Document:

<PAGE>
                                                                  EXHIBIT 10.2

                                 AMENDMENT NO. 2
                                       TO
                                CREDIT AGREEMENT

         Amendment No. 2 to CREDIT AGREEMENT dated as of September 28, 2004 (as
amended and modified prior to the date hereof, the "Loan Agreement"), among
BIOCREST MANUFACTURING, L.P., a Delaware limited partnership having its
principal office at 1834 State Highway 71 West, Cedar Creek, Texas 78612
("Customer"), STRATAGENE CORPORATION, a Delaware corporation (formerly known as
Stratagene Holding Corporation), having its principal office at 11011 North
Torrey Pines Road, La Jolla, California 92037 ("Stratagene"), BIOCREST HOLDINGS,
L.L.C., a Delaware limited liability company, having its principal office at
5320 Pine Meadow Road, Wilson, Wyoming 83014 ("BH LLC"), and MERRILL LYNCH
BUSINESS FINANCIAL SERVICES INC., a corporation organized and existing under the
laws of the State of Delaware having its principal office at 222 North LaSalle
Street, 17th Floor, Chicago, IL 60601 ("MLBFS").

         WHEREAS, MLBFS, Customer, Stratagene and BH LLC wish to amend the Loan
Agreement in certain respects,

         NOW, THEREFORE, in consideration of the premises and other good and
valuable consideration (the receipt and adequacy of which are hereby
acknowledged), the parties hereto hereby agree as follows:

         1. Definitions. All capitalized terms used herein which are defined in
the Loan Agreement and not otherwise defined herein are used herein as defined
therein.

         2. Amendments to Loan Agreement.

            (a) The definition of "Commitment Expiration Date" in Section 1.1 of
the Loan Agreement is hereby amended in its entirety to read as follows:

         "COMMITMENT EXPIRATION DATE" shall mean (i) the Maturity Date, in the
case of WCMA Revolving Loans, WCMA Reducing Revolving Loans and the WCMA LC Line
of Credit, (ii) January 23, 2004 in the case of the Term Loans or (iii) in each
case described in clause (i) and (ii), if earlier, the date on which the
commitments of MLBFS hereunder are terminated pursuant to Section 7.6.

<PAGE>
            (b) The definition of "Maturity Date" in Section 1.1 of the Loan
Agreement is hereby amended in its entirety to read as follows:

         "MATURITY DATE" shall mean (i) in the case of the WCMA Revolving Loans,
January 31, 2005 (subject to renewal in accordance with the terms hereof), (ii)
in the case of the WCMA Reducing Revolver, January 31, 2007, (iii) in the case
of the Term Loan, May 1, 2006, and (iv) in the case of the WCMA L/C Line of
Credit, July 31, 2005 (subject to renewal in accordance with the terms hereof).

            (c) The parenthetical definition of "Direct Pay Letter of Credit" in
clause (ii) of Section 6.1 of the Loan Agreement is hereby amended in its
entirety to read as follows:

         (as the same may be amended by the Issuing Bank, a "Direct Pay Letter
of Credit" and together with the Back to Back L/C, each a "Letter of Credit" and
collectively, the "Letters of Credit")

            (d) Section 6.4 of the Loan Agreement is hereby amended in its
entirety to read as follows:

         6.4 RENEWAL AT OPTION OF MLBFS; RIGHT OF CUSTOMER TO TERMINATE. MLBFS
may at any time, prior to January 31 in each year (beginning January 31, 2005),
in its sole discretion and at its sole option, renew the WCMA L/C Line of Credit
for an additional twelve month period ending on the next anniversary of the then
Maturity Date for the WCMA L/C Line of Credit; it being understood, however,
that no such renewal shall be effective unless set forth in a writing executed
by a duly authorized representative of MLBFS and delivered to Customer. Any such
renewal shall extend the Commitment Expiration Date for the WCMA L/C Line of
Credit to the next anniversary of such Commitment Expiration Date. Unless any
such renewal is accompanied by a proposed change in the terms of the WCMA L/C
Line of Credit (other than the extension of the Maturity Date), no such renewal
shall require Customer's approval. Customer shall, however, have the right to
terminate the WCMA L/C Line of Credit at any time upon written notice to MLBFS;
provided that no such termination shall affect any issued and outstanding Letter
of Credit or Customer's Obligations with respect thereto.

         3. Representations and Warranties. In order to induce MLBFS to enter
into this Amendment No. 2, Customer, Stratagene and BH LLC (with respect to
itself only) makes the following representations and warranties to MLBFS which
shall survive the execution and delivery hereof:

            (a) Each Business Credit Party is duly organized, validly existing
and in good standing under the laws of its state of organization. Each Business
Credit Party is qualified to do business and in good standing in each other
state where the nature of its business or the property owned by it make such
qualification necessary, except for such states where the failure to so qualify
or be in good standing would not have a Material Adverse Effect;

            (b) The execution and delivery of this Amendment No. 2 has been
authorized by all requisite action on the part of each Business Credit Party,
this Amendment No.

                                       2
<PAGE>
2 has been duly executed and delivered by it, and this Amendment No. 2 and the
Loan Agreement, as amended hereby constitute its legal, valid and binding
obligations enforceable in accordance with their respective terms subject to
applicable bankruptcy, insolvency, reorganization and other laws affecting
creditors' rights generally, moratorium laws from time to time in effect and
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law); and

            (c) No action of, or filing with, any governmental or public body or
authority is required to authorize, or is otherwise required in connection with
the execution, delivery and performance of this Amendment No. 2 by Customer,
Stratagene or BH LLC.

         4. Expenses. Customer shall pay all reasonable expenses, including,
without limitation, reasonable legal fees, incurred by MLBFS in connection with
the preparation, negotiation, execution and delivery and review of this
Amendment No. 2, and all other documents and instruments executed in connection
with this transaction.

         5. References to Loan Agreement. The Loan Agreement is, and shall
continue to be, in full force and effect and is hereby ratified and confirmed in
all respects except that after giving effect to this Amendment No. 2 all
references in the Loan Agreement to "this Agreement", "hereto", "hereof",
"hereunder" or words of like import referring to the Loan Agreement shall mean
the Loan Agreement, as amended.

         6. Amendment No. 2. This Amendment No. 2 is limited as written and
shall not be deemed (i) to be an amendment of or a consent under or waiver of
any other term or condition of the Loan Agreement, or any of the other Loan
Documents or (ii) to prejudice any right or rights which MLBFS now has or may
have in the future under or in connection with the Loan Agreement or the other
Loan Documents except as expressly waived hereby.

         7. Security Documents. It is agreed and confirmed that after giving
effect to this Amendment No. 2 that each Loan Document remains in full force and
effect.

         8. Governing Law. This Amendment No. 2, including the validity thereof
and the rights and obligations of the parties hereunder, shall be construed in
accordance with and governed by the laws of the State of Illinois.

         9. Counterparts. This Amendment No. 2 may be executed by one or more of
the parties to this Amendment No. 2 on any number of separate counterparts, and
all of said counterparts taken together shall be deemed to constitute one and
the same instrument.

        [REMAINDER OF PAGE INTENTIONALLY BLANK, SIGNATURES ON NEXT PAGE]

                                       3
<PAGE>
         IN WITNESS WHEREOF, the undersigned have executed this Amendment No. 2
this 29th day of September, 2004.

                                       MERRILL LYNCH BUSINESS
                                       FINANCIAL SERVICES INC.

                                       By:               /s/ PATRICK LUCAS
                                          --------------------------------------
                                           Name:  PATRICK LUCAS
                                           Title:  Vice President

                                       BIOCREST MANUFACTURING, L.P.

                                       By:      BioCrest Management, L.L.C.
                                       Its:     General Partner

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Sole Member

                                       STRATAGENE CORPORATION

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Chief Executive Officer

                                       BIOCREST HOLDINGS, L.L.C.

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Sole Manager

                                       The undersigned consent to the foregoing
                                       and acknowledge that the Loan Documents
                                       to which they are a party remain in full
                                       force and effect.

                                       STRATAGENE CALIFORNIA

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Chief Executive Officer

                                       4
<PAGE>
                                       BIOCREST CORPORATION

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Chief Executive Officer

                                       BIOCREST MANAGEMENT, L.L.C.

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Sole Manager

                                       BIOCREST LIMITED, L.L.C.

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Sole Manager

                                       PHENOGENEX, L.L.C.

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Sole Manager

                                       BIOCREST SALES, L.P.

                                       By:      BIOCREST MANAGEMENT, L.L.C.
                                       Its:     General Partner

                                       By:          /s/ JOSEPH A. SORGE, M.D.
                                          --------------------------------------
                                           Name:  JOSEPH A. SORGE, M.D.
                                           Title:  Sole Manager

                                       5<PAGE>

                                                                   EXHIBIT 10.30

                    THIRD AMENDED AND RESTATED LOAN AGREEMENT

THIS AMENDED AND RESTATED LOAN AGREEMENT ("Agreement") is made and entered into
as of July 1, 2004 by and between Sparta, Inc. a Delaware corporation
("Borrower"), and UNION BANK OF CALIFORNIA, N.A., a national banking association
("Bank"). This Agreement amends and restates in its entirety that certain loan
agreement dated as of September 22, 2003 by and between Borrower and Bank, as
amended.

                              SECTION 1. THE CREDIT

1.1   CREDIT FACILITIES

1.1.1 THE REVOLVING LOAN. Bank will loan to Borrower an amount not to exceed Six
Million Dollars ($6,000,000) outstanding in the aggregate at anyone time (the
"Revolving Loan"). The proceeds of the Revolving Loan shall be used for
Borrower's general working capital purposes. Borrower may borrow, repay and
reborrow all or part of the Revolving Loan in amounts of not less than Two
Hundred Fifty Thousand Dollars ($250,000) in accordance with the terms of the
Revolving Note (defined below). All borrowings of the Revolving Loan must be
made before July 2, 2007 at which time all unpaid principal and interest of the
Revolving Loan shall be due and payable. The Revolving Loan shall be evidenced
by Bank's standard form of commercial promissory note (the "Revolving Note").
Bank shall enter each amount borrowed and repaid in Bank's records and such
entries shall be deemed correct. Omission of Bank to make any such entries shall
not discharge Borrower of its obligation to repay in full with interest all
amounts borrowed.

As of the date of this Agreement, the principal amount outstanding under
Borrower's revolving loan with Bank evidenced by the promissory note dated
September 22, 2003 ("Old Note") shall be deemed the initial principal amount
outstanding under the Revolving Loan, and the Old Note is hereby cancelled and
superceded by the Revolving Note.

1.2 TERMINOLOGY. The following words and phrases, whether used in their singular
or plural form, shall have the meanings set forth below:

      "GAAP" means generally accepted accounting principles and practices
      consistently applied. Accounting terms used in this Agreement but not
      otherwise expressly defined have the meanings given them by GAAP.

      "LlC" means the Commercial LlCs or the Standby LlCs, or both, as the
      context may require.

      "Lien" means any voluntary or involuntary security interest, mortgage,
      pledge, claim, charge, encumbrance, title retention agreement, or third
      party interest, covering all or any part of the property of Borrower or
      any Guarantor.

      "Loan" means all the credit facilities described above.

      "Loan Documents" means this Agreement, the Note, and all other documents,
      instruments

<PAGE>

      and agreements required by Bank and executed in connection with this
      Agreement, the Note, the Loans, and with all other credit facilities from
      time to time made available to Borrower by Bank.

      "Note" means all the promissory notes described above.

1.3 PURPOSE OF LOAN. The proceeds of the Revolving Loan shall be used for
working capital and general corporate purposes.

1.4 PREPAYMENT. The Loan may be prepaid in full or in part but only in
accordance with the terms of the Note, and any such prepayment shall be subject
to any prepayment fee provided for therein. In the event of a principal
prepayment on any term indebtedness, the amount prepaid shall be applied to the
scheduled principal installments due in the reverse order of their maturity on
the Loan being prepaid.

1.5 INTEREST. The unpaid principal balance of the Loan shall bear interest at
the rate or rates provided in the Note.

1.6 DOCUMENTATION FEE. On or before the date of execution of this Agreement,
Borrower shall pay to Bank a documentation fee of Five Hundred Dollars ($500).

1.7 COMMITMENT FEE. On the last calendar day of the third month following the
execution of this Agreement and on the last calendar day of each three-month
period thereafter, Borrower shall pay to Bank a fee of one eighth of one percent
(.125%) per year on the unused portion of the Revolving Loan for the preceding
quarter, computed on the basis of a 360 day year for actual days elapsed.

1.8 BALANCES. Borrower shall maintain its major depository accounts with Bank
until all obligations of Borrower to Bank under the Loan Documents have been
paid in full.

1.9 DISBURSEMENT. Bank shall disburse the proceeds of the Loan as provided in
Bank's standard form Authorization to Disburse executed by Borrower.

1.10 SECURITY. Prior to any Loan disbursement, Borrower shall execute one or
more security agreements on Bank's standard form, and one or more financing
statements suitable for filing in the official records of the appropriate state
government and/or any other location required by Bank, granting to Bank a first
priority security interest in such of Borrower's property as is described in
said security agreement. Any exceptions to Bank's first priority Lien are
permitted only as provided in this Agreement. At Bank's request, Borrower will
obtain executed landlord's and mortgagee's waivers, each on Bank's form,
covering all of Borrower's property located on leased or encumbered real
property.

                         SECTION 2. CONDITIONS PRECEDENT

Bank shall not be obligated to disburse all or any portion of the Loans unless
at or prior to the time of each such disbursement, the following conditions have
been fulfilled to Bank's satisfaction:

2.1 COMPLIANCE. Borrower shall have performed and complied with all terms and
conditions required by this Agreement to be performed or complied with, and
shall have executed and

<PAGE>

delivered to Bank the Note and all other Loan Documents.

2.2 SUBORDINATION AGREEMENTS. Bank shall have received such subordination
agreements, in form and substance satisfactory to Bank, as shall be necessary
for Borrower to achieve and maintain compliance with the provisions of Section
5.7 hereof.

2.3 AUTHORIZATION TO OBTAIN CREDIT. Borrower shall have provided Bank with an
executed copy of Bank's form Authorization to Obtain Credit, authorizing the
execution, delivery and performance of this Agreement and the other Loan
Documents. Such resolutions shall also designate the persons who are authorized
to act on Borrower's behalf in connection with this Agreement to do the things
required of Borrower pursuant to this Agreement.

2.4 CONTINUING COMPLIANCE. At the time any disbursement is to be made and
immediately thereafter, there shall not exist any Event of Default (as
hereinafter defined) or any event, condition, or act which with notice or lapse
of time, or both, would constitute an Event of Default.

                    SECTION 3. REPRESENTATIONS AND WARRANTIES

Borrower represents and warrants that:

3.1 BUSINESS ACTIVITY. Borrower's principal business is the analysis and design
of systems for national defense programs.

3.2 AFFILIATES AND SUBSIDIARIES. Borrower's affiliates and subsidiaries (those
entities in which Borrower has either a controlling interest or a twenty-five
percent (25%) or more ownership interest) and their addresses, and the names of
the persons or entities owning five percent (5%) or more of the equity interests
in Borrower, are as provided on a schedule delivered to Bank on or before the
date of this Agreement.

3.3 ORGANIZATION AND QUALIFICATION. Borrower is duly organized and existing
under the laws of the state of its organization, is duly qualified and in good
standing in any jurisdiction where such qualification is required, and has the
power and authority to carry on the business in which it is engaged and/or
proposes to engage.

3.4 POWER AND AUTHORIZATION. Borrower has the power and authority to enter into
this Agreement and to execute and deliver the Note and all other Loan Documents.
This Agreement and all things required by this Agreement and the other Loan
Documents have been duly authorized by all requisite action of Borrower.

3.5 AUTHORITY TO BORROW. The execution, delivery and performance of this
Agreement, the Note and all other Loan Documents are not in contravention of any
of the terms of any indenture, agreement or undertaking to which Borrower is a
party or by which it or any of its property is bound or affected.

3.6 COMPLIANCE WITH LAWS. Borrower is in compliance with all applicable laws,
rules, ordinances or regulations which materially affect the operations or
financial condition of Borrower.

3.7 TITLE. Except for assets which may have been disposed of in the ordinary
course of business, Borrower has good and marketable title to all property
reflected in its financial

<PAGE>

statements delivered to Bank and to all property acquired by Borrower since the
date of said financial statements, free and clear of all Liens, except Liens
specifically referred to in said financial statements.

3.8 FINANCIAL STATEMENTS. Borrower's financial statements, including both a
balance sheet at December 31, 2003, together with supporting schedules, and an
income statement for the twelve (12) months ended December 31,2003 have
heretofore been furnished to Bank, are true and complete, and fairly represent
Borrower's financial condition for the period covered thereby. Since December
31, 2003, there has been no material adverse change in Borrower's financial
condition or operations.

3.9 LITIGATION. There is no litigation or proceeding pending or threatened
against Borrower or any of its property which is reasonably likely to affect the
financial condition, property or business of Borrower in a materially adverse
manner or result in liability in excess of Borrower's insurance coverage.

3.10 ERISA. Borrower's defined benefit pension plans (as defined in the Employee
Retirement Income Security Act of 1974, as amended ("ERISA">>, meet, as of the
date hereof, the minimum funding standards of Section 302 of ERISA, and no
Reportable Event or Prohibited Transaction as defined in ERISA has occurred with
respect to any such plan.

3.11 REGULATION U. No action has been taken or is currently planned by Borrower,
-or any agent acting on its behalf, which would cause this Agreement or the Note
to violate Regulation U or any other regulation of the Board of Governors of the
Federal Reserve System, or to violate the Securities and Exchange Act of 1934,
in each case as in effect now or as the same may hereafter be in effect.
Borrower is not engaged in the business of extending credit for the purpose of
purchasing or carrying margin stock as one of its important activities and,
except as may be expressly agreed to and documented between Borrower and Bank,
none of the proceeds of the Loan will be used directly or indirectly for such
purpose.

3.12 NO EVENT OF DEFAULT. Borrower is not now in default in the payment of any
of its material obligations, and there exists no Event of Default, and no
condition, event or act which with notice or lapse of time, or both, would
constitute an Event of Default.

3.13 CONTINUING REPRESENTATIONS AND WARRANTIES. The foregoing representations
and warranties shall be considered to have been made again at and as of the date
of each and every Loan disbursement and shall be true and correct as of each
such date.

                        SECTION 4. AFFIRMATIVE COVENANTS

Until all sums payable pursuant to this Agreement, the Note and the other Loan
Documents have been paid in full, unless Bank otherwise consents in writing,
Borrower agrees that:

4.1 USE OF PROCEEDS. Borrower will use the proceeds of the Loan only as provided
in Section 1 above.

4.2 PAYMENT OF OBLIGATIONS. Borrower will pay and discharge promptly all taxes,
assessments and other governmental charges and claims levied or imposed upon it
or its property, or any part thereof; provided, however, that Borrower shall
have the right in good faith to contest any such taxes, assessments, charges or
claims and, pending the outcome of such contest, to delay or refuse payment
thereof provided that adequately funded reserves are

<PAGE>

established by it to pay and discharge any such taxes, assessments, charges and
claims.

4.3 MAINTENANCE OF EXISTENCE. Borrower will maintain and preserve its existence,
its assets, and all rights, franchises, licenses and other authority necessary
for the conduct of its business, and will maintain and preserve its property,
equipment and facilities in good order, condition and repair. Bank may, at
reasonable times, visit and inspect any of Borrower's properties.

4.4 RECORDS. Borrower will keep and maintain full and accurate accounts and
records of its operations in accordance with GAAP and will permit Bank, at
Borrower's expense, to have access thereto, to make examination and photocopies
thereof, and to make audits of Borrower's accounts and records and Bank's
collateral during regular business hours.

4.5 INFORMATION FURNISHED. BORROWER WILL FURNISH TO BANK:

      (a) Within sixty (60) days after the close of each fiscal quarter, except
      for the final quarter of each fiscal year, its unaudited balance sheet as
      of the close of such fiscal quarter, its unaudited income and expense
      statement with year-to-date totals and supportive schedules, and its
      statement of retained earnings for that fiscal quarter, all prepared in
      accordance with GAAP.

      (b) Within one hundred twenty (120) days after the close of each fiscal
      year, a copy of its statement of financial condition including at least
      its balance sheet as of the close of such fiscal year and its income and
      expense statement, and its retained earnings statement for such fiscal
      year, examined and prepared on an audited basis by independent certified
      public accountants selected by Borrower and reasonably satisfactory to
      Bank, in accordance with GAAP along with any management letter, if
      provided, by such accountants.

      (c) Prompt written notice to Bank of any Event of Default or breach under
      any of the terms or provisions of this Agreement or any other Loan
      Document, any litigation which would have a material adverse effect on
      Borrower's financial condition, and any other matter which has resulted
      in, or is likely to result in, a material adverse change in Borrower's
      financial condition or operations.

      (d) Prior written notice to Bank of any change in Borrower's officers and
      other senior management, Borrower's name or state of organization, and the
      location of Borrower's assets.

      (e) Within fifteen (15) days after Borrower knows or has reason to know
      that any Reportable Event or Prohibited Transaction (as defined in ERISA)
      has occurred with respect to any defined benefit pension plan of Borrower,
      a statement of an authorized officer of Borrower describing such event or
      condition and the action, if any, which Borrower proposes to take with
      respect thereto.

      (f) Such other financial statements and information as Bank may reasonably
      request from time to time.

4.6 CURRENT RATIO. Borrower will at all times maintain a ratio of current assets
to current liabilities of not less than 1.50: 1.0.

<PAGE>

4.7   TANGIBLE NET WORTH. Borrower will at all times maintain Tangible Net Worth
      of not less than Forty Million Dollars ($40,000,000). "Tangible Net Worth"
      means Borrower's net worth increased by indebtedness subordinated to Bank
      and decreased by patents, licenses, trademarks, trade names, goodwill and
      other similar intangible assets, organizational expenses, security
      deposits, prepaid costs and expenses and monies due from affiliates
      (including officers, shareholders and directors).

4.8   PROFITABILITY. Borrower will achieve net profit after taxes of not less
than Three Million Dollars ($3,000,000) for each fiscal year.

4.9   INSURANCE. Borrower will keep all of its insurable property, whether real,
personal or mixed, insured by companies approved by Bank, against fire and such
other risks, and in such amounts as is customarily obtained by companies
conducting similar business with respect to like properties. Borrower will
furnish to Bank statements of its insurance coverage, will promptly upon Bank's
request furnish other or additional insurance deemed necessary by Bank to the
extent that such insurance may be available, and hereby assigns to Bank, as
security for Borrower's obligations to Bank, the proceeds of any such insurance.
Prior to any Loan disbursement, Bank will be named loss payee under all policies
insuring the collateral. Borrower will maintain adequate worker's compensation
insurance and adequate insurance against liability for damage to persons or
property. All policies shall require at least ten (10) days' written notice to
Bank before alteration or cancellation.

4.10  ADDITIONAL REQUIREMENTS. Upon Bank's demand, Borrower will promptly take
such further action and execute all such additional documents and instruments in
connection with this Agreement and the other Loan Documents as Bank in its
reasonable discretion deems necessary, and promptly supply Bank with such other
information concerning its affairs as Bank may request from time to time.

4.11  LITIGATION AND ATTORNEYS' FEES. Upon Bank's demand, Borrower will promptly
pay to Bank reasonable attorneys' fees, including the reasonable estimate of the
allocated costs and expenses of in-house legal counsel and staff, and all costs
and other expenses paid or incurred by Bank in collecting, modifying or
compromising the Loan or in enforcing or exercising its rights or remedies
created by, connected with or provided for in this Agreement and the other Loan
Documents. If any judicial action, arbitration or other proceeding is commenced,
only the prevailing party shall be entitled to attorneys' fees and court costs.

4.12  BANK EXPENSES. UPON BANK'S REQUEST, Borrower will payor reimburse Bank for
all costs, expenses and fees incurred by Bank in preparing and documenting this
Agreement and the Loan, and all amendments and modifications to any Loan
Documents, including but not limited to all filing and recording fees, costs of
appraisals, insurance and attorneys' fees, including the reasonable estimate of
the allocated costs and expenses of in-house legal counsel and staff.

                          SECTION 5. NEGATIVE COVENANTS

Until all sums payable pursuant to this Agreement, the Note and the other Loan
Documents have been paid in full, unless Bank otherwise consents in writing,
Borrower agrees that:

5.1   LIENS. Borrower will not create, assume or suffer to exist any Lien on any
of its property,

<PAGE>

whether real, personal or mixed, now owned or hereafter acquired, or upon the
income or profits thereof, except (a) Liens in favor of Bank, (b) Liens for
taxes not delinquent and taxes and other items being contested in good faith,
(c) minor encumbrances and easements on real property which do not affect its
market value, (d) existing Liens on Borrower's personal property, and (e) future
purchase money security interests encumbering only the personal property
purchased.

5.2 BORROWINGS. Borrower will not sell, discount or otherwise transfer any
account receivable or any note, draft or other evidence of indebtedness, except
to Bank or except to a financial institution at face value for deposit or
collection purposes only, and without any fees other than the financial
institution's normal fees for such services. Borrower will not borrow any money,
become contingently liable to borrow money, or enter any agreement to directly
or indirectly obtain borrowed money, except (a) pursuant to agreements with Bank
and (b) indebtedness incurred for the purpose of purchasing stock from current
or former employees provided, however, that payments arising from such
obligations do not exceed Borrower's quarterly stock repurchase limitation.

5.3 SALE OF ASSETS, LIQUIDATION OR MERGER. Borrower will not liquidate, dissolve
or enter into any consolidation, merger, partnership or other combination, or
convey, sell or lease all or the greater part of its assets or business, or
purchase or lease all or the greater part of the assets or business of another;
provided, however, that Borrower may acquire, merge or consolidate if Borrower
is the surviving entity and the aggregate value of the assets so transferred
does not exceed ten percent (10%) of Borrower's Tangible Net Worth as of the end
of the month prior to the effective date of such combination, such assets will
not be subject to any Lien following the effective date of such combination, and
no Event of Default shall have occurred and be continuing or shall result
therefrom.

5.4 LOANS, ADVANCES AND GUARANTIES. Borrower will not, except in the ordinary
course of business as currently conducted, make any loans or advances, become a
guarantor or surety, or pledge its credit or properties, except as allowed by
Borrower's stock option plan or loans extended to current employees not to
exceed Twenty Thousand Dollars ($20,000) per employee.

5.5 INVESTMENTS. Borrower will not purchase the debt or equity of another except
for savings accounts and certificates of deposit of Bank, direct U.S. Government
obligations, and commercial paper issued by corporations with the top ratings of
Moody's or Standard & Poor's, provided that all such permitted investments shall
mature within one year of purchase.

5.6 PAYMENT OF DIVIDENDS. Borrower will not declare or pay any dividends, other
than dividends payable solely in its own common stock, or authorize or make any
other distribution with respect to any of its stock now or hereafter
outstanding.

5.7 SUBORDINATION OF CERTAIN INDEBTEDNESS. Not at any time permit the aggregate
principal amount outstanding under all promissory notes issued by Borrower to
all former employees of Borrower and other persons in full or partial
consideration for Borrower's repurchase of shares of stock in Borrower from such
former employees and other persons to exceed Four Million Dollars ($4,000,000)
unless all such amounts in excess of Four Million Dollars ($4,000,000) are
subordinated to all obligations now or hereafter owed by Borrower to Bank
pursuant to subordination agreements in form and substance satisfactory to Bank.
Bank hereby acknowledges and agrees, however, that each of such subordination
agreements shall permit Borrower to make, and shall permit the payee of the
promissory notes subordinated thereby to receive, regularly scheduled payments
of principal and interest under such promissory note(s)

<PAGE>

so long as Borrower has made each and every payment of principal and interest
due and owing to Bank and is not in default under any of its agreements with
Bank.

5.8 AFFILIATE TRANSACTIONS. Borrower will not transfer any property to any
affiliate, except for value received in the normal course of business and for an
amount, including any management or service fee, as would be conducted and
charged with an unrelated or unaffiliated entity. Borrower will not pay any
management fee or fee for services to any affiliate without Bank's prior written
consent.

                          SECTION 6. EVENTS OF DEFAULT

The occurrence of any of the following events ("Events of Default") shall
terminate any obligation of Bank to make or continue the Loan and shall
automatically, unless otherwise provided under the Note, make all sums of
interest and principal and any other amounts owing under the Loan immediately
due and payable, without notice of default, presentment or demand for payment,
protest or notice of nonpayment or dishonor, or any other notices or demands:

6.1 Borrower shall default in the due and punctual payment of the principal of
or the interest on the Note or on any amounts owing under any of the Loan
Documents.

6.2 Any default shall occur under the Note.

6.3 Borrower shall default in the due performance or observance of any covenant
or condition of the Loan Documents.

6.4 Any guaranty or subordination agreement required hereunder shall be breached
or becomes ineffective, or any Guarantor or subordinating creditor shall die,
disavow or attempt to revoke or terminate such guaranty or subordination
agreement.

6.5 There shall be a change in ownership or control of ten percent (10%) or more
of the equity interests in Borrower or any Guarantor.

                          SECTION 7. GENERAL PROVISIONS

7.1 ADDITIONAL REMEDIES. The rights, powers and remedies given to Bank hereunder
shall be cumulative and not alternative and shall be in addition to all rights,
powers and remedies given to Bank by law against Borrower or any other person or
entity including but not limited to Bank's rights of setoff and banker's lien.

7.2 NONWAIVER. Any forbearance or failure or delay by Bank in exercising any
right, power or remedy hereunder shall not be deemed a waiver thereof and any
single or partial exercise of any right, power or remedy shall not preclude the
further exercise thereof. No waiver shall be effective unless it is in writing
and signed by an officer of Bank.

7.3 INUREMENT. The benefits of this Agreement and the other Loan Documents shall
inure to the successors and assigns of Bank and the permitted successors and
assigns of Borrower, but any attempted assignment by Borrower without Bank's
prior written consent shall be null and void.

7.4 APPLICABLE LAW. This Agreement and the other Loan Documents shall be
governed by

<PAGE>

and construed according to the laws of the State of California.

7.5 SEVERABILITY. Should anyone or more provisions of this Agreement or any
other Loan Document be determined to be illegal or unenforceable, all other
provisions of such document shall nevertheless be effective.

7.6 CONTROLLING DOCUMENT. In the event of any inconsistency between the terms of
this Agreement and any other Loan Document, the terms of the other Loan Document
shall prevail.

7.7 CONSTRUCTION. The section and subsection headings herein are for convenient
reference only and shall not limit or otherwise affect the interpretation of
this Agreement.

7.8 AMENDMENTS. This Agreement may be amended only in writing signed by all
parties hereto.

7.9 COUNTERPARTS. Borrower and Bank may execute one or more counterparts to this
Agreement, each of which shall be deemed an original, but all such counterparts
when taken together, shall constitute one and the same agreement.

7.10 NOTICES. Any notices or other communications provided for or allowed
hereunder shall be effective only when given by one of the following methods and
addressed to the parties at their respective addresses and shall be considered
to have been validly given (a) upon delivery, if delivered personally, (b) upon
receipt, if mailed, first class postage prepaid, with the United States Postal
Service, (c) on the next business day, if sent by overnight courier service of
recognized standing, or (d) upon telephoned confirmation of receipt, if
telecopied or e-mailed. The addresses to which notices or demands are to be
given may be changed from time to time by notice delivered as provided above.

7.11 INTEGRATION CLAUSE. Except for the other Loan Documents, this Agreement
constitutes the entire agreement between Bank and Borrower regarding the Loan,
and all prior oral or written communications between Borrower and Bank shall be
of no further effect or evidentiary value.

<PAGE>

THIS AGREEMENT is executed on behalf of the parties by their duly authorized
representatives as of the date first above written.

SPARTA, INC.                                      UNION BANK OF CALIFORNIA, N.A.

By:        /s/ Robert C. Sepucha                  By:         /s/ Jim Heim
           ---------------------                              ------------
Name:      Robert C. Sepucha                      Name:       Jim Heim

Title:     President                              Title:      Vice President

By:        /s/ David E. Schreiman                 Address:    18300 Von Karman
           ----------------------
Name:      David E. Schreiman                                 Suite 310

Title:     Vice President/CFO                                 Irvine, CA 92612

Address:   1911 N. Fort Myer Dr.                  Attention:  Jim Heim
           Suite 1100                             Telecopier: (949) 553-7122
           Arlington, VA 22209                    Telephone:  (949) 553-6851

Attention: David Schreiman, CFO
Telecopier: (703) 558-0036
Telephone: (703) 558-0046

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