Document:

<PAGE>
                                                                Exhibit - 10.238

CATERPILLAR FINANCIAL SERVICES CORPORATION                         FINANCE LEASE

                                             Dated as of
                                                        ------------------------

LESSEE:  MEADOW VALLEY CONTRACTORS, INC.

ADDRESS: 4411 S. 40TH ST.
         PHOENIX, AZ 85040

LESSOR:  CATERPILLAR FINANCIAL SERVICES CORPORATION

ADDRESS: 2120 West End Avenue
         Nashville, TN 37203

Lessor, in reliance on Lessee's selection of the equipment described below
("Unit" or Units"), agrees to acquire and lease the Units to Lessee, and Lessee
agrees to lease the Units from Lessor, subject to the terms and conditions
below and on the reverse side:

<TABLE>
<CAPTION>
DESCRIPTION OF UNIT(S)                                  SERIAL#   MONTHLY RENT  FINAL PAYMENT
----------------------                                  --------  ------------  -------------
<S>                    <C>                              <C>        <C>          <C>
(1) USED  140H         Caterpillar Motor Grader         2ZK02772    $2,950.77    $28,000.00
                                                                   [ILLEGIBLE]
</TABLE>

RENT TO BE PAID: in arrears (starts one month after Delivery Date) and every
month thereafter.

Lease Term:  36 Months        Utilization Date: May 25, 2003

The [   ] Mandatory Final Payment (Section 13) [ X ] Optional Final Payment
(Section 14) is applicable to this Lease (check one)

Location of Unit(s): 4411 SO. 40TH ST.
                     PHOENIX, AZ 85040, MARICOPA

ADDITIONAL PROVISIONS:                               RIDERS:

                              TERMS AND CONDITIONS

  1. LEASE TERM: The lease term for each Unit shall start on its Delivery Date
(the date (a) Lessor executes this Lease, (b) Lessor takes title to the Unit, or
(c) Lessee or its agent takes control of physical possession of the Unit,
whichever is latest), provided the Delivery Date is on or before the utilization
date stated above, and shall continue for the number of months stated above. If
the Delivery Date is not on or before the utilization date, Lessee shall, at the
option of Lessor, assume Lessor's obligations to purchase and pay for the Unit.
Lessee shall execute and send Lessor's delivery supplement to Lessor promptly
after delivery of a Unit.

  2. RENT: Lessee shall pay to Lessor, at PO Box 100647 Pasadena, CA 91189-0647
or such other location Lessor designates in writing, rent for each Unit as
stated above starting (a) on its Delivery Date if the rent is to be paid in
advance, or (b) one month (or other period as stated above) after its Delivery
Date if the rent is to be paid in arrears. An amount equal to the first rent
payment for each Unit must accompany this document when it is submitted to
Lessor. If Lessor executes this document, the amount shall be the first rent
payment. If Lessor does not execute this document, the amount shall be returned
to Lessee. If Lessor does not receive a rent payment on the date it is due,
Lessee shall pay to Lessor, on demand, a late payment charge equal to five
percent (5%) of the rent payment not paid when due or the highest charge allowed
by law, whichever is less.

  3. NO ABATEMENT: Lessee shall not be entitled to abatement or reduction of
rent or setoff against rent for any reason whatsoever. Except as otherwise
provided, this Lease shall not terminate because of, nor shall the obligations
of Lessor or Lessee be affected by damage to, any defect in, destruction of, or
loss of possession or use of a Unit, the attachment of any lien, security
interest or other claim to a Unit; any interference with Lessee's use of a Unit;
Lessee's insolvency or the commencement of any bankruptcy or similar proceeding
by or against Lessee, or any other cause whatsoever.

  4. DISCLAIMER OF WARRANTIES: Lessee acknowledges and agrees that Lessor is not
the manufacturer of the Unit(s) and that Lessee has selected each Unit based on
Lessee's own judgment without any reliance whatsoever on any statements or
representations made by Lessor. AS BETWEEN LESSOR AND LESSEE, THE UNIT(S) ARE
PROVIDED "AS IS" WITHOUT ANY WARRANTIES OF ANY KIND. LESSOR HEREBY EXPRESSLY
DISCLAIMS a) ALL WARRANTIES OF MERCHANTABILITY, b) ALL WARRANTIES OF FITNESS FOR
A PARTICULAR PURPOSE, AND c) ALL WARRANTIES AGAINST INFRINGEMENT OR THE LIKE.
Lessor assigns to Lessee its interest in any of the manufacturer's warranties on
the Unit(s).

  5. POSSESSION, USE AND MAINTENANCE: Lessee shall not (a) use, operate,
maintain or store a Unit improperly, carelessly, unsafely or in violation of any
applicable law or regulation or for any purpose other than in the conduct of
Lessee's business; (b) abandon a Unit; (c) sublease a Unit, permit the use of a
Unit by anyone other than Lessee, change the use of unit from that specified in
the Application Survey/Usage Rider attached hereto, or change the location of a
Unit from that specified above, without the prior written consent of Lessor; or
(d) create or allow to exist any lien, claim, security interest or encumbrance
on any of its rights hereunder or a Unit. A Unit is and shall remain personal
property regardless of its use or manner of attachment to realty. Lessor and its
agent shall have the right (but not the obligation) to inspect a Unit and
maintenance records relating to it and observe its use. Lessee, at its expense,
shall maintain each Unit in good operating order, repair and condition and shall
perform maintenance at least as frequently as stated in any applicable
operator's guide, service manual, or lubrication and maintenance guide. Lessee
shall not alter any Unit or affix any accessory or equipment to it if doing so
will impair its originally intended function or use or reduce its value. Any
alteration or addition to a Unit shall be the responsibility of and at the sole
risk of Lessee. All parts, accessories and equipment affixed to a Unit shall be
subject to the security interest of Lessor.

              SEE REVERSE SIDE FOR ADDITIONAL TERMS AND CONDITIONS

Lessee: MEADOW VALLEY CONTRACTORS, INC.

By /s/ Kenneth D. Nelson
   ----------------------------------------------

Name (PRINT) /s/ Kenneth D. Nelson
             ------------------------------------

Title Vice President
      -------------------------------------------

Date  3-
     --------------------------------------------

Lessor: CATERPILLAR FINANCIAL SERVICES CORPORATION

By
   ----------------------------------------------

Name (PRINT)
            -------------------------------------

Title
     --------------------------------------------

Date
    ---------------------------------------------
<PAGE>
  6.  TAXES: Lessee shall promptly pay or reimburse Lessor for all fees, charges
and taxes of any nature, including, without limitation, personal property taxes,
together with any penalties, fines or additions to tax and interest thereon
(collectively, "Taxes") levied on or assessed against Lessor in connection with
the ownership, leasing, rental, sale, possession, purchase, or use of a Unit;
excluding, however, all charges or taxes on or measured by Lessor's net income,
or charges or taxes levied on or assessed against Lessor in connection with a
Unit after the Unit is returned to Lessor in accordance with the terms of this
Lease. If the reimbursement to Lessor of Taxes constitutes income for federal,
state or local tax purposes and if the Lessor is not entitled to a deduction for
the full amount of the reimbursement, the Lessee shall pay the Lessor an
additional amount such that the net amount received by Lessor after payment of
all related Taxes equals the amount which Lessor would have received if no such
Taxes were payable. Lessee shall prepare and timely file, in a manner
satisfactory to Lessor, any reports or returns which may be required with
respect to a Unit, including, without limitation, personal property tax returns.
For purposes of this section, in computing Lessor's Taxes attributable to a
reimbursement, it shall be assumed that the Lessor is in the highest marginal
tax rate applicable to corporations at the time the reimbursement is made, and
that the term "Lessor" shall include any affiliated group, within the meaning of
Section 1504 of the Internal Revenue Code of 1986, of which Lessor is a member
for any year in which a consolidated or combined income tax return is filed for
the affiliated group.

  7.  LOSS OR DAMAGE: Lessee shall bear the risk, of any Casualty Occurrence
(the Unit is worn out, lost, stolen, destroyed, taken by government action or,
in Lessor's opinion, irreparably damaged) or other damage from the time it is
purchased by Lessor until it is returned to Lessor. Lessee shall give Lessor
prompt notice of a Casualty Occurrence or other damage. If, in Lessor's opinion,
the damage is not a Casualty Occurrence, Lessee shall, at its expense, promptly
restore the Unit to the condition required by Section 5. If a Casualty
Occurrence, Lessee shall pay to Lessor on the first rent payment date following
the Casualty Occurrence (thirty (30) days after the Casualty Occurrence if there
is no rent payment date remaining) the lesser of (a) the sum of (i) all amounts
then due under this Lease with respect to the Unit, (ii) the present value of
all unpaid rent for the Unit, and (iii) the present value of the Purchase Price
of the Unit as stated on the front hereof; or (b) the maximum amount permitted
by law. Present values will be determined by discounting at the implicit
interest rate of this Lease. Upon making this payment, the lease term with
respect to the Unit shall terminate and Lessee shall be entitled to possession
of the Unit and to any recovery in respect to it (subject to the rights of any
insurer).

  8.  WAIVER AND INDEMNITY: LESSEE HEREBY AGREES TO RELEASE, DEFEND, INDEMNIFY
AND HOLD HARMLESS LESSOR, ITS DIRECTORS, OFFICERS, EMPLOYEES, AGENTS AND ASSIGNS
FROM AND AGAINST ANY CLAIMS OF LESSEE OR THIRD PARTIES, INCLUDING CLAIMS BASED
UPON BREACH OF CONTRACT, BREACH OF WARRANTY, PERSONAL INJURY, PROPERTY DAMAGE,
STRICT LIABILITY OR NEGLIGENCE, FOR ANY LOSS, DAMAGE OR INJURY CAUSED BY OR
RELATING TO THE DESIGN, MANUFACTURE, SELECTION, DELIVERY, CONDITION, OPERATION,
USE, OWNERSHIP, MAINTENANCE OR REPAIR OF ANY UNIT. FURTHER, LESSEE AGREES TO BE
RESPONSIBLE FOR ALL COSTS AND EXPENSES, INCLUDING REASONABLE ATTORNEYS' FEES,
INCURRED BY LESSOR OR ITS DIRECTORS, OFFICERS, EMPLOYEES, AGENTS AND ASSIGNS IN
DEFENDING SUCH CLAIMS OR IN ENFORCING THIS PROVISION. UNDER NO CONDITION OR
CAUSE OF ACTION SHALL LESSOR BE LIABLE FOR ANY LOSS OF ACTUAL OR ANTICIPATED
BUSINESS OR PROFITS OR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES.

  9.  INSURANCE: Lessee, at its expense, shall keep each Unit insured for the
benefit of Lessor against all risks for not less than the amount described in
Section 7 and shall maintain comprehensive public liability insurance (including
product and broad form contractual liability) covering the Unit for not less
than $1,000,000 combined coverage for bodily injury and property damage. All
insurance shall be in a form and with companies as Lessor shall approve, shall
specify Lessor and Lessee as name insured, shall be primary, without the right
of contribution from any other insurance carried by Lessor, and shall provide
that the insurance may not be canceled or altered so as to affect the interest
of Lessor without at least to (10) days' prior written notice to Lessor. All
insurance covering loss or damage to a Unit shall name Lessor as loss payee.
Lessee shall not make adjustments with insurers except with Lessor's prior
written consent and hereby irrevocably appoints Lessor as Lessee's
attorney-in-fact to receive payment of and to endorse all checks, drafts and
other documents and to take any other actions necessary to pursue insurance
claims and recover payments if Lessee fails to do so. Lessee shall promptly
notify Lessor of any occurrence which may become the basis of a claim and shall
provide Lessor with all requested pertinent data. Lessee shall promptly deliver
to Lessor evidence of such insurance coverage.

  10.  EVENTS OF DEFAULT: Each of the following constitutes an event of default
("Event of Default"): (a) Lessee fails to make any payment when due: (b) any
representation or warranty to Lessor which is incorrect or misleading; (c)
Lessee fails to observe or perform any covenant, agreement or warranty made by
Lessee and the failure continues for ten (10) days after written notice to
Lessee; (d) any default occurs under any other agreement between Lessee and
Lessor or any affiliate of Lessor; (e) Lessee or any guarantor of this Lease
ceases to do business, becomes insolvent, makes an assignment for the benefit of
creditors or files any petition or action under any bankruptcy, reorganization,
insolvency or moratorium law, or any other law or laws for the relief of, or
relating to, debtors; (f) filing of any involuntary petition under any
bankruptcy statute against Lessee or any guarantor of this Lease, or appointment
of a receiver, trustee, custodian or similar official to take possession of the
properties of Lessee or any guarantor of this Lease, unless the petition or
appointment ceases to be in effect within thirty (30) days after filing or
appointment; and (g) breach or repudiation of a guaranty obtained by Lessor in
connection with this Lease.

  11.  REMEDIES: If an Event of Default occurs, Lessor may (a) proceed by court
action to enforce performance by Lessee of the covenants of this Lease or to
recover damages for their breach or (b) by notice in writing to Lessee terminate
this Lease, in which event Lessee shall remain liable as provided herein and
Lessor may do any one or more of the following: (i) declare the balance due (or
the maximum amount permitted by law if recovery of the entire balance due is
prohibited) with respect to each Unit immediately due and payable and recover
any additional damages and expenses sustained by Lessor due to breach of any
covenant, representation or warranty in this Lease other than for the payment of
rent; (ii) enforce the security interest granted herein; (iii) require Lessee to
return each Unit and additional security pursuant to Section 12; and (iv) enter
the premises where any Unit or additional security may be and take possession of
it without notice, liability or legal process. Lessee agrees to pay all charges,
costs, expenses and reasonable attorney's fees incurred by Lessor in enforcing
this Lease. Lessor has all rights given to a secured party by law. Lessor may
undertake commercially reasonable efforts to sell or release a Unit and
additional security, and the proceeds of any sale or re-lease shall be applied
in the following order: (i) to reimburse Lessor for all expenses of retaking,
holding, preparing for sale or re-lease and selling or re-leasing the Unit and
additional security, including any taxes, charges, costs, expenses and
reasonable attorney's fees incurred by Lessor; (ii) to pay Lessor all amounts
which under the terms of this Lease are due or have accrued as of the date of
Lessor's receipt of the proceeds; and (iii) to pay Lessor the balance due (or
the maximum amount permitted by law if recovery of the entire balance due is
prohibited) with respect to the Unit and additional security. Any surplus shall
be paid to the person entitled to it. Lessee shall promptly pay any deficiency
to Lessor. Lessee acknowledges that sales for cash or credit to a wholesaler,
retailer or user of a Unit or additional security are all commercially
reasonable. The remedies provided to Lessor shall be cumulative and shall be in
addition to all other remedies existing at law or in equity. If Lessee fails to
perform any of its obligations under this Lease, Lessor may perform the
obligations, and the expenses incurred by Lessor as a result shall be payable by
Lessee upon demand.

  12. RETURN OF UNIT: If Lessor shall rightfully demand possession of a Unit,
Lessee, at its expense, shall promptly deliver possession of the Unit to Lessor,
properly protected and in the condition required by Section 5, at the option of
Lessor, (a) to the premises of the nearest Caterpillar dealer selling equipment
of the same type as the Unit, or (b) on board a carrier named by Lessor and
shipping it, freight collect, to the destination designated by Lessor. If the
Unit is not in the condition required by Section 5, Lessee shall pay to Lessor,
on demand, all costs and expenses incurred by Lessor to bring the Unit into the
required condition.

  13.  MANDATORY FINAL PAYMENT. If the Mandatory Final Payment box is checked,
at the end of lease term with respect to a Unit, provided this Lease has not
been terminated with respect to it, Lessee shall pay the Final Payment stated on
the front hereof. Upon receipt of the Final Payment, and all other amounts due
under this Lease, plus an amount equal to any taxes due in connection with the
transfer of the Unit or the delivery of the bill of sale, Lessor shall deliver
to Lessee, upon request, a bill of sale without warranties except that the Unit
is free of all encumbrances of any person claiming through Lessor. Lessee shall
purchase the Unit "AS IS, WHERE IS, WITH ALL FAULTS."

  14.  OPTIONAL FINAL PAYMENT. If the Optional Final Payment box is checked and
if no Event of Default shall have occurred and be continuing, Lessee may, by
notice delivered to Lessor not less than sixty (60) days prior to the end of the
lease term with respect to a Unit, elect to pay the Final Payment stated on the
front. Payment of the Final Payment shall be due at the end of the lease term.
Upon payment of the Final Payment and all other amounts due under this Lease,
plus an amount equal to any taxes due in connection with the transfer of the
Unit or the delivery of the bill of sale. Lessor shall deliver to Lessee, upon
request, a bill of sale without warranties except that the Unit is free of all
encumbrances of any person claiming through Lessor. Lessee shall purchase the
Unit "AS IS, WHERE IS, WITH ALL FAULTS". If Lessee does not elect to pay the
Final Payment, Lessee, upon expiration of the lease term, shall return the Unit
to Lessor as provided in Section 12 and furnish Lessor with documentation, as
Lessor may reasonably request, conveying to Lessor all of Lessee's right, title
and interest in the Unit, free and clear of all liens, claims, security
interests and encumbrances other than those of Lessor.

  15.  SECURITY INTEREST; LESSEE REPRESENTATIONS: Unless applicable law provides
otherwise, title to a Unit shall remain in Lessor as security for the
obligations of Lessee hereunder until Lessee has fulfilled all of its
obligations. Lessee hereby grants to Lessor a continuing security interest in
the Unit, including all attachments, accessories and optional features therefor
(whether or not installed thereon) and all substitutions, replacements,
additions, and accessions thereto, and proceeds of all of the foregoing,
including, but not limited to, proceeds in the form of chattel paper to secure
the payment of all sums due hereunder. Lessee will, at its expense, do any act
and execute, acknowledge, deliver, file, register and record any documents which
Lessor deems desirable in its discretion to protect Lessor's security interest
in the Unit and Lessor's rights and benefits under this Lease. Lessee hereby
irrevocably appoints Lessor as Lessee's Attorney-in-Fact for the signing and
filing of such documents and authorizes Lessor to delegate these limited powers.
Lessee represents and warrants to Lessor that (a) Lessee has the power to make,
deliver and perform under this Lease, (b) the person executing and delivering
this Lease is authorized to do so on behalf of Lessee, and (c) this Lease
constitutes a valid obligation of Lessee, legally binding upon it and
enforceable in accordance with its terms. Lessee shall, during the lease term,
display in a prominent place on the Unit labels supplied by Lessor stating that
the Unit is leased from Lessor. Lessee further represents and warrants to Lessor
that Lessee is and shall remain a Corporation registered in the state of NV
("Business Location"); and Lessee will not change its form of business
organization or Business Location without prior written notice to Lessor.

  16.  ASSIGNMENT; COUNTERPARTS: The rights of Lessor under this Lease and title
to the Unit may be assigned by Lessor at any time. If notified by Lessor, Lessee
shall make all payments due under this Lease to the party designated in the
notice, without offset or deduction. No assignment of this Lease or any right or
obligation under it may be made by Lessee without the prior written consent of
Lessor. This Lease shall be binding upon and benefit Lessor and Lessee and their
respective successors and assigns. If this Lease is assigned by Lessor to a
partnership or trust, the term "Lessor" shall thenceforth mean and include the
partnership or trust and shall also include, for purposes of Sections 4, 5, 6,
7, 8 and 9, each partner in or beneficiary of the partnership or trust. Although
multiple counterparts of this document may be signed, only the counterpart
accepted, acknowledged and certified by Caterpillar Financial Services
Corporation on the signature page thereof as the original will constitute
original chattel paper.

  17.  EFFECT OF WAIVER; ENTIRE AGREEMENT; MODIFICATION OF LEASE; NOTICES: A
delay or omission by Lessor to exercise any right or remedy shall not impair any
right or remedy and shall not be construed as a waiver of any breach or default.
Any waiver or consent by Lessor must be in writing. This Lease completely states
the rights of Lessor and Lessee and supersedes all prior agreements with respect
to the Unit. No variation or modification of this Lease shall be valid unless in
writing. All notices shall be in writing, addressed to the other party at the
address stated on the front or at such other address as may hereafter be
furnished in writing.

  18.  APPLICABLE LAW, JURISDICTION AND JURY TRIAL WAIVER PROVISIONS: This
Agreement shall be governed by and construed under the laws of the State of
Tennessee, without giving effect to the conflict-of-laws principles thereof, and
Lessee hereby consents to the jurisdiction of any state or federal court located
within the State of Tennessee. THE PARTIES HERETO HEREBY WAIVE THE RIGHT TO
TRIAL BY JURY IN ANY ACTION ARISING OUT OF OR RELATED TO THIS AGREEMENT, THE
OBLIGATIONS OR THE COLLATERAL.

  19.  SEVERABILITY; SURVIVAL OF COVENANTS: If any provision of this Lease shall
be invalid under any law, it shall be deemed omitted but the remaining
provisions hereof shall be given effect. All obligations of Lessee under this
Lease shall survive the expiration or termination of this Lease to the extent
required for their full observance and performance.<PAGE>

                                                                    Exhibit 10.2

{LIPID SCIENCES INC LOGO]

                                  CONFIDENTIAL
                    SEPARATION AGREEMENT AND GENERAL RELEASE

            This Confidential Separation Agreement and General Release (this
"Agreement") between Lipid Sciences, Inc., a Delaware corporation (the
"Company"), and Jan Johansson (the "Employee") dated as of January 28, 2003 sets
forth the understanding and agreement between the Company and the Employee
regarding the terms and conditions of the Employee's separation of employment
with the Company. THE EMPLOYEE IS HEREBY ADVISED TO CONSULT WITH AN ATTORNEY
BEFORE SIGNING THIS AGREEMENT. In consideration of the mutual promises and
commitments made in this Agreement, and intending to be legally bound, the
Company on the one hand, and the Employee on the other hand, agree to the terms
set forth in this Agreement.

            1. Termination of Service. Effective as of the date of this
Agreement (the "Termination Date"), pursuant to Section 4 of the Employment
Agreement dated July 18, 2001 between the Company and the Employee (the
"Employment Agreement"), the Employment Agreement is hereby terminated and the
Employee's employment and other relationships of any kind and in any capacity
with the Company, its parent, subsidiaries and related corporations, and their
predecessors and successors (the "Related Organizations") are hereby terminated.
The Employee agrees and acknowledges that as of the Termination Date the
Employee's employment relationship with the Company and any of its Related
Organizations has ended, and that neither the Company nor any of its Related
Organizations has any obligation to hire, rehire or employ the Employee.

            2. Cooperation Period. The Employee agrees that, during the thirty
(30)-day period commencing on the Termination Date, the Employee shall make
himself available, to the extent requested by the Company, to assist, and
cooperate with, the Company and any Related Organization in connection with
matters related to the business or affairs of the Company.

            3. Accrued Amounts; Stock Option. On the Termination Date the
Company shall pay to the Employee a gross amount equal to $16,633.96,
representing 72 hours of accrued but unpaid salary and 101 hours of accrued but
unused paid time off, both of the foregoing as of the Termination Date, less
applicable payroll withholding deductions for taxes (including federal, FICA,
Medicare, state, local and unemployment compensation). The Employee acknowledges
and agrees that 55,215 shares of the Company's common stock subject to the
option granted to the Employee under the Company's Performance Equity Plan (the
"Option") is the total number of shares that will have vested and be exercisable
as of the date that is thirty (30) days following the Termination Date (service
termination date for purposes of the Option) and that the remaining shares
subject to the Option shall be forfeited as of such date.

            4. Severance Payments and Benefits.

                  (a) The Company shall continue to pay to the Employee his
salary, at the rate in effect as of the Termination Date, for a period of seven
(7) months commencing on the date that next follows the expiration of the
Revocation Period (as defined below) (the "Severance Period") in accordance with
the payroll practices of the
<PAGE>
Company then in effect (the "Severance Payments"). From the gross amount of the
Severance Payments, the Company will determine and withhold payroll deductions
for taxes (federal, FICA, Medicare, state, local and unemployment compensation).

                  (b) Commencing on the date that next follows the expiration of
the Revocation Period the Employee shall be entitled to continue participation
in the Company's employee benefit plans and programs at the Company's cost, to
the level the Executive participated in the plans and programs as of the
Termination Date, for a period that shall end on the earlier of the last day of
the Severance Period and the day that the Employee is entitled to comparable
employee benefits in the aggregate under plans or programs of a subsequent
employer.

                  (c) During the period commencing on the date that next follows
the expiration of the Revocation Period and continuing for five days (the
"Purchase Expiration Date"), the Employee shall be entitled to purchase for an
amount equal to $1,000 (the "Purchase Price") the Fujitsu laptop computer (LIPD
00076) that the Company issued to him in connection with the Employee's
employment with the Company. The Employee hereby acknowledges and agrees that in
order to make an effective election to purchase the computer pursuant to this
Section 4(c), the Company must receive the Purchase Price on or prior to the
Purchase Expiration Date.

                  (d) The first Severance Payment shall include an amount
representing paid time off that would have accrued during the thirty (30)-day
period following the Termination Date (amount equal to 13 hours of paid time
off).

                  (e) The Employee acknowledges and agrees that the Company's
obligations under Section 4 arise under this Agreement, are in consideration for
the Employee's signing of this Agreement, and constitute consideration to which
the Employee is not otherwise entitled.

            5. Return Flight. During the sixty (60)-day period following the
Termination Date, the Employee shall be entitled to payment of the cost of a
single one-way flight in economy class to Sweden, his home country (the "Return
Flight"). The Employee hereby acknowledges and agrees that in order to make an
effective election to receive payment of the Return Flight, the Employee must
contact the Company to make the Return Flight arrangement through the Company,
prior to the expiration of the sixty (60)-day period following the Termination
Date.

            6. General Release.

                  (a) When used in this Agreement, the term "Released Parties"
means the Company, any and all of its past and present, direct or indirect
parents, subsidiaries and affiliated corporations, companies, partnerships,
joint ventures, compensation plans, benefit plans and other entities, and its
past and present directors, trustees, advisers, including, members of the
Scientific Advisory Board and Viral Advisory Board of the Company, officers,
managers, partners, supervisors, employees, attorneys,

                                       2
<PAGE>
members, agents and consultants, and their predecessors, successors and assigns,
and all persons or entities acting by, with, through, under or in concert with
any of them.

                  (b) When used in this Agreement, the word "Claims" means: (i)
each and every claim, complaint, cause of action, grievance, demand, allegation,
or accusation, whether known or unknown, whether suspected or unsuspected, and
whether fixed, vested or contingent, and (ii) each and every promise, assurance,
contract, representation, obligation, guarantee, warranty, liability, right and
commitment of any kind, whether known or unknown, whether suspected or
unsuspected, and whether fixed, vested or contingent, and (iii) all forms of
relief, including, but not limited to, all costs, expenses, losses, damages,
debts, attorneys' fees, litigation costs and expenses and experts' fees, whether
known or unknown, whether suspected or unsuspected, and whether fixed, vested or
contingent.

                  (c) By signing this Agreement, the Employee expressly waives
all rights (to the extent the Employee has any rights) afforded by any statute
in any jurisdiction that limits the effect of a release with respect to unknown
Claims. The foregoing does not mean or imply that the Employee has, or would
have, any rights under any such statute in the absence of this waiver. The
Employee understands the significance of the Employee's release of unknown
Claims. Without limiting the scope of the foregoing, the Employee also agrees,
understands and recognizes that, by executing this Agreement, the Employee
hereby expressly waives any and all rights and benefits conferred upon the
Employee by the provisions of Section 1542 of the Civil Code of the State of
California, which provides as follows:

                  "A general release does not extend to claims which the
                  creditor does not know or suspect to exist in his favor at the
                  time of executing the release, which if known by him must have
                  materially affected his settlement with the debtor."

            THIS MEANS THAT (EXCEPT AS EXPRESSLY PROVIDED HEREIN) BY SIGNING
THIS AGREEMENT, THE EMPLOYEE WILL HAVE WAIVED ANY RIGHT THE EMPLOYEE MAY HAVE
HAD TO INITIATE ANY LEGAL ACTION OR MAKE ANY CLAIM AGAINST THE RELEASED PARTIES
BASED ON ANY ACTS OR OMISSIONS OF THE RELEASED PARTIES UP TO THE DATE OF SIGNING
OF THE AGREEMENT.

                  (d) In consideration of the promises of the Company set forth
in this Agreement, and intending to be legally bound, the Employee hereby
irrevocably releases and forever discharges all Released Parties of and from any
and all Claims that the Employee (on behalf of either the Employee or any other
person or persons) ever had or now has against any and all of the Released
Parties, or which the Employee (or the Employee's heirs, executors,
administrators or assigns or any of them) hereafter can, shall or may have
against any and all of the Released Parties, for or by reason of any cause,
matter, thing, omission, occurrence or event whatsoever from the date of the
Employee's birth to the date the Employee has signed this Agreement. The
Employee acknowledges and agrees that the Claims released under this Agreement
include, but are not limited to, (i) any and all Claims based on any law,
statute, or constitution or based on contract or in tort or on common law,
including, but not limited to, all Claims based on or arising under Title VII of
the Civil Rights Act of 1964, the Rehabilitation Act of 1973, the Americans

                                       3
<PAGE>
With Disability Act of 1990, the Civil Rights Act of 1866, the Civil Rights Act
of 1991, the Employee Retirement Income Security Act of 1974, the Family Medical
Leave Act of 1993, the California Fair Employment and Housing Act, the
California Workers' Compensation Act, the California Unruh and Ralph Civil
Rights Laws, the California Alcohol and Drug Rehabilitation Law, as each of the
foregoing is amended from time to time, and (ii) any and all Claims under any
grievance of complaint procedure of any kind, and (iii) any and all Claims based
on or arising out of or related to the Employee's recruitment by, employment
with, the termination of the Employee's employment with, the Employee's
performance of any services in any capacity for, or any business transaction
with, each or any of the Released Parties, and (iv) any and all Claims in
connection with, or arising from, any lawsuit or proceeding brought by any
person or entity other than the Employee (including, but not limited to, Claims
brought by any administrative agency, department or commission).

            7. ADEA Release. In consideration of the promises of the Company set
forth in this Agreement, the Employee hereby releases and discharges the
Released Parties from any and all Claims that the Employee may have against the
Released Parties arising under the U.S. Age Discrimination in Employment Act of
1967, as amended, and the applicable rules and regulations promulgated
thereunder ("ADEA"). The Employee acknowledges that the Employee understands
that the ADEA is a federal statute that prohibits discrimination on the basis of
age in employment, benefits and benefit plans. The Employee also understands
that, by signing this Agreement, the Employee is waiving all Claims against any
and all of the Released Parties released by this Agreement.

            By signing this Release, the Employee hereby acknowledges and
confirms the following:

                  (a)   The Employee is providing the release and discharge set
                        forth in this Agreement in exchange for consideration in
                        addition to anything of value to which the Employee is
                        already entitled.

                  (b)   The Employee was hereby advised by the Company in
                        writing to consult with an attorney of the Employee's
                        choice prior to signing this Agreement and to have such
                        attorney explain to the Employee the terms of this
                        Agreement including, without limitation, the terms
                        relating to his release of claims arising under the
                        ADEA.

                  (c)   The Employee has read this Agreement carefully and
                        completely and understands each of the terms thereof.

                  (d)   The Employee is aware that he has forty-five (45) days
                        in which to consider the terms of the release contained
                        in this Agreement. To the extent the Employee has
                        executed this Agreement within less than forty-five (45)
                        days after its delivery to the Employee, the Employee
                        hereby acknowledges that the Employee's decision to
                        execute this Agreement prior to the expiration of such
                        forty-five (45)-day period was entirely

                                       4
<PAGE>
                        voluntary. For a period of seven days following the
                        Employee's execution and delivery of this Agreement, the
                        Employee has the right to revoke the release contained
                        in this Agreement (the "Revocation Period") commencing
                        immediately following the date the Employee signs and
                        delivers this Agreement to the Company. The Revocation
                        Period shall expire at 5:00 p.m. California time on the
                        last day of the Revocation Period; provided, however,
                        that if such seventh day is not a business day, the
                        Revocation Period shall extend to 5:00 p.m. on the next
                        succeeding business day. No such revocation by the
                        Employee shall be effective unless it is in writing and
                        signed by the Employee and received by the Company prior
                        to the expiration of the Revocation Period.

                  (e)   As set forth in section 7(f)(1)(C) of the ADEA, as added
                        by the Older Workers Benefit Protection Act of 1990, the
                        Employee understands that the Employee is not waiving
                        any rights or Claims provided under ADEA that may arise
                        after this Agreement is executed by the Employee.

            8. Confidential Information. As used in this Agreement, the term
"Affiliated Companies" means the Company's clients, subcontractors and other
companies or individuals with which the Company carries on business or joint
enterprises. As used in this Agreement, the term "Confidential Information"
means any and all information disclosed, acquired or known to the Employee as a
result of employment with the Company or any of the Affiliated Companies,
including, without limitation, any information gathered or developed by the
Employee and relating to the business of the Company or any of the Affiliated
Companies. Confidential Information includes, without limitation, all documents
pertaining to the business of the Company or any of the Affiliated Companies,
including trade secrets, technical and financial information, data, designs,
systems drawings, proposals, client lists, client records, economic and
financial analysis, financial data, customer contracts, notes, memoranda, books,
correspondence, manuals, reports or research, whether developed by the Company
or any of the Affiliated Companies or developed by the Employee acting alone or
jointly with the Company or any of the Affiliated Companies, any product
development and ideas, apparatus as well as all other information, written,
oral, graphic or computerized relating to the business of the Company or any of
the Affiliated Companies, provided that such information was not publicly
disclosed by the Company or any of the Affiliated Companies or known to the
Employee before employment with the Company. The Employee represents and
warrants that the Employee shall at all times, including following the
termination of the Employee's employment with the Company, keep secret and
retain in strictest confidence all Confidential Information, and except as the
Employee may be authorized by the Company or Affiliated Companies in writing,
the Employee agrees not to publish or disclose to any person or entity, or use
in any manner, such Confidential Information. The Employee's obligations under
this Section 8 supplement, and do not limit or replace, any other obligations
that the Employee may have including, but not limited to, obligations under
statute, common law or contract.

                                       5
<PAGE>
            9. Return of Property to Company. Except as contemplated in Section
4(c), the Employee represents and warrants that the Employee has returned to the
Company all written, descriptive or tangible matter containing Confidential
Information, including all copies thereof, which was developed or compiled by
the Employee or made available to the Employee in the course of employment with
the Company, including without limitation, drawings, blueprints, tapes, disks,
codes, descriptions or other papers, documents or materials that contain any
such Confidential Information. Furthermore, the Employee represents and warrants
that the Employee has returned all Company property including, without
limitation, all computer (hardware and software) and business equipment,
drawings, designs, specifications, tapes, disks, codes, notes, memoranda or data
made available or furnished to the Employee by, or obtained by the Employee
from, the Company or any of the Affiliated Companies, and any copies thereof,
whether or not they contain Confidential Information.

            10. Full Satisfaction.

                  (a) The Employee acknowledges and agrees that, upon
satisfaction by the Company of its obligations under Section 4 and except as
forth in Section 10(b), the Employee has received all compensation and other
payments to which the Employee is or may be entitled by reason of the Employee's
employment or termination of employment with the Company and/or any of its
Related Organizations.

                  (b) Notwithstanding anything in this Agreement to the
contrary, the parties are not waiving or changing any rights, claims,
conditions, requirements, or defenses in connection with the following matters:
(i) the Employee's 401(k) account and; (ii) the reimbursement to the Employee of
reasonable and necessary business expenses incurred by the Employee on or before
the Termination Date, on behalf of the Company, and reported and properly
documented on expense reports, in accordance with and subject to the
requirements of the Company's expense reimbursement practices.

                  (c) The Employee warrants and agrees that no promise, other
than the promises in this Agreement, has been made to the Employee. The Employee
warrants and agrees that by signing this Agreement the Employee is not relying
upon any statement or representation made by or on behalf of the Released
Parties and each or any of them concerning the merits or value of any Claims or
concerning any other thing or matter. The Employee warrants and agrees that the
Employee is relying solely upon the Employee's own judgment and that before
signing this Agreement the Employee has read it.

            11. No Disclosure of Agreement. The Employee agrees to keep the
terms of this Agreement confidential. The Employee shall not disclose or
publicize the terms of this Agreement and the amount paid or agreed to be paid
pursuant to this Agreement to any person or entity, except to the Employee's
spouse, attorney, accountant, financial advisor and/or to a government agency
for the purpose of payment or collection of taxes or application for
unemployment compensation benefits.

            12. Non-Disparagement. The Employee covenants and agrees that the
Employee shall not make any statement, written or oral, in disparagement of the
Company or any of its officers, shareholders, directors, employees, agents, or
associates (including,

                                       6
<PAGE>
but not limited to, negative references to each or any of the Company's
products, services, or corporate policies) to the general public and/or the
Company's employees, potential employees, customers, suppliers, potential
suppliers, business partners, and/or potential business partners.

            13. No Admission. The Employee acknowledges and agrees that neither
the offer of this Agreement, nor the acceptance of this Agreement, nor the
Agreement itself is an admission, or shall be construed to be an admission, or
any wrongdoing or liability by each or any of the Released Parties; moreover,
any such liability or wrongdoing is denied by the Released Parties and each or
any of them. Neither the offer of this Agreement, nor any of its terms, shall be
admissible as evidence of any liability or wrongdoing by each or any of the
Released Parties in any judicial, administrative or other proceeding now pending
or hereafter instituted by any person or entity.

            14. Enforcement; Severability. All provisions and portions of this
Agreement are severable. If any provision or portion of this Agreement or the
application of any provision or portion of this Agreement to any person, to any
circumstance, or to any Claims, are determined to be invalid, void, voidable or
unenforceable to any extent for any reason, (a) the application of such
provision or portion of this Agreement to any other person, to any other
circumstance, or to any other Claims shall be unaffected thereby, and the
remaining provisions and portions of this Agreement also shall be unaffected
thereby; (b) all other provisions and portions of this Agreement shall remain in
full force and shall continue to be enforceable to the fullest and greatest
extent permitted by law; and (c) any provision or part of the Agreement found by
any Court with jurisdiction to be invalid, void, voidable or unenforceable, may
be construed or changed by the Court to the extent reasonably necessary to make
the provision or part (as construed or changed), valid, enforceable and binding.
The Employee acknowledges that a breach of any of the covenants contained in
Sections 8, 9, 11 and 12 will result in material irreparable injury to the
Company or any Related Organization for which there is no adequate remedy at
law, that it will not be possible to measure damages for such injuries precisely
and that, in the event of such a breach, the Company shall be entitled to obtain
a temporary restraining order and/or a preliminary or permanent injunction
without bond or other security, restraining the Employee from engaging in
activities prohibited by the applicable Sections or such other relief as may be
required to specifically enforce any of the covenants in the applicable Section.

            15. Governing Law. This Agreement is made and entered into by the
Company in the State of California. The Agreement shall in all respects be
governed by and interpreted under and in accordance with the laws of the State
of California. The breach of any promise in this Agreement by any party shall
not invalidate the Agreement or the release and shall not be a defense to the
enforcement of the Agreement against any party.

            16. Final Agreement. This Agreement and the Indemnification
Agreement dated as of November 29, 2001 between the Company and the Employee
constitute a complete and final agreement between the parties and supersede and
replace all prior or contemporaneous agreements, negotiations, or discussions
relating to the subject matter of this Agreement, including, without limitation,
the Employment Agreement. This Agreement shall not be modified or changed except
by written instrument executed by all parties.

                                       7
<PAGE>
            17. No Attorney Fees or Expenses. The Employee acknowledges and
agrees that the Company is not obligated to pay any of the Employee's attorneys'
fees, costs or expenses relating to this Agreement and that the release set
forth in this Agreement releases all Claims for attorneys' fees, costs and
expenses including, but not limited to experts' fees and all litigation costs
and expenses.

            18. Photocopies; Counterparts. All executed copies of this Agreement
and photocopies thereof shall have the same force and effect and shall be as
legally binding and enforceable as the original. This Agreement may be executed
in counterparts, each of which shall constitute a single instrument.

            19. Acceptance of Agreement. The Employee may accept this Agreement
by executing it and returning it to: Ms. Sandy Gardiner - Chief Accounting
Officer, Lipid Sciences, Inc., 7068 Koll Center Parkway, Suite 401, Pleasanton,
California 94566. The offer of this Agreement will be accepted by the Employee
upon actual receipt by the Company of the executed Agreement.

            20. Successors. This Agreement shall inure to the benefit of the
Company and its predecessors, successors and assigns, and to the benefit of the
Employee and the Employee's heirs, administrators and executors.

            21. This Agreement is being signed by the Employee and for the
Company with the intent to be legally bound.

<TABLE>
<S>                                       <C>
Dated:  March 14, 2003                          /s/ Jan Johansson
                                                ---------------------------------
                                                Jan Johansson

Dated:  March 17, 2003                    LIPID SCIENCES, INC.

                                          BY:   /s/ Sandra Gardiner
                                                -------------------------------
                                                Sandra Gardiner
                                                Chief Accounting Officer
</TABLE>

                                       8

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