (i)     Except as otherwise provided in
         subparagraph (ii) or (iii) below, should Optionee cease to remain in
         Service while this option is outstanding, then the period for
         exercising this option shall be reduced to a three (3)-month period
         commencing with the date of such cessation of Service, but in no
         event shall this option be exercisable at any time after the
         Expiration Date. Upon the expiration of such three (3)-month period
         or (if earlier) upon the Expiration Date, this option shall
         terminate and cease to be outstanding.

                                    (ii)    Should Optionee die while this
         option is outstanding, then the personal representative of the
         Optionee's estate or the person or persons to whom the option is
         transferred pursuant to the Optionee's will or in accordance with
         the law of descent and distribution shall have the right to exercise
         this option. Such right shall lapse and this option shall cease to
         be exercisable upon the EARLIER of (A) the expiration of the twelve
         (12) month period measured from the date of Optionee's death or (B)
         the Expiration Date. Upon the expiration of such twelve (12) month
         period or (if earlier) upon the Expiration Date, this option shall
         terminate and cease to be outstanding.

                                    (iii)   Should Optionee become permanently
         disabled and cease by reason thereof to remain in Service while this
         option is outstanding, then the Optionee shall have a period of
         twelve (12) months (commencing with the date of such cessation of
         Service) during which to exercise this option, but in no event shall
         this option be exercisable at any time after the Expiration Date.
         Optionee shall be deemed to be permanently disabled if Optionee is
         unable to engage in any substantial gainful activity for the
         Corporation or the parent or subsidiary corporation retaining
         his/her services by reason of any medically determinable physical or
         mental impairment, which can be expected to result in death or which
         has lasted or can be expected to last for a continuous period of not
         less than twelve (12) months. Upon the expiration of such limited
         period of exercisability or (if earlier) upon the Expiration Date,
         this option shall terminate and cease to be outstanding.

                                    (iv)    During the limited period of
         exercisability applicable under subparagraph (i), (ii) or (iii)
         above, this option may be exercised for any or all of the Option
         Shares for which this option is, at the time of the Optionee's
         cessation of Service, exercisable in accordance with the exercise
         schedule specified in the Grant Notice and the provisions of
         Paragraph 6 of this Agreement.

                                    (v)     For purposes of this Paragraph 5
         and for all other purposes under this Agreement:

                  A. The Optionee shall be deemed to remain in Service for so
long as the Optionee continues to render periodic services to the Corporation
or any parent or subsidiary

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corporation, whether as an Employee, a non-employee member of the board of
directors, or an independent contractor or consultant.

                  B. The Optionee shall be deemed to be an EMPLOYEE of the
Corporation and to continue in the Corporation's employ for so long as the
Optionee remains in the employ of the Corporation or one or more of its
parent or subsidiary corporations, subject to the control and direction of
the employer entity as to both the work to be performed and the manner and
method of performance.

                  C. A corporation shall be considered to be a SUBSIDIARY
corporation of the Corporation if it is a member of an unbroken chain of
corporations beginning with the Corporation, provided each such corporation
in the chain (other than the last corporation) owns, at the time of
determination, stock possessing 50% or more of the total combined voting
power of all classes of stock in one of the other corporations in such chain.

                  D. A corporation shall be considered to be a PARENT
corporation of the Corporation if it is a member of an unbroken chain ending
with the Corporation, provided each such corporation in the chain (other than
the Corporation) owns, at the time of determination, stock possessing 50% or
more of the total combined voting power of all classes of stock in one of the
other corporations in such chain.

         6.       EFFECT OF CORPORATE TRANSACTION.

                  A. Optionee shall automatically vest in full with respect
to all of the Option Shares in the event of a Corporate Transaction so that
each such option shall, immediately prior to the effective date of the
Corporate Transaction, may be exercised for any or all of the Option Shares
as fully-vested shares of Common Stock, provided that the Option Shares shall
not automatically vest in full if and to the extent: (i) this option is, in
connection with the Corporate Transaction, either to be assumed by the
successor corporation (or parent thereof) or to be replaced with a comparable
option to purchase shares of the capital stock of the successor corporation
(or parent thereof), or (ii) such option is to be replaced with a cash
incentive program of the successor corporation which preserves the spread
existing on the unvested option shares at the time of the Corporate
Transaction and provides for subsequent payout in accordance with the same
vesting schedule applicable to those option shares. The determination of
option comparability under clause (i) above shall be made by the Plan
Administrator, and its determination shall be final, binding and conclusive.

                  B. To the extent not previously exercised, this Option
shall terminate and cease to be exercisable upon the consummation of a
Corporate Transaction unless it is expressly assumed by the successor
corporation or parent thereof.

                  C. Option Shares available under any options which are
assumed or replaced in the Corporate Transaction and do not otherwise
accelerate at that time, shall automatically vest in full in the event the
Optionee's Service should subsequently terminated by reason of an Involuntary
Termination within twenty-four (24) months following the effective date of
such Corporate Transaction. Any options so accelerated shall remain
exercisable for fully-vested

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shares until the EARLIER of (i) the expiration of the option term or (ii) the
expiration of the one (1)-year period measured from the effective date of the
Involuntary Termination.

                  D. This Agreement shall not in any way affect the right of
the Corporation to adjust, reclassify, reorganize or otherwise make changes
in its capital or business structure or to merge, consolidate, dissolve,
liquidate or sell or transfer all or any part of its business or assets.

         7.       EFFECT OF CHANGE IN CONTROL

                  In the event of any Change in Control, Optionee shall
automatically vest in full with respect to all Option Shares so that each
such option shall, immediately prior to the effective date of the Change in
Control, be fully exercisable for any or all of Option Shares as fully-vested
shares of Common Stock.

         8.       ADJUSTMENT IN OPTION SHARES.

                  A. In the event any change is made to the Corporation's
outstanding Common Stock by reason of any stock split, stock dividend,
combination of shares, exchange of shares, or other change affecting the
outstanding Common Stock as a class without receipt of consideration, then
appropriate adjustments shall be made to (i) the total number of Option
Shares subject to this option, (ii) the number of Option Shares for which
this option is to be exercisable from and after each installment date
specified in the Grant Notice and (iii) the Option Price payable per share in
order to reflect such change and thereby preclude a dilution or enlargement
of benefits hereunder.

                  B. If this option is to be assumed in connection with a
Corporate Transaction described in Paragraph 6 or is otherwise to remain
outstanding, then this option shall be appropriately adjusted, immediately
after such Corporate Transaction, to apply and pertain to the number and
class of securities which would have been issuable to the Optionee in the
consummation of such Corporate Transaction had the option been exercised
immediately prior to such Corporate Transaction, and appropriate adjustments
shall also be made to the Option Price payable per share, provided the
aggregate Option Price payable hereunder shall remain the same.

         9.       PRIVILEGE OF STOCK OWNERSHIP.  The holder of this option
shall not have any of the rights of a shareholder with respect to the Option
Shares until such individual shall have exercised the option and paid the
Option Price.

         10.      MANNER OF EXERCISING OPTION.

                  A. In order to exercise this option with respect to all or
any part of the Option Shares for which this option is at the time
exercisable, Optionee (or in the case of exercise after Optionee's death, the
Optionee's executor, administrator, heir or legatee, as the case may be) must
take the following actions:

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                                    (i)     Execute and deliver to the Secretary
         of the Corporation a stock purchase agreement (the "Purchase
         Agreement") in substantially the form of Exhibit B to the Grant Notice.

                                    (ii)    Pay the aggregate Option Price
         for the purchased shares in one or more forms approved under the
         Plan.

                                    (iii)   Furnish to the Corporation
         appropriate documentation that the person or persons exercising the
         option, if other than Optionee, have the right to exercise this option.

                  B. For purposes of this Agreement, the Exercise Date shall
be the date on which the executed Purchase Agreement shall have been
delivered to the Corporation, and the fair market value of a share of Common
Stock on any relevant date shall be determined in accordance with
subparagraphs (i) through (iii) below:

                                    (i)     If the Common Stock is not at the
         time listed or admitted to trading on any stock exchange but is
         traded on the NASDAQ National Market System, the fair market value
         shall be the closing selling price of one share of Common Stock on
         the date in question, as such price is reported by the National
         Association of Securities Dealers through its NASDAQ system or any
         successor system. If there is no closing selling price for the
         Common Stock on the date in question, then the closing selling price
         on the last preceding date for which such quotation exists shall be
         determinative of fair market value.

                                    (ii)    If the Common Stock is at the
         time listed or admitted to trading on any stock exchange, then the
         fair market value shall be the closing selling price per share of
         Common Stock on the date in question on the stock exchange
         determined by the Plan Administrator to be the primary market for
         the Common Stock, as such price is officially quoted in the
         composite tape of transactions on such exchange. If there is no
         reported sale of Common Stock on such exchange on the date in
         question, then the fair market value shall be the closing selling
         price on the exchange on the last preceding date for which such
         quotation exists.

                                    (iii)   If the Common Stock at the time
         is neither listed nor admitted to trading on any stock exchange nor
         traded in the over-the-counter market, or if the Plan Administrator
         determines that the value determined pursuant to subparagraphs (i)
         and (ii) above does not accurately reflect the fair market value of
         the Common Stock, then such fair market value shall be determined by
         the Plan Administrator after taking into account such factors as the
         Plan Administrator shall deem appropriate.

                  C. As soon after the Exercise Date as practical, the
Corporation shall mail or deliver to Optionee or to the other person or
persons exercising this option a certificate or certificates representing the
shares so purchased and paid for, with the appropriate legends affixed
thereto.

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                  D. In no event may this option be exercised for any
fractional shares.

         11.      COMPLIANCE WITH LAWS AND REGULATIONS.

                  A. The exercise of this option and the issuance of Option
Shares upon such exercise shall be subject to compliance by the Corporation
and the Optionee with all applicable requirements of law relating thereto and
with all applicable regulations of any stock exchange on which shares of the
Corporation's Common Stock may be listed at the time of such exercise and
issuance.

                  B. In connection with the exercise of this option, Optionee
shall execute and deliver to the Corporation such representations in writing
as may be requested by the Corporation in order for it to comply with the
applicable requirements of Federal and State securities laws.

         12.      SUCCESSORS AND ASSIGNS. Except to the extent otherwise
provided in Paragraph 3 or 6, the provisions of this Agreement shall inure to
the benefit of, and be binding upon, the successors, administrators, heirs,
legal representatives and assigns of Optionee and the successors and assigns
of the Corporation.

         13.      LIABILITY OF CORPORATION.

                  A. If the Option Shares covered by this Agreement exceed,
as of the Grant Date, the number of shares of Common Stock which may without
shareholder approval be issued under the Plan, then this option shall be void
with respect to such excess shares, unless shareholder approval of an
amendment sufficiently increasing the number of shares of Common Stock
issuable under the Plan is obtained in accordance with the provisions of
Article IV, Section 3, of the Plan.

                  B. The inability of the Corporation to obtain approval from
any regulatory body having authority deemed by the Corporation to be
necessary to the lawful issuance and sale of any Common Stock pursuant to
this option shall relieve the Corporation of any liability with respect to
the non-issuance or sale of the Common Stock as to which such approval shall
not have been obtained. The Corporation, however, shall use its best efforts
to obtain all such approvals.

         14.      NOTICES. Any notice required to be given or delivered to
the Corporation under the terms of this Agreement shall be in writing and
addressed to the Corporation in care of the Corporate Secretary at its
principal corporate offices. Any notice required to be given or delivered to
Optionee shall be in writing and addressed to Optionee at the address
indicated below Optionee's signature line on the Grant Notice. All notices
shall be deemed to have been given or delivered upon personal delivery or
upon deposit in the U.S. mail, postage prepaid and properly addressed to the
party to be notified.

         15.      LOANS. The Plan Administrator may, in its absolute
discretion and without any obligation to do so, assist the Optionee in the
exercise of this option by (i) authorizing the

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extension of a loan to the Optionee from the Corporation or (ii) permitting
the Optionee to pay the option price for the purchased Common Stock in
installments over a period of years. The terms of any such loan or
installment method of payment (including the interest rate, the requirements
for collateral and the terms of repayment) shall be established by the Plan
Administrator in its sole discretion.

         16. CONSTRUCTION. This Agreement and the option evidenced hereby are
made and granted pursuant to the Plan and are in all respects limited by and
subject to the express terms and provisions of the Plan. All decisions of the
Plan Administrator with respect to any question or issue arising under the
Plan or this Agreement shall be conclusive and binding on all persons having
an interest in this option.

         17. GOVERNING LAW. The interpretation, performance, and enforcement
of this Agreement shall be governed by the laws of the State of Delaware
without resort to that State's conflict-of-laws rules.

         18. SHAREHOLDER APPROVAL. The grant of this option is subject to
approval of the Plan by the Corporation's shareholders within twelve (12)
months after the adoption of the Plan by the Board of Directors.
NOTWITHSTANDING ANY PROVISION OF THIS AGREEMENT TO THE CONTRARY, THIS OPTION
MAY NOT BE EXERCISED IN WHOLE OR IN PART UNTIL SUCH SHAREHOLDER APPROVAL IS
OBTAINED. In the event that such shareholder approval is not obtained, then
this option shall thereupon terminate in its entirety and the Optionee shall
have no further rights to acquire any Option Shares hereunder.

         19. ADDITIONAL TERMS APPLICABLE TO AN INCENTIVE STOCK OPTION. In the
event this option is designated an incentive stock option in the Grant
Notice, the following terms and conditions shall also apply to the grant:

                  A. This option shall cease to qualify for favorable tax
treatment as an incentive stock option under the Federal tax laws if (and to
the extent) this option is exercised for one or more Option Shares: (i) more
than three (3) months after the date the Optionee ceases to be an Employee
for any reason other than death or permanent disability (as defined in
Paragraph 5) or (ii) more than one (1) year after the date the Optionee
ceases to be an Employee by reason of permanent disability.

                  B. Should this option be designated as immediately
exercisable in the Grant Notice, then this option shall not become
exercisable in the calendar year in which granted if (and to the extent) the
aggregate fair market value (determined at the Grant Date) of the
Corporation's Common Stock for which this option would otherwise first become
exercisable in such calendar year would, when added to the aggregate fair
market value (determined as of the respective date or dates of grant) of the
Corporation's Common Stock for which this option or one or more other
incentive stock options granted to the Optionee prior to the Grant Date
(whether under the Plan or any other option plan of the Corporation or its
parent or subsidiary corporations) first become exercisable during the same
calendar year, exceed One Hundred Thousand Dollars ($100,000) in the
aggregate. To the extent the exercisability of this option is deferred by
reason of the foregoing limitation, the deferred portion will first become
exercisable

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in the first calendar year or years thereafter in which the One Hundred
Thousand Dollar ($100,000) limitation of this Paragraph 18.B would not be
contravened.

                  C. Should this option be designated as exercisable in
installments in the Grant Notice, then no installment under this option
(whether annual or monthly) shall qualify for favorable tax treatment as an
incentive stock option under the Federal tax laws if (and to the extent) the
aggregate fair market value (determined at the Grant Date) of the
Corporation's Common Stock for which such installment first becomes
exercisable hereunder will, when added to the aggregate fair market value
(determined as of the respective date or dates of grant) of the Corporation's
Common Stock for which one or more other incentive stock options granted to
the Optionee prior to the Grant Date (whether under the Plan or any other
option plan of the Corporation or any parent or subsidiary corporation) first
become exercisable during the same calendar year, exceed One Hundred Thousand
Dollars ($100,000) in the aggregate.

         20. WITHHOLDING. Optionee hereby agrees to make appropriate
arrangements with the Corporation or parent or subsidiary corporation
employing Optionee for the satisfaction of all Federal, State or local income
tax withholding requirements and Federal social security employee tax
requirements applicable to the exercise of this option.

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                                                                   EXHIBIT 10.25

                                                         IMMEDIATELY EXERCISABLE

                               DIGIRAD CORPORATION
                            STOCK PURCHASE AGREEMENT

         AGREEMENT made as of this ___ day of __________, 19__, by and among
Digirad Corporation, (the "Corporation"), ___________, the holder of a stock
option (the "Optionee") under the Corporation's 1998 Stock Option/Stock
Issuance Plan and ____________, the Optionee's spouse.

         I.       EXERCISE OF OPTION

                  1.1 EXERCISE. Optionee hereby purchases        shares
("Purchased Shares") of the Corporation's common stock ("Common Stock")
pursuant to that certain option ("Option") granted Optionee on _____________,
19___ ("Grant Date") to purchase up to ____________ shares of the Common
Stock ("Total Purchasable Shares") under the Corporation's 1998 Stock
Option/Stock Issuance Plan (the "Plan") at an option price of $__________ per
share ("Option Price").

                  1.2 PAYMENT. Concurrently with the delivery of this
Agreement to the Corporate Secretary of the Corporation, Optionee shall pay
the Option Price for the Purchased Shares in accordance with the provisions
of the agreement between the Corporation and Optionee evidencing the Option
(the "Option Agreement") and shall deliver whatever additional documents may
be required by the Option Agreement as a condition for exercise, together
with a duly-executed blank Assignment Separate from Certificate (in the form
attached hereto as Exhibit I) with respect to the Purchased Shares.

                  1.3 DELIVERY OF CERTIFICATES. The certificates representing
the Purchased Shares hereunder shall be held in escrow by the Corporate
Secretary of the Corporation in accordance with the provisions of Article VII.

                  1.4 SHAREHOLDER RIGHTS. Until such time as the Corporation
actually exercises its repurchase right, rights of first refusal or special
purchase right under this Agreement, Optionee (or any successor in interest)
shall have all the rights of a shareholder (including voting and dividend
rights) with respect to the Purchased Shares, including the Purchased Shares
held in escrow under Article VII, subject, however, to the transfer
restrictions of Article IV.

         II.      SECURITIES LAW COMPLIANCE

                  2.1 EXEMPTION FROM REGISTRATION. The Purchased Shares have
not been registered under the Securities Act of 1933, as amended (the "1933
Act"), and are accordingly being issued to Optionee in reliance upon the
exemption from such registration provided by Rule 701 of the Securities and
Exchange Commission for stock issuances under compensatory benefit

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plans such as the Plan. Optionee hereby acknowledges previous receipt of a
copy of the documentation for such Plan in the form of Exhibit C to the
Notice of Grant of Stock Option (the "Grant Notice") accompanying the Option
Agreement.

                  2.2 RESTRICTED SECURITIES.

                           A.       Optionee hereby confirms that Optionee
has been informed that the Purchased Shares are restricted securities under
the 1933 Act and may not be resold or transferred unless the Purchased Shares
are first registered under the Federal securities laws or unless an exemption
from such registration is available. Accordingly, Optionee hereby
acknowledges that Optionee is prepared to hold the Purchased Shares for an
indefinite period and that Optionee is aware that Rule 144 of the Securities
and Exchange Commission issued under the 1933 Act is not presently available
to exempt the sale of the Purchased Shares from the registration requirements
of the 1933 Act.

                           B.       Upon the expiration of the ninety
(90)-day period immediately following the date on which the Corporation first
becomes subject to the reporting requirements of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), the Purchased Shares, to the extent
vested under Article V, may be sold (without registration) pursuant to the
applicable requirements of Rule 144. If Optionee is at the time of such sale
an affiliate of the Corporation for purposes of Rule 144 or was such an
affiliate during the preceding three (3) months, then the sale must comply
with all the requirements of Rule 144 (including the volume limitation on the
number of shares sold, the broker/market-maker sale requirement and the
requisite notice to the Securities and Exchange Commission); however, the two
(2)-year holding period requirement of the Rule will not be applicable. If
Optionee is not at the time of the sale an affiliate of the Corporation nor
was such an affiliate during the preceding three (3) months, then none of the
requirements of Rule 144 (other than the broker/market-maker sale requirement
for Purchased Shares held for less than three (3) years following payment in
cash of the Option Price therefor) will be applicable to the sale.

                           C.       Should the Corporation not become subject
to the reporting requirements of the Exchange Act, then Optionee may,
provided he/she is not at the time an affiliate of the Corporation (nor was
such an affiliate during the preceding three (3) months), sell the Purchased
Shares (without registration) pursuant to paragraph (k) of Rule 144 after the
Purchased Shares have been held for a period of three (3) years following the
payment in cash of the Option Price for such shares.

                  2.3 DISPOSITION OF SHARES. Optionee hereby agrees that
Optionee shall make no disposition of the Purchased Shares (other than a
permitted transfer under paragraph 4.1) unless and until there is compliance
with all of the following requirements:

                           (a) Optionee shall have notified the Corporation of
         the proposed disposition and provided a written summary of the terms
         and conditions of the proposed disposition.

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                           (b) Optionee shall have complied with all
         require-ments of this Agreement applicable to the disposition of the
         Purchased Shares.

                           (c) Optionee shall have provided the Corporation with
         written assurances, in form and substance satisfactory to the
         Corporation, that (i) the proposed disposition does not require
         registration of the Purchased Shares under the 1933 Act or (ii) all
         appropriate action necessary for compliance with the registration
         requirements of the 1933 Act or of any exemption from registration
         available under the 1933 Act (including Rule 144) has been taken.

                           (d) Optionee shall have provided the Corporation with
         written assurances, in form and substance satisfactory to the
         Corporation, that the proposed disposition will not result in the
         contravention of any transfer restrictions applicable to the Purchased
         Shares pursuant to the provisions of the Commissioner Rules identified
         in paragraph 2.5.

                  The Corporation shall not be required (i) to transfer on
its books any Purchased Shares which have been sold or transferred in
violation of the provisions of this Article II nor (ii) to treat as the owner
of the Purchased Shares, or otherwise to accord voting or dividend rights to,
any transferee to whom the Purchased Shares have been transferred in
contravention of this Agreement.

                  2.4 RESTRICTIVE LEGENDS. In order to reflect the
restrictions on disposition of the Purchased Shares, the stock certificates
for the Purchased Shares will be endorsed with restrictive legends, including
one or more of the following legends:

                                    (i)     "The shares represented by this
certificate have not been registered under the Securities Act of 1933. The
shares may not be sold or offered for sale in the absence of (a) an effective
registration statement for the shares under such Act, (b) a 'no action'
letter of the Securities and Exchange Commission with respect to such sale or
offer, or (c) satisfactory assurances to the Corporation that registration
under such Act is not required with respect to such sale or offer."

                                    (ii)    "The shares represented by this
certificate are unvested and accordingly may not be sold, assigned,
transferred, encumbered, or in any manner disposed of except in conformity
with the terms of a written agreement dated ____________, 19__ between the
Corporation and the registered holder of the shares (or the predecessor in
interest to the shares). Such agreement grants certain repurchase rights and
rights of first refusal to the Corporation (or its assignees) upon the sale,
assignment, transfer, encumbrance or other disposition of the Corporation's
shares or upon termination of service with the Corporation. The Corporation
will upon written request furnish a copy of such agreement to the holder
hereof without charge."

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                  III.     SPECIAL TAX ELECTION

                  3.1 SECTION 83(b) ELECTION APPLICABLE TO THE EXERCISE OF A
NON-STATUTORY STOCK OPTION. If the Purchased Shares are acquired hereunder
pursuant to the exercise of a NON-STATUTORY STOCK OPTION, as specified in the
Grant Notice, then the Optionee understands that under Section 83 of the
Internal Revenue Code of 1986, as amended (the "Code"), the excess of the
fair market value of the Purchased Shares on the date any forfeiture
restrictions applicable to such shares lapse over the Option Price paid for
such shares will be reportable as ordinary income on such lapse date. For
this purpose, the term "forfeiture restrictions" includes the right of the
Corporation to repurchase the Purchased Shares pursuant to the Repurchase
Right provided under Article V of this Agreement. Optionee understands that
he/she may elect under Section 83(b) of the Code to be taxed at the time the
Purchased Shares are acquired hereunder, rather than when and as such
Purchased Shares cease to be subject to such forfeiture restrictions. Such
election must be filed with the Internal Revenue Service within thirty (30)
days after the date of this Agreement. Even if the fair market value of the
Purchased Shares at the date of this Agreement equals the Option Price paid
(and thus no tax is payable), the election must be made to avoid adverse tax
consequences in the future. THE FORM FOR MAKING THIS ELECTION IS ATTACHED AS
EXHIBIT II HERETO. OPTIONEE UNDERSTANDS THAT FAILURE TO MAKE THIS FILING
WITHIN THE THIRTY (30)-DAY PERIOD WILL RESULT IN THE RECOGNITION OF ORDINARY
INCOME BY THE OPTIONEE AS THE FORFEITURE RESTRICTIONS LAPSE.

                  3.2 CONDITIONAL SECTION 83(b) ELECTION APPLICABLE TO THE
EXERCISE OF AN INCENTIVE STOCK OPTION. If the Purchased Shares are acquired
hereunder pursuant to the exercise of an INCENTIVE STOCK OPTION under the
Federal tax laws, as specified in the Grant Notice, then the following tax
principles shall be applicable to the Purchased Shares:

                           A. For regular tax purposes, no taxable income
         will be recognized at the time the Option is exercised.

                           B. The excess of (i) the fair market value of the
         Purchased Shares on the date the Option is exercised or (if later) on
         the date any forfeiture restrictions applicable to the Purchased Shares
         lapse over (ii) the Option Price paid for the Purchased Shares will be
         includible in the Optionee's taxable income for alternative minimum tax
         purposes.

                           C. If the Optionee makes a disqualifying disposition
         of the Purchased Shares, then the Optionee will recognize ordinary
         income in the year of such disposition equal in amount to the excess of
         (i) the fair market value of the Purchased Shares on the date the
         Option is exercised or (if later) on the date any forfeiture
         restrictions applicable to the Purchased Shares lapse over (ii) the
         Option Price paid for the Purchased Shares. Any additional gain
         recognized upon the disqualifying disposition will be either short-term
         or long-term capital gain depending upon the period for which the
         Purchased Shares are held prior to the disposition.

                           D. For purposes of the foregoing, the term
         "forfeiture restrictions" will include the right of the Corporation to
         repurchase the Purchased Shares pursuant to

                                       4
<Page>

         the Repurchase Right provided under Article V of this Agreement. The
         term "disqualifying disposition" means any sale or other disposition
         (1/) of the Purchased Shares within two (2) years after the Grant Date
         or within one (1) year after the execution date of this Agreement.

                           E. In the absence of final Treasury Regulations
         relating to incentive stock options, it is not certain whether the
         Optionee may, in connection with the exercise of the Option for any
         Purchased Shares at the time subject to forfeiture restrictions, file a
         protective election under Section 83(b) of the Code which would limit
         (I) the Optionee's alternative minimum taxable income upon exercise and
         (II) the Optionee's ordinary income upon a disqualifying disposition,
         to the excess of (i) the fair market value of the Purchased Shares on
         the date the Option is exercised over (ii) the Option Price paid for
         the Purchased Shares. THE APPROPRIATE FORM FOR MAKING SUCH A PROTECTIVE
         ELECTION IS ATTACHED AS EXHIBIT II TO THIS AGREEMENT AND MUST BE FILED
         WITH THE INTERNAL REVENUE SERVICE WITHIN THIRTY (30) DAYS AFTER THE
         DATE OF THIS AGREEMENT. HOWEVER, SUCH ELECTION IF PROPERLY FILED WILL
         ONLY BE ALLOWED TO THE EXTENT THE FINAL TREASURY REGULATIONS PERMIT
         SUCH A PROTECTIVE ELECTION.

                  3.3 OPTIONEE ACKNOWLEDGES THAT IT IS OPTIONEE'S SOLE
RESPONSIBILITY, AND NOT THE CORPORATION'S, TO FILE A TIMELY ELECTION UNDER
SECTION 83(b), EVEN IF OPTIONEE REQUESTS THE CORPORATION OR ITS REPRESENTATIVES
TO MAKE THIS FILING ON HIS/HER BEHALF. This filing should be made by registered
or certified mail, return receipt requested, and Optionee must retain two (2)
copies of the completed form for filing with his or her State and Federal tax
returns for the current tax year and an additional copy for his or her records.

         IV.      TRANSFER RESTRICTIONS

                  4.1 RESTRICTION ON TRANSFER. Optionee shall not transfer,
assign, encumber or otherwise dispose of any of the Purchased Shares which
are subject to the Corporation's Repurchase Right under Article V. In
addition, Purchased Shares which are released from the Repurchase Right shall
not be transferred, assigned, encumbered or otherwise made the subject of
disposition in contravention of the Corporation's First Refusal Right under
Article VI. Such restrictions on transfer, however, shall not be applicable
to (i) a gratuitous transfer of the Purchased Shares made to the Optionee's
spouse or issue, including adopted children, or to a trust for the exclusive
benefit of the Optionee or the Optionee's spouse or issue, PROVIDED AND ONLY
IF the Optionee obtains the Corporation's prior written consent to such
transfer, (ii) a

----------------------
         (1/) Generally, a disposition of shares purchased under an incentive
stock option includes any transfer of legal title, including a transfer by sale,
exchange or gift, but does not include a transfer to the Optionee's spouse, a
transfer into joint ownership with right of survivorship if Optionee remains one
of the joint owners, a pledge, a transfer by bequest or inheritance or certain
tax free exchanges permitted under the Code.

                                       5
<Page>

transfer of title to the Purchased Shares effected pursuant to the Optionee's
will or the laws of intestate succession or (iii) a transfer to the
Corporation in pledge as security for any purchase-money indebtedness
incurred by the Optionee in connection with the acquisition of the Purchased
Shares.

                  4.2 TRANSFEREE OBLIGATIONS. Each person (other than the
Corporation) to whom the Purchased Shares are transferred by means of one of
the permitted transfers specified in paragraph 4.1 must, as a condition
precedent to the validity of such transfer, acknowledge in writing to the
Corporation that such person is bound by the provisions of this Agreement and
that the transferred shares are subject to (i) both the Corporation's
Repurchase Right and the Corporation's First Refusal Right granted hereunder
and (ii) the market stand-off provisions of paragraph 4.4, to the same extent
such shares would be so subject if retained by the Optionee.

                  4.3 DEFINITION OF OWNER. For purposes of Articles IV, V, VI
and VII of this Agreement, the term "Owner" shall include the Optionee and
all subsequent holders of the Purchased Shares who derive their chain of
ownership through a permitted transfer from the Optionee in accordance with
paragraph 4.1.

                  4.4 MARKET STAND-OFF PROVISIONS.

                           A.       In connection with any underwritten
public offering by the Corporation of its equity securities pursuant to an
effective registration statement filed under the 1933 Act, including the
Corporation's initial public offering, Owner shall not sell, make any short
sale of, loan, hypothecate, pledge, grant any option for the purchase of, or
otherwise dispose or transfer for value or otherwise agree to engage in any
of the foregoing transactions with respect to, any Purchased Shares without
the prior written consent of the Corporation or its underwriters. Such
limitations shall be in effect for such period of time from and after the
effective date of such registration statement as may be requested by the
Corporation or such underwriters; PROVIDED, however, that in no event shall
such period exceed one hundred-eighty (180) days. The limitations of this
paragraph 4.4 shall remain in effect for the two-year period immediately
following the effective date of the Corporation's initial public offering and
shall thereafter terminate and cease to have any force or effect.

                           B.       Owner shall be subject to the market
stand-off provisions of this paragraph 4.4 PROVIDED AND ONLY IF the officers
and directors of the Corporation are also subject to similar arrangements.

                           C.       In the event of any stock dividend, stock
split, recapitalization or other change affecting the Corporation's
outstanding Common Stock effected as a class without receipt of
considera-tion, then any new, substituted or additional securities
distributed with respect to the Purchased Shares shall be immediately subject
to the provisions of this paragraph 4.4, to the same extent the Purchased
Shares are at such time covered by such provisions.

                           D.       In order to enforce the limitations of
this paragraph 4.4, the Corporation may impose stop-transfer instruc-tions
with respect to the Purchased Shares until the end of the applicable
stand-off period.

                                       6
<Page>

         V.       REPURCHASE RIGHT

                  5.1 GRANT. The Corporation is hereby granted the right (the
"Repurchase Right"), exercisable at any time during the sixty (60)-day period
following the date the Optionee ceases for any reason to remain in Service or
(if later) during the sixty (60)-day period following the execution date of
this Agreement, to repurchase at the Option Price all or (at the discretion
of the Corporation and with the consent of the Optionee) any portion of the
Purchased Shares in which the Optionee has not acquired a vested interest in
accordance with the vesting provisions of paragraph 5.3 (such shares to be
hereinafter called the "Unvested Shares"). For purposes of this Agreement,
the Optionee shall be deemed to remain in Service for so long as the Optionee
continues to render periodic services to the Corporation or any parent or
subsidiary corporation, whether as an employee, a non-employee member of the
board of directors, or an independent contractor or consultant.

                  5.2 EXERCISE OF THE REPURCHASE RIGHT. The Repurchase Right
shall be exercisable by written notice delivered to the Owner of the Unvested
Shares prior to the expiration of the applicable sixty (60)-day period
specified in paragraph 5.1. The notice shall indicate the number of Unvested
Shares to be repurchased and the date on which the repurchase is to be
effected, such date to be not more than thirty (30) days after the date of
notice. To the extent one or more certificates representing Unvested Shares
may have been previously delivered out of escrow to the Owner, then Owner
shall, prior to the close of business on the date specified for the
repurchase, deliver to the Secretary of the Corporation the certificates
representing the Unvested Shares to be repurchased, each certificate to be
properly endorsed for transfer. The Corporation shall, concurrently with the
receipt of such stock certificates (either from escrow in accordance with
paragraph 7.3 or from Owner as herein provided), pay to Owner in cash or cash
equivalents (including the cancellation of any purchase-money indebtedness),
an amount equal to the Option Price previously paid for the Unvested Shares
which are to be repurchased.

                  5.3 TERMINATION OF THE REPURCHASE RIGHT. The Repurchase
Right shall terminate with respect to any Unvested Shares for which it is not
timely exercised under paragraph 5.2. In addition, the Repurchase Right shall
terminate, and cease to be exercisable, with respect to any and all Purchased
Shares in which the Optionee vests in accordance with the vesting schedule
specified in the Grant Notice. All Purchased Shares as to which the
Repurchase Right lapses shall, however, continue to be subject to (i) the
First Refusal Right of the Corporation and its assignees under Article VI,
(ii) the market stand-off provisions of paragraph 4.4 and (iii) the Special
Purchase Right under Article VIII.

                  5.4 AGGREGATE VESTING LIMITATION. If the Option is
exercised in more than one increment so that the Optionee is a party to one
or more other Stock Purchase Agreements ("Prior Purchase Agreements") which
are executed prior to the date of this Agreement, then the total number of
Purchased Shares as to which the Optionee shall be deemed to have a
fully-vested interest under this Agreement and all Prior Purchase Agreements
shall not exceed in the aggregate the number of Purchased Shares in which the
Optionee would otherwise at the time be vested, in accordance with the
vesting provisions of paragraph 5.3, had all the Purchased Shares been
acquired exclusively under this Agreement.

                                       7
<Page>

                  5.5 FRACTIONAL SHARES. No fractional shares shall be
repurchased by the Corporation. Accordingly, should the Repurchase Right
extend to a fractional share (in accordance with the vesting provisions of
paragraph 5.3) at the time the Optionee ceases Service, then such fractional
share shall be added to any fractional share in which the Optionee is at such
time vested in order to make one whole vested share no longer subject to the
Repurchase Right.

                  5.6 ADDITIONAL SHARES OR SUBSTITUTED SECURITIES. In the
event of any stock dividend, stock split, recapitalization or other change
affecting the Corporation's outstanding Common Stock as a class effected
without receipt of consideration, then any new, substituted or additional
securities or other property (including money paid other than as a regular
cash dividend) which is by reason of any such transaction distributed with
respect to the Purchased Shares shall be immediately subject to the
Repurchase Right, but only to the extent the Purchased Shares are at the time
covered by such right. Appropriate adjustments to reflect the distribution of
such securities or property shall be made to the number of Purchased Shares
and Total Purchasable Shares hereunder and to the price per share to be paid
upon the exercise of the Repurchase Right in order to reflect the effect of
any such transaction upon the Corporation's capital structure; provided,
however, that the aggregate purchase price shall remain the same.

                  5.7 CORPORATE TRANSACTION.

                           A.       The Repurchase Rights shall automatically
terminate and cease to be exercisable upon the consummation of any Corporate
Transaction, provided that such repurchase right shall not terminate if and
to the extent the Repurchase Rights are assigned to the successor corporation
(or parent thereof) in connection with such Corporate Transaction.

                           B.       Repurchase rights which are assigned in
connection with a Corporate Transaction shall be exercisable with respect to
the property issued to the Optionee upon consummation of such Corporate
Transaction in exchange for the Common Stock held by the Optionee subject to
the repurchase rights immediately prior to the Corporate Transaction.

                           C.       Any Repurchase Rights which are assigned
in a Corporate Transaction and do not otherwise become vested at that time,
shall automatically terminate and cease to be exercisable in the event the
Optionee's Service should subsequently terminate by reason of an Involuntary
Termination within twenty-four (24) months following the effective date of
such Corporate Transaction.

                           D.       This Agreement shall not in any way
affect the right of the Corporation to adjust, reclassify, reorganize or
otherwise make changes in its capital or business structure or to merge,
consolidate, dissolve, liquidate or sell or transfer all or any part of its
business or assets.

         VI.      RIGHT OF FIRST REFUSAL

                  6.1 GRANT. The Corporation is hereby granted rights of
first refusal (the "First Refusal Right"), exercisable in connection with any
proposed transfer of the Purchased Shares in

                                       8
<Page>

which the Optionee has vested in accordance with the vesting provisions of
Article V. For purposes of this Article VI, the term "transfer" shall include
any sale, assignment, pledge, encumbrance or other disposition for value of
the Purchased Shares intended to be made by the Owner, but shall not include
any of the permitted transfers under paragraph 4.1.

                  6.2 NOTICE OF INTENDED DISPOSITION. In the event the Owner
desires to accept a bona fide third-party offer for the transfer of any or
all of the Purchased Shares (the shares subject to such offer to be
hereinafter called the "Target Shares"), Owner shall promptly (i) deliver to
the Corporate Secretary of the Corporation written notice (the "Disposition
Notice") of the terms and conditions of the offer, including the purchase
price and the identity of the third-party offeror, and (ii) provide
satisfactory proof that the disposition of the Target Shares to such
third-party offeror would not be in contravention of the provisions set forth
in Articles II and IV of this Agreement.

                  6.3 EXERCISE OF RIGHT. The Corporation shall, for a period
of forty-five (45) days following receipt of the Disposition Notice, have the
right to repurchase any or all of the Target Shares specified in the
Disposition Notice upon the same terms and conditions specified therein or
upon terms and conditions which do not materially vary from those specified
therein. Such right shall be exercisable by delivery of written notice (the
"Exercise Notice") to Owner prior to the expiration of the forty-five
(45)-day exercise period. If such right is exercised with respect to all the
Target Shares specified in the Disposition Notice, then the Corporation (or
its assignees) shall effect the repurchase of the Target Shares, including
payment of the purchase price, not more than ten (10) business days after
delivery of the Exercise Notice; and at such time Owner shall deliver to the
Corporation the certificates repre-senting the Target Shares to be
repurchased, each certificate to be properly endorsed for transfer. To the
extent any of the Target Shares are at the time held in escrow under Article
VII, the certificates for such shares shall automatically be released from
escrow and delivered to the Corporation for purchase. Should the purchase
price specified in the Disposition Notice be payable in property other than
cash or evidences of indebtedness, the Corporation (or its assignees) shall
have the right to pay the purchase price in the form of cash equal in amount
to the value of such property. If the Owner and the Corporation (or its
assignees) cannot agree on such cash value within ten (10) days after the
Corporation's receipt of the Disposition Notice, the valuation shall be made
by an appraiser of recognized standing selected by the Owner and the
Corporation (or its assignees) or, if they cannot agree on an appraiser
within twenty (20) days after the Corporation's receipt of the Disposition
Notice, each shall select an appraiser of recognized standing and the two
appraisers shall designate a third appraiser of recognized standing, whose
appraisal shall be determinative of such value. The cost of such appraisal
shall be shared equally by the Owner and the Corporation. The closing shall
then be held on the later of (i) the tenth business day following delivery of
the Exercise Notice or (ii) the tenth business day after such cash valuation
shall have been made.

                  6.4 NON-EXERCISE OF RIGHT. In the event the Exercise Notice
is not given to Owner within forty-five (45) days following the date of the
Corporation's receipt of the Disposition Notice, Owner shall have a period
of thirty (30) days thereafter in which to sell or otherwise dispose of the
Target Shares to the third-party offeror identified in the Disposition Notice
upon terms and conditions (including the purchase price) no more favorable to
such third-

                                       9
<Page>

party offeror than those specified in the Disposition Notice; provided,
however, that any such sale or disposition must not be effected in
contravention of the provisions of Article II of this Agreement. To the
extent any of the Target Shares are at the time held in escrow under Article
VII, the certificates for such shares shall automatically be released from
escrow and surrendered to the Owner. The third-party offeror shall acquire
the Target Shares free and clear of the Corporation's Repurchase Right under
Article V and the Corporation's First Refusal Right hereunder, but the
acquired shares shall remain subject to (i) the securities law restrictions
of paragraph 2.2(a) and (ii) the market stand-off provisions of paragraph
4.4. In the event Owner does not effect such sale or disposition of the
Target Shares within the specified thirty (30)-day period, the Corporation's
First Refusal Right shall continue to be applicable to any subsequent
disposition of the Target Shares by Owner until such right lapses in
accordance with paragraph 6.7.

                  6.5 PARTIAL EXERCISE OF RIGHT. In the event the Corporation
(or its assignees) makes a timely exercise of the First Refusal Right with
respect to a portion, but not all, of the Target Shares specified in the
Disposition Notice, Owner shall have the option, exercisable by written
notice to the Corporation delivered within thirty (30) days after the date of
the Disposition Notice, to effect the sale of the Target Shares pursuant to
one of the following alternatives:

                                    (i)     sale or other disposition of all the
         Target Shares to the third-party offeror identified in the Disposition
         Notice, but in full compliance with the requirements of paragraph 6.4,
         as if the Corporation did not exercise the First Refusal Right
         hereunder; or

                                    (ii)    sale to the Corporation (or its
         assignees) of the portion of the Target Shares which the Corporation
         (or its assignees) has elected to purchase, such sale to be effected in
         substantial conformity with the provisions of paragraph 6.3.

                           Failure of Owner to deliver timely notification to
the Corporation under this paragraph 6.5 shall be deemed to be an election by
Owner to sell the Target Shares pursuant to alternative (i) above.

                  6.6 RECAPITALIZATION/MERGER.

                           (a)      In the event of any stock dividend, stock
split, recapitalization or other transaction affecting the Corporation's
outstanding Common Stock as a class effected without receipt of
consideration, then any new, substituted or additional securities or other
property which is by reason of such transaction distributed with respect to
the Purchased Shares shall be immediately subject to the Corporation's First
Refusal Right hereunder, but only to the extent the Purchased Shares are at
the time covered by such right.

                           (b)      In the event of any of the following
transactions:

                                            (i)      a merger or consolidation
         in which the Corporation is not the surviving entity,

                                       10
<Page>

                                            (ii)     a sale, transfer or other
         disposition of all or substantially all of the Corporation's assets,

                                            (iii)    a reverse merger in which
         the Corporation is the surviving entity but in which the Corporation's
         outstanding voting securities are transferred in whole or in part to
         person or persons other than those who held such securities immediately
         prior to the merger, or

                                            (iv)     any transaction effected
         primarily to change the State in which the Corporation is incorporated,
         or to create a holding company structure,

                                    the Corporation's First Refusal Right
shall remain in full force and effect and shall apply to the new capital
stock or other property received in exchange for the Purchased Shares in
consummation of the transaction but only to the extent the Purchased Shares
are at the time covered by such right.

                  6.7 LAPSE. The First Refusal Right under this Article VI
shall lapse and cease to have effect upon the earliest to occur of (i) the
first date on which shares of the Corporation's Common Stock are held of
record by more than five hundred (500) persons, (ii) a determination is made
by the Corporation's Board of Directors that a public market exists for the
outstanding shares of the Corporation's Common Stock, or (iii) a firm
commitment underwritten public offering pursuant to an effective registration
statement under the 1933 Act, covering the offer and sale of the
Corporation's Common Stock in the aggregate amount of at least $5,000,000.
However, the market stand-off provisions of paragraph 4.4 shall continue to
remain in full force and effect following the lapse of the First Refusal
Right hereunder.

         VII.     ESCROW

                  7.1 DEPOSIT. Upon issuance, the certificates for any
Unvested Shares purchased hereunder shall be deposited in escrow with the
Corporate Secretary of the Corporation- to be held in accordance with the
provisions of this Article VII. Each deposited certificate shall be
accompanied by a duly-executed Assignment Separate from Certificate in the
form of Exhibit I. The deposited certificates, together with any other assets
or securities from time to time deposited with the Corporate Secretary
pursuant to the requirements of this Agreement, shall remain in escrow until
such time or times as the certificates (or other assets and securities) are
to be released or otherwise surrendered for cancellation in accordance with
paragraph 7.3. Upon delivery of the certificates (or other assets and
securities) to the Corporate Secretary of the Corporation, the Owner shall be
issued an instrument of deposit acknowledging the number of Unvested Shares
(or other assets and securities) delivered in escrow.

                  7.2 RECAPITALIZATION. All regular cash dividends on the
Unvested Shares (or other securities at the time held in escrow) shall be
paid directly to the Owner and shall not be held in escrow. However, in the
event of any stock dividend, stock split, recapitalization or other change
affecting the Corporation's outstanding Common Stock as a class effected
without receipt of consideration or in the event of a Corporate Transaction,
any new, substituted or additional

                                      11
<Page>

securities or other property which is by reason of such transaction
distributed with respect to the Unvested Shares shall be immediately
delivered to the Corporate Secretary to be held in escrow under this Article
VII, but only to the extent the Unvested Shares are at the time subject to
the escrow requirements of paragraph 7.1.

                  7.3 RELEASE/SURRENDER. The Unvested Shares, together with
any other assets or securities held in escrow hereunder, shall be subject to
the following terms and conditions relating to their release from escrow or
their surrender to the Corporation for repurchase and cancellation:

                                    (i)     Should the Corporation (or its
         assignees) elect to exercise the Repurchase Right under Article V with
         respect to any Unvested Shares, then the escrowed certificates for such
         Unvested Shares (together with any other assets or securities issued
         with respect thereto) shall be delivered to the Corporation
         concurrently with the payment to the Owner, in cash or cash equivalent
         (including the cancellation of any purchase-money indebtedness), of an
         amount equal to the aggregate Option Price for such Unvested Shares,
         and the Owner shall cease to have any further rights or claims with
         respect to such Unvested Shares (or other assets or securities
         attributable to such Unvested Shares).

                                    (ii)    Should the Corporation (or its
         assignees) elect to exercise its First Refusal Right under Article VI
         with respect to any vested Target Shares held at the time in escrow
         hereunder, then the escrowed certificates for such Target Shares
         (together with any other assets or securities attributable thereto)
         shall, concurrently with the payment of the paragraph 6.3 purchase
         price for such Target Shares to the Owner, be surrendered to the
         Corporation, and the Owner shall cease to have any further rights or
         claims with respect to such Target Shares (or other assets or
         securities).

                                    (iii)   Should the Corporation (or its
         assignees) elect not to exercise its First Refusal Right under Article
         VI with respect to any Target Shares held at the time in escrow
         hereunder, then the escrowed certificates for such Target Shares
         (together with any other assets or securities attributable thereto)
         shall be surrendered to the Owner for disposition in accordance with
         provisions of paragraph 6.4.

                                    (iv)    As the interest of the Optionee in
         the Unvested Shares (or any other assets or securities attributable
         thereto) vests in accordance with the provisions of Article V, the
         certificates for such vested shares (as well as all other vested assets
         and securities) shall be released from escrow and delivered to the
         Owner in accordance with the following schedule:

                                            a.       The initial release of
                vested shares (or other vested assets and securities) from
                escrow shall be effected within thirty (30) days following the
                expiration of the initial twelve (12)-month period measured from
                the Grant Date.

                                      12
<Page>

                                            b.       Subsequent releases of
                vested shares (or other vested assets and securities) from
                escrow shall be effected at semi-annual intervals thereafter,
                with the first such semi-annual release to occur eighteen (18)
                months after the Grant Date.

                                            c.       Upon the Optionee's
                cessation of Service, any escrowed Purchased Shares (or other
                assets or securities) in which the Optionee is at the time
                vested shall be promptly released from escrow.

                                            d.       Upon any earlier
                termination of the Corporation-'s Repurchase Right in accordance
                with the applicable provisions of Article V, any Purchased
                Shares (or other assets or securities) at the time held in
                escrow hereunder shall promptly be released to the Owner as
                fully-vested shares or other property.

                                    (v)     All Purchased Shares (or other
         assets or securities) released from escrow in accordance with the
         provisions of subparagraph (iv) above shall nevertheless remain subject
         to (I) the Corporation's First Refusal Right under Article VI until
         such right lapses pursuant to paragraph 6.7, (II) the market stand-off
         provisions of paragraph 4.4 until such provisions terminate in
         accordance therewith and (III) the Special Purchase Right under Article
         VIII.

         VIII.  MARITAL DISSOLUTION OR LEGAL SEPARATION

                  8.1 GRANT. In connection with the dissolution of the
Optionee's marriage or the legal separation of the Optionee and the
Optionee's spouse, the Corporation shall have the right (the "Special
Purchase Right"), exercisable at any time during the thirty (30)-day period
following the Corporation's receipt of the required Dissolution Notice under
paragraph 8.2, to purchase from the Optionee's spouse, in accordance with the
provisions of paragraph 8.3, all or any portion of the Purchased Shares which
would otherwise be awarded to such spouse in settlement of any community
property or other marital property rights such spouse may have in such shares.

                  8.2 NOTICE OF DECREE OR AGREEMENT. The Optionee shall
promptly provide the Secretary of the Corporation with written notice (the
"Dissolution Notice") of (i) the entry of any judicial decree or order
resolving the property rights of the Optionee and the Optionee's spouse in
connection with their marital dissolu-tion or legal separation or (ii) the
execution of any contract or agreement relating to the distribution or
division of such property rights. The Dissolution Notice shall be accompanied
by a copy of the actual decree of dissolution or settlement agreement between
the Optionee and the Optionee's spouse which provides for the award to the
spouse of one or more Purchased Shares in settlement of any community
property or other marital property rights such spouse may have in such shares.

                  8.3 EXERCISE OF SPECIAL PURCHASE RIGHT. The Special
Purchase Right shall be exercisable by delivery of written notice (the
"Purchase Notice") to the Optionee and the Optionee's spouse within thirty
(30) days after the Corporation's receipt of the Dissolution Notice. The
Purchase Notice shall indicate the number of shares to be purchased by the

                                       13
<Page>

Corporation, the date such purchase is to be effected (such date to be not
less than five (5) business days, nor more than ten (10) business days, after
the date of the Purchase Notice), and the fair market value to be paid for
such Purchased Shares. The Optionee (or the Optionee's spouse, to the extent
such spouse has physical possession of the Purchased Shares) shall, prior to
the close of business on the date specified for the purchase, deliver to the
Corporate Secretary of the Corporation the certificates representing the
shares to be purchased, each certificate to be properly endorsed for
transfer. To the extent any of the shares to be purchased by the Corporation
are at the time held in escrow under Article VII, the certificates for such
shares shall be promptly delivered out of escrow to the Corporation. The
Corporation shall, concurrently with the receipt of the stock certificates,
pay to the Optionee's spouse (in cash or cash equivalents) an amount equal to
the fair market value specified for such shares in the Purchase Notice.

                           If the Optionee's spouse does not agree with the
fair market value specified for the shares in the Purchase Notice, then the
spouse shall promptly notify the Corporation in writing of such disagreement
and the fair market value of such shares shall thereupon be determined by an
appraiser of recognized standing selected by the Corporation and the spouse.
If they cannot agree on an appraiser within twenty (20) days after the date
of the Purchase Notice, each shall select an appraiser of recognized
standing, and the two appraisers shall designate a third appraiser of
recognized standing whose appraisal shall be determinative of such value. The
cost of the appraisal shall be shared equally by the Corporation and the
Optionee's spouse. The closing shall then be held on the fifth business day
following the completion of such appraisal; PROVIDED, however, that if the
appraised value is more than fifteen percent (15%) greater than the fair
market value specified for the shares in the Purchase Notice, the Corporation
shall have the right, exercisable prior to the expiration of such five
(5)-business-day period, to rescind the exercise of the Special Purchase
Right and thereby revoke its election to purchase the shares awarded to the
spouse.

                  8.4 LAPSE. The Special Purchase Right under this Article
VIII shall lapse and cease to have effect upon the earlier to occur of (i)
the first date on which the First Refusal Right under Article VI lapses or
(ii) the expiration of the thirty (30)-day exercise period specified in
paragraph 8.3, to the extent the Special Purchase Right is not timely
exercised in accordance with such paragraph.

         IX.      GENERAL PROVISIONS

                  9.1 ASSIGNMENT. The Corporation may assign its Repurchase
Right under Article V, its First Refusal Right under Article VI and/or its
Special Purchase Right under Article VIII to any person or entity selected by
the Corporation's Board of Directors, including (without limitation) one or
more shareholders of the Corporation.

                           If the assignee of the Repurchase Right is other
than a one hundred percent (100%) owned subsidiary corporation of the
Corporation or the parent corporation owning one hundred percent (100%) of
the Corporation, then such assignee must make a cash payment to the
Corporation, upon the assignment of the Repurchase Right, in an amount equal
to the excess (if any) of (i) the fair market value of the Unvested Shares at
the time subject to the

                                      14
<Page>

assigned Repurchase Right over (ii) the aggregate repurchase price payable
for the Unvested Shares thereunder.

                  9.2 DEFINITIONS. For purposes of this Agreement, the
following provisions shall be applicable in determining the parent and
subsidiary corporations of the Corporation:

                                    (i)     Any corporation (other than the
         Corporation) in an unbroken chain of corporations ending with the
         Corporation shall be considered to be a parent corporation of the
         Corporation, provided each such corporation in the unbroken chain
         (other than the Corporation) owns, at the time of the determination,
         stock possessing fifty percent (50%) or more of the total combined
         voting power of all classes of stock in one of the other corporations
         in such chain.

                                    (ii)    Each corporation (other than the
         Corporation) in an unbroken chain of corporations beginning with the
         Corporation shall be considered to be a subsidiary of the Corporation,
         provided each such corporation (other than the last corporation) in the
         unbroken chain owns, at the time of the determination, stock possessing
         fifty percent (50%) or more of the total combined voting power of all
         classes of stock in one of the other corporations in such chain.

                  9.3 NO EMPLOYMENT OR SERVICE CONTRACT. Nothing in this
Agreement or in the Plan shall confer upon the Optionee any right to continue
in the Service of the Corporation (or any parent or subsidiary corporation of
the Corporation employing or retaining Optionee) for any period of specific
duration or interfere with or otherwise restrict in any way the rights of the
Corporation (or any parent or subsidiary corporation of the Corporation
employing or retaining Optionee) or the Optionee, which rights are hereby
expressly reserved by each, to terminate the Optionee's Service at any time
for any reason whatsoever, with or without cause.

                  9.4 NOTICES. Any notice required in connection with (i) the
Repurchase Right, the Special Purchase Right or the First Refusal Right or
(ii) the disposition of any Purchased Shares covered thereby shall be given
in writing and shall be deemed effective upon personal delivery or upon
deposit in the United States mail, registered or certified, postage prepaid
and addressed to the party entitled to such notice at the address indicated
below such party's signature line on this Agreement or at such other address
as such party may designate by ten (10) days advance written notice under
this paragraph 9.4 to all other parties to this Agreement.

                  9.5 NO WAIVER. The failure of the Corporation (or its
assignees) in any instance to exercise the Repurchase Right granted under
Article V, or the failure of the Corporation (or its assignees) in any
instance to exercise the First Refusal Right granted under Article VI, or the
failure of the Corporation (or its assignees) in any instance to exercise the
Special Purchase Right granted under Article VIII shall not constitute a
waiver of any other repurchase rights and/or rights of first refusal that may
subsequently arise under the provisions of this Agreement or any other
agreement between the Corporation and the Optionee or the Optionee's spouse.
No waiver of any breach or condition of this Agreement shall be deemed to be
a waiver of any other or subsequent breach or condition, whether of like or
different nature.

                                       15
<Page>

                  9.6 CANCELLATION OF SHARES. If the Corporation (or its
assignees) shall make available, at the time and place and in the amount and
form provided in this Agreement, the consideration for the Purchased Shares
to be repurchased in accordance with the provisions of this Agreement, then
from and after such time, the person from whom such shares are to be
repurchased shall no longer have any rights as a holder of such shares (other
than the right to receive payment of such consideration in accordance with
this Agreement), and such shares shall be deemed purchased in accordance with
the applicable provisions hereof and the Corporation (or its assignees) shall
be deemed the owner and holder of such shares, whether or not the
certificates therefor have been delivered as required by this Agreement.

         X.       MISCELLANEOUS PROVISIONS

                  10.1 OPTIONEE UNDERTAKING. Optionee hereby agrees to take
whatever additional action and execute whatever additional documents the
Corporation may in its judgment deem necessary or advisable in order to carry
out or effect one or more of the obligations or restrictions imposed on
either the Optionee or the Purchased Shares pursuant to the express
provisions of this Agreement.

                  10.2 AGREEMENT IS ENTIRE CONTRACT. This Agreement
constitutes the entire contract between the parties hereto with regard to the
subject matter hereof. This Agreement is made pursuant to the provisions of
the Plan and shall in all respects be construed in conformity with the
express terms and provisions of the Plan.

                  10.3 GOVERNING LAW. This Agreement shall be governed by,
and construed in accordance with, the laws of the State of Delaware, as such
laws are applied to contracts entered into and performed in such State
without resort to that State's conflict-of-laws rules.

                  10.4 COUNTERPARTS. This Agreement may be executed in
counterparts, each of which shall be deemed to be an original, but all of
which together shall constitute one and the same instrument.

                  10.5 SUCCESSORS AND ASSIGNS. The provisions of this
Agreement shall inure to the benefit of, and be binding upon, the Corporation
and its successors and assigns and the Optionee and the Optionee's legal
representatives, heirs, legatees, distributees, assigns and transferees by
operation of law, whether or not any such person shall have become a party to
this Agreement and have agreed in writing to join herein and be bound by the
terms and conditions hereof.

                  10.6 POWER OF ATTORNEY. Optionee's spouse hereby appoints
Optionee his or her true and lawful attorney in fact, for him or her and in
his or her name, place and stead, and for his or her use and benefit, to
agree to any amendment or modification of this Agreement and to execute such
further instruments and take such further actions as may reasonably be
necessary to carry out the intent of this Agreement. Optionee's spouse
further gives and grants unto Optionee as his or her attorney in fact full
power and authority to do and perform every act necessary and proper to be
done in the exercise of any of the foregoing powers as fully as he or she
might or could do if personally present, with full power of substitution and
revocation,

                                      16
<Page>

hereby ratifying and confirming all that Optionee shall lawfully do and cause
to be done by virtue of this power of attorney.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                      17
<Page>

                  IN WITNESS WHEREOF, the parties have executed this Agreement
on the day and year first indicated above.

                                       DIGIRAD CORPORATION

                                       By:
                                            ------------------------------
                                       Title:
                                              ----------------------------
                        Address:
                                       -----------------------------------

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

                                       -----------------------------------
                                                    Optionee (*/)

         Address:

         The undersigned spouse of Optionee has read and hereby approves the
foregoing Stock Purchase Agreement. In consider-ation of the Corporation's
granting the Optionee the right to acquire the Purchased Shares in accordance
with the terms of such Agreement, the undersigned hereby agrees to be
irrevocably bound by all the terms and provisions of such Agreement, including
(specifically) the right of the Corporation (or its assignees) to purchase any
and all interest or right the undersigned may otherwise have in such shares
pursuant to community property laws or other marital property rights.

                                            -----------------------------------
                                            Optionee's Spouse

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

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

-------------------
(*/) I have executed the Section 83(b) election that was attached hereto as an
Exhibit. As set forth in Article III, I understand and I, and NOT the
Corporation, will be responsible for completing the form and filing the election
with the appropriate office of the Federal and State tax authorities and that if
such filing is not completed within thirty (30) days after the date of this
Agreement, I will not be entitled to the tax benefits provided by Section 83(b)

<Page>

                                    EXHIBIT I

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

                  FOR VALUE RECEIVED ________________ hereby sell(s), assign(s)
and transfer(s) unto Digirad Corporation (the "Corporation"), ____________
(________) shares of the Common Stock of the Corporation standing in his\her
name on the books of the Corporation represented by Certificate No.
__________________ and do hereby irrevocably constitute and appoint___________as
Attorney to transfer the said stock on the books of the Corporation with full
power of substitution in the premises.

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

                                            Signature
                                                     --------------------------

INSTRUCTION: Please do not fill in any blanks other than the signature line. The
purpose of this assignment is to enable the Corporation to exercise its
Repurchase Right set forth in the Agreement without requiring additional
signatures on the part of the Optionee.

<Page>

                                                               REPURCHASE RIGHTS

                                   EXHIBIT II

                           SECTION 83(b) TAX ELECTION

This statement is being made under Section 83(b) of the Internal Revenue Code,
pursuant to Treas. Reg. Section 1.83-2.

(1)      The taxpayer who performed the services is:

         Name:
         Address:
         Taxpayer Ident. No.:

(2)      The property with respect to which the election is being made is
         _______ shares of the common stock of Digirad Corporation.

(3)      The property was issued on ______________, 19__.

(4)      The taxable year in which the election is being made is the calendar
         year 19__.

(5)      The property is subject to a repurchase right pursuant to which the
         issuer has the right to acquire the property at the original purchase
         price if for any reason taxpayer's employment with the issuer is
         terminated. The issuer's repurchase right lapses in a series of annual
         and monthly installments over a four year period ending on _________,
         19__ .

(6)      The fair market value at the time of transfer (determined without
         regard to any restriction other than a restriction which by its terms
         will never lapse) is $ ______ per share.

(7)      The amount paid for such property is $ _______ per share.

(8)      A copy of this statement was furnished to Digirad Corporation for whom
         taxpayer rendered the services underlying the transfer of property.

(9)      This statement is executed as of: ____________________.

-----------------                  ----------------------
Spouse (if any)                         Taxpayer

This form must be filed with the Internal Revenue Service Center with which
taxpayer files his/her Federal income tax returns. The filing must be made
within 30 days after the execution date of the Stock Purchase Agreement.

<Page>

         SPECIAL PROTECTIVE ELECTION PURSUANT TO SECTION 83(b) OF THE
INTERNAL REVENUE CODE WITH RESPECT TO PROPERTY ACQUIRED UPON EXERCISE OF AN
INCENTIVE STOCK OPTION

The property described in the above Section 83(b) election is comprised of
shares of common stock acquired pursuant to the exercise of an incentive
stock option under Section 422 of the Code. Accordingly, it is the intent of
the Taxpayer to utilize this election to achieve the following tax results:

                  1. The purpose of this election is to have the alternative
minimum taxable income attributable to the purchased shares measured by the
amount by which the fair market value of such shares at the time of their
transfer to the Taxpayer exceeds the purchase price paid for the shares. In
the absence of this election, such alternative minimum taxable income would
be measured by the spread between the fair market value of the purchased
shares and the purchase price which exists on the various lapse dates in
effect for the forfeiture restric-tions applicable to such shares. The
election is to be effective to the full extent permitted under the Internal
Revenue Code.

                  2. Section 421(a)(1) of the Code expressly excludes from
income any excess of the fair market value of the purchased shares over the
amount paid for such shares. Accordingly, this election is also intended to
be effective in the event there is a "disqualifying disposition" of the
shares, within the meaning of Section 421(b) of the Code, which would
otherwise render the provisions of Section 83(a) of the Code applicable at
that time. Consequently, the Taxpayer hereby elects to have the amount of
disqualifying disposition income measured by the excess of the fair market
value of the purchased shares on the date of transfer to the Taxpayer over
the amount paid for such shares. Since Section 421(a) presently applies to
the shares which are the subject of this Section 83(b) election, no taxable
income is actually recognized for regular tax purposes at this time, and no
income taxes are payable, by the Taxpayer as a result of this election.

This form should be filed with the Internal Revenue Service Center with which
taxpayer files his/her Federal income tax returns. The filing must be made
within 30 days after the execution date of the Stock Purchase Agreement.

         NOTE: PAGE 2 SHOULD BE ATTACHED ONLY IF YOU ARE EXERCISING AN INCENTIVE
STOCK OPTION.

                                      21

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