Document:

<PAGE>

                          SANTA MONICA BANK

                               [LOGO]

                           PROMISSORY NOTE

<TABLE>
<CAPTION>

   PRINCIPAL     LOAN DATE     MATURITY     LOAN NO     CALL     COLLATERAL     ACCOUNT     OFFICER     INITIALS
-------------------------------------------------------------------------------------------------------------------
<S>             <C>           <C>          <C>          <C>      <C>            <C>         <C>         <C>
$2,000,000.00   03-30-1999    05-02-2000   200311592                                           KB         KB
-------------------------------------------------------------------------------------------------------------------

</TABLE>

  References in the shaded area are for Lender's use only and do not limit the
      applicability of this document to any particular loan or item.

BORROWER:  PHYSIOLOGIC  REPS,                  LENDER:  SANTA MONICA BANK
           A CALIFORNIA CORPORATION                     LOAN SERVICING CENTER
           (TIN: 95-2846224)                            1231 4TH STREET
           932 GRAND CENTRAL AVENUE                     SANTA MONICA, CA 90401
           GLENDALE, CA 91201

===============================================================================

PRINCIPAL AMOUNT: $2,000,000.00                  DATE OF NOTICE: MARCH 30, 1999

                              INITIAL RATE: 8.750%

PROMISE TO PAY. PHYSIOLOGIC REPS, A CALIFORNIA CORPORATION ("BORROWER")
PROMISES TO PAY TO SANTA MONICA BANK ("LENDER"), OR ORDER, IN LAWFUL MONEY OF
THE UNITED STATES OF AMERICA, THE PRINCIPAL AMOUNT OF TWO MILLION & 00/100
DOLLARS ($2,000,000.00) OR SO MUCH AS MAY BE OUTSTANDING, TOGETHER WITH
INTEREST ON THE UNPAID OUTSTANDING PRINCIPAL BALANCE OF EACH ADVANCE.
INTEREST SHALL BE CALCULATED FROM THE DATE OF EACH ADVANCE UNTIL REPAYMENT OF
EACH ADVANCE.

PAYMENT. BORROWER WILL PAY THIS LOAN IN ONE PAYMENT OF ALL OUTSTANDING
PRINCIPAL PLUS ALL ACCRUED UNPAID INTEREST ON MAY 2, 2000. IN ADDITION,
BORROWER WILL PAY REGULAR MONTHLY PAYMENTS OF ACCRUED UNPAID INTEREST
BEGINNING MAY 2, 1999, AND ALL SUBSEQUENT INTEREST PAYMENTS ARE DUE ON THE
SAME DAY OF EACH MONTH AFTER THAT. The annual interest rate for this Note is
computed on a 365/360 basis; that is, by applying the ratio of the annual
interest rate over a year of 360 days, multiplied by the outstanding
principal balance, multiplied by the actual number of days the principal
balance is outstanding. Borrower will pay Lender at Lender's address shown
above or at such other place as Lender may designate in writing. Unless
otherwise agreed or required by applicable law, payments will be applied
first to accrued unpaid interest, then to principal, and any remaining amount
to any unpaid collection costs and late charges.

VARIABLE INTEREST RATE. The interest rate on this Note is subject to change
from time to time based on changes in an independent index which is the Prime
rate as published in the Wall Street Journal. When a range of rates has been
published, the higher of the rates will be used (the "Index"). The index is
not necessarily the lowest rate charged by Lender on its loans. If the Index
becomes unavailable during the term of this loan, Lender may designate a
substitute index after notice to Borrower. Lender will tell Borrower the
current Index rate upon Borrower's request. Borrower understands that Lender
may make loans based on other rates as well. The interest rate change will
not occur more often than each DAY. THE INDEX CURRENTLY IS 7.760%. THE
INTEREST RATE TO BE APPLIED TO THE UNPAID PRINCIPAL BALANCE OF THIS NOTE WILL
BE AT A RATE OF 1.000 PERCENTAGE POINT OVER THE INDEX, RESULTING IN AN
INITIAL RATE OF 8.750%. NOTICE: Under no circumstances will the interest rate
on this Note be more than the maximum rate allowed by applicable law.

PREPAYMENT; MINIMUM INTEREST CHARGE. Borrower agrees that all loan fees and
other prepaid finance charges are earned fully as of the date of the loan and
will not be subject to refund upon early payment (whether voluntary or as a
result of default), except as otherwise required by law. In any event, even
upon full prepayment of this Note, Borrower understands that Lender is
entitled to a minimum interest charge of $50.00. Other than Borrower's
obligation to pay any minimum interest charge, Borrower may pay without
penalty all or a portion of the amount owed earlier than it is due. Early
payments will not, unless agreed to by Lender in writing, relieve Borrower of
Borrower's obligation to continue to make payments of accrued unpaid
interest. Rather, they will reduce the principal balance due.

LATE CHARGE. If a payment is 15 DAYS OR MORE LATE, Borrower will be charged
5.000% OF THE REGULARLY SCHEDULED PAYMENT OR $5.00, WHICHEVER IS GREATER.

DEFAULT. Borrower will be in default if any of the following happens: (a)
Borrower fails to make any payment within five (5) days after receipt of
notice that such payment has not been made by Borrower. (b) Borrower breaks
any promise Borrower has made to Lender, or Borrower fails to comply with or
to perform when due any other term, obligation, covenant, or condition
contained in this Note or any agreement related to this Note, or in any other
agreement or loan Borrower has with Lender. (c) Borrower defaults under any
loan, extension of credit, security agreement, purchase or sales agreement,
or any other agreement, in favor of any other creditor or person that may
materially affect any of Borrower's property or Borrower's ability to repay
this Note or perform Borrower's obligations under this Note or any of the
Related Documents beyond the cure period in the those periods. (d) Any
representation or statement made or furnished to Lender by Borrower or on
Borrower's behalf is false or misleading in any material respect either now
or at the time made or furnished. (e) Borrower becomes insolvent, a receiver
is appointed for any part of Borrower's property, Borrower makes an
assignment for the benefit of creditors, or any proceeding is commenced
either by Borrower or against Borrower under any bankruptcy or insolvency
laws. (f) Any creditor tries to take any of Borrower's property on or in
which Lender has a lien or security interest. This includes a garnishment of
any of Borrower's accounts with Lender. (g) Any guarantor dies or any of the
other events described in this default section occurs with respect to any
guarantor of this Note. (h) A material adverse change occurs in Borrower's
financial condition, or Lender believes the prospect of payment or
performance of the indebtedness is impaired.

LENDER'S RIGHTS. Upon default, Lender may declare the entire unpaid principal
balance on this Note and all accrued unpaid interest immediately due, without
notice, and then Borrower will pay that amount. Upon Borrower's failure to
pay all amounts declared due pursuant to this section, including failure to
pay upon final maturity, Lender, at its option, may also, if permitted under
applicable law, increase the variable interest rate on this Note to 5.000
percentage points over the Index. Lender may hire or pay someone else to help
collect this Note if Borrower does not pay. Borrower also will pay Lender the
reasonable costs of such collection effort. This includes, subject to any
limits under applicable law, Lender's attorneys' fees and Lender's legal
expenses whether or not there is a lawsuit, including attorneys' fees and
legal expenses for bankruptcy proceedings (including efforts to modify or
vacate any automatic stay or injunction), appeals, and any anticipated
post-judgment collection services. Borrower also will pay any court costs, in
addition to all other sums provided by law. THIS NOTE HAS BEEN DELIVERED TO
LENDER AND ACCEPTED BY LENDER IN THE STATE OF CALIFORNIA. IF THERE IS A
LAWSUIT, BORROWER AGREES UPON LENDER'S REQUEST TO SUBMIT TO THE JURISDICTION
OF THE COURTS OF LOS ANGELES COUNTY, THE STATE OF CALIFORNIA. THIS NOTE SHALL
BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
CALIFORNIA.

RIGHT OF SETOFF. Borrower grants to Lender a contractual security interest
in, and hereby assigns, conveys, delivers, pledges, and transfers to Lender
all Borrower's right, title and interest in and to, Borrower's accounts with
Lender (whether checking, savings, or some other account), including without
limitation all accounts held jointly with someone else and all accounts
Borrower may open in the future, excluding however all IRA and Keogh
accounts, and all trust accounts for which the grant of a security interest
would be prohibited by law. Borrower authorizes Lender, to the extent
permitted by applicable law, to charge or setoff all sums owing on this Note
against any and all such accounts.

LINE OF CREDIT. This Note evidences a revolving line of credit. Advances
under this Note may be requested either orally or in writing by Borrower or

===============================================================================
<PAGE>

03-30-1999                      PROMISSORY NOTE                          PAGE 2
LOAN NO 200311592                (CONTINUED)

===============================================================================

as provided in this paragraph. Lender may, but need not, require that all
oral requests be confirmed in writing. All communications, instructions, or
directions by telephone or otherwise to Lender are to be directed to Lender's
office shown above. The following party or parties are authorized as provided
in this paragraph to request advances under the line of credit until Lender
receives from Borrower at Lender's address shown above written notice of
revocation of their authority: ALLEN BONNIFIELD, CHIEF EXECUTIVE
OFFICER/CHIEF FINANCIAL OFFICER; GREGORY BONNIFIELD, PRESIDENT; AND MICHAEL
FEWER, SECRETARY. ANY ONE OF SUCH OFFICERS MAY REQUEST ADVANCES. Borrower
agrees to be liable for all sums either: (a) advanced in accordance with the
instructions of an authorized person or (b) credited to any of Borrower's
accounts with Lender. The unpaid principal balance owing on this Note at any
time may be evidenced by endorsements on this Note or by Lender's internal
records, including daily computer print-outs. Lender will have no obligation
to advance funds under this Note if: (a) Borrower or any guarantor is in
default under the terms of this Note or any agreement that Borrower or any
guarantor has with Lender, including any agreement made in connection with
the signing of this Note; (b) Borrower or any guarantor ceases doing business
or is insolvent; (c) any guarantor seeks, claims or otherwise attempts to
limit, modify or revoke such guarantor's guarantee of this Note or any other
loan with Lender; or (d) Borrower has applied funds provided pursuant to this
Note for purposes other than those authorized by Lender.

GENERAL PROVISIONS. Lender may delay or forgo enforcing any of its rights or
remedies under this Note without losing them. Borrower and any other person
who signs, guarantees or endorses this Note, to the extent allowed by law,
waive any applicable statute of limitations, presentment, demand for payment,
protest and notice of dishonor. Upon any change in the terms of this Note,
and unless otherwise expressly stated in writing, no party who signs this
Note, whether as maker, guarantor, accommodation maker or endorser, shall be
released from liability. All such parties agree that Lender may renew or
extend (repeatedly and for any length of time) this loan, or release any
party or guarantor or collateral; or impair, fail to realize upon or perfect
Lender's security interest in the collateral; and take any other action
deemed necessary by Lender without the consent of or notice to anyone. All
such parties also agree that Lender may modify this loan without the consent
of or notice to anyone other than the party with whom the modification is
made.

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS
OF THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. BORROWER
AGREES TO THE TERMS OF THE NOTE AND ACKNOWLEDGES RECEIPT OF A COMPLETED COPY
OF THE NOTE.

BORROWER:

PHYSIOLOGIC REPS, A CALIFORNIA CORPORATION

BY: /s/ Gregory Bonnifield
   ---------------------------------------
   GREGORY BONNIFIELD, PRESIDENT

===============================================================================<PAGE>
                                    [LOGO]

                                PROMISSORY NOTE

<TABLE>
<CAPTION>

   PRINCIPAL     LOAN DATE     MATURITY     LOAN NO     CALL     COLLATERAL     ACCOUNT     OFFICER     INITIALS
-------------------------------------------------------------------------------------------------------------------
<S>             <C>           <C>          <C>          <C>      <C>            <C>         <C>       <C>
$2,000,000.00   03-30-1999    04-02-2004   200311600                                           KB     /s/[ILLEGIBLE]
-------------------------------------------------------------------------------------------------------------------

</TABLE>

  References in the shaded area are for Lender's use only and do not limit the
      applicability of this document to any particular loan or item.

BORROWER:  PHYSIOLOGIC REPS,                   LENDER:  SANTA MONICA BANK
           A CALIFORNIA CORPORATION                     LOAN SERVICING CENTER
           (TIN: 95-2846224)                            1231 4TH STREET
           932 GRAND CENTRAL AVENUE                     SANTA MONICA, CA 90401
           GLENDALE, CA 91201

===============================================================================

PRINCIPAL AMOUNT: $2,000,000.00                     DATE OF NOTE: MARCH 30,1999
                               INITIAL RATE: 9.000%

PROMISE TO PAY. PHYSIOLOGIC REPS, A CALIFORNIA CORPORATION ("BORROWER")
PROMISES TO PAY TO SANTA MONICA BANK ("LENDER"), OR ORDER, IN LAWFUL MONEY OF
THE UNITED STATES OF AMERICA, THE PRINCIPAL AMOUNT OF TWO MILLION & 00/100
DOLLARS ($2,000,000.00), TOGETHER WITH INTEREST ON THE UNPAID PRINCIPAL
BALANCE FROM MARCH 30, 1999, UNTIL PAID IN FULL.

PAYMENT. SUBJECT TO ANY PAYMENT CHANGES RESULTING FROM CHANGES IN THE INDEX,
BORROWER WILL PAY THIS LOAN IN 59 PRINCIPAL PAYMENTS OF $33,333.33 EACH
AND ONE FINAL PRINCIPAL AND INTEREST PAYMENT OF $33,591.86. BORROWER'S FIRST
PRINCIPAL PAYMENT IS DUE MAY 2, 1999, AND ALL SUBSEQUENT PRINCIPAL PAYMENTS
ARE DUE ON THE SAME DAY OF EACH MONTH AFTER THAT. IN ADDITION, BORROWER WILL
PAY REGULAR MONTHLY PAYMENTS OF ALL ACCRUED UNPAID INTEREST DUE AS OF EACH
PAYMENT DATE. BORROWER'S FIRST INTEREST PAYMENT IS DUE MAY 2, 1999, AND ALL
SUBSEQUENT INTEREST PAYMENTS ARE DUE ON THE SAME DAY OF EACH MONTH AFTER
THAT. BORROWER'S FINAL PAYMENT DUE APRIL 2, 2004, WILL BE FOR ALL PRINCIPAL
AND ACCRUED INTEREST NOT YET PAID. The annual interest rate for this Note is
computed on a 365/360 basis; that is, by applying the ratio of the annual
interest rate over a year of 360 days, multiplied by the outstanding
principal balance, multiplied by the actual number of days the principal
balance is outstanding. Borrower will pay Lender at Lender's address shown
above or at such other place as Lender may designate in writing. Unless
otherwise agreed or required by applicable law, payments will be applied
first to accrued unpaid interest, then to principal, and any remaining amount
to any unpaid collection costs and late charges.

VARIABLE INTEREST RATE. The interest rate on this Note is subject to change
from time to time based on changes in an independent index which is the Prime
rate as published in the Wall Street Journal. When a range of rates has been
published, the higher of the rates will be used (the "Index"). The Index is not
necessarily the lowest rate charged by Lender on its loans. If the Index
becomes unavailable during the term of this loan, Lender may designate a
substitute index after notice to Borrower. Lender will tell Borrower the
current Index rate upon Borrower's request. Borrower understands that Lender
may make loans based on other rates as well. The interest rate change will not
occur more often than each DAY. THE INDEX CURRENTLY IS 7.750%. THE INTEREST
RATE TO BE APPLIED TO THE UNPAID PRINCIPAL BALANCE OF THIS NOTE WILL BE AT A
RATE OF 1.250 PERCENTAGE POINTS OVER THE INDEX, RESULTING IN AN INITIAL RATE OF
9.000%. NOTICE: Under no circumstances will the interest rate on this Note be
more than the maximum rate allowed by applicable law.
<PAGE>

PREPAYMENT; MINIMUM INTEREST CHARGE. In any event, even upon full prepayment
of this Note, Borrower understands that Lender is entitled TO A MINIMUM
INTEREST CHARGE OF $50.00. Other than Borrower's obligation to pay any
minimum interest charge, Borrower may pay without penalty all or a portion of
THE amount owed earlier than it is due. Early payments will not, unless
agreed to by Lender in writing, relieve Borrower of Borrower's obligation to
continue to make payments under the payment schedule. Rather, they will
reduce the principal balance due and may result in Borrower making fewer
payments.

LATE CHARGE. If a payment is 15 DAYS OR MORE LATE, BORROWER WILL BE CHARGED
5.000% OF THE REGULARLY SCHEDULED PAYMENT OR $5.00, WHICHEVER IS GREATER.

DEFAULT. Borrower will be in default if any of THE following happens: (a)
Borrower fails to make any payment within five (5) days after receipt of
notice that such payment has not been made by Borrower. (b) Borrower breaks
any promise Borrower has made to Lender, or Borrower fails to comply with or
to perform when due any other term, obligation, covenant, or condition
contained in this Note or any agreement related to this Note, or in any other
agreement or loan Borrower has with Lender. (c) Borrower defaults under any
loan, extension of credit, security agreement, purchase or sales agreement,
or any other agreement, in favor of any other creditor or person that may
materially effect any of Borrower's property or Borrower's ability to repay
this Note or perform Borrower's obligations under this Note or any of the
Related Documents beyond the cure period in those periods. (d) Any
representation or statement made or furnished to Lender by Borrower or on
Borrower's behalf is false or misleading in any material respect either now
or at the time made or furnished. (e) Borrower becomes insolvent, a receiver
is appointed for any part of Borrower's property, Borrower makes an
assignment for the benefit of creditors, or any proceeding is commenced either
by Borrower or against Borrower under any bankruptcy or insolvency laws. (f)
Any creditor tries to take any of Borrower's property on or in which Lender
has a lien or security interest. This includes a garnishment of any of
Borrower's accounts with Lender, (g) Any guarantor dies or any of the other
events described in this default section occurs with respect to any guarantor
of this Note. (h) A material adverse change occurs in Borrower's financial
condition, or Lender believes the prospect of payment or performance of the
indebtedness is impaired.

LENDER'S RIGHTS. Upon default, Lender may declare the entire unpaid principal
balance on this Note and all accrued unpaid interest immediately due, without
notice, and then Borrower will pay that amount. Upon Borrower's failure to
pay all amounts declared due pursuant to this section, including failure to
pay upon final maturity, Lender, at its option, may also, if permitted under
applicable law, increase the variable interest rate on this Note to 5.00
percentage points over the index. Lender may hire or pay someone else to help
collect this Note if Borrower does not pay. Borrower also will pay Lender the
reasonable costs of such collection effort. This includeS, subject tO any
limits under applicable law, Lender's attorneys' fees and Lender's legal
expenses whether or not there is a lawsuit, including attorneys' fees and
legal expenses for bankruptcy proceedings (including efforts to modify or
vacate any automatic stay or injunction), appeals, and any anticipated
post-judgment collection services. Borrower also will pay any court costs, in
addition to all other sums provided by law. THIS NOTE HAS BEEN DELIVERED TO
LENDER AND ACCEPTED BY LENDER IN THE STATE OF CALIFORNIA. IF THERE IS A
LAWSUIT, BORROWER AGREES UPON LENDER'S REQUEST TO SUBMIT TO THE JURISDICTION
OF THE COURTS OF LOS ANGELES COUNTY, THE STATE OF CALIFORNIA. THIS NOTE SHALL
BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
CALIFORNIA.

RIGHT OF SETOFF. Borrower grants to Lender a contractual security interest
in, and hereby assigns, conveys, delivers, pledges, and transfers to Lender
all Borrower's right, title and interest in and to, Borrower's accounts with
Lender (whether checking, savings, or some other account), including without
limitation all accounts held jointly with someone else and all accounts
Borrower may open in the future, excluding however all IRA and Keogh
accounts, and all trust accounts for which the grant of a security interest
would be prohibited by law. Borrower authorizes Lender, to the extent
permitted by applicable law, to charge or offset all sums owing on this Note
against any and all such accounts.

<PAGE>

03-30-1999                      PROMISSORY NOTE                          PAGE 2
LOAN NO 200311600                 (CONTINUED)
===============================================================================

GENERAL PROVISIONS. Lender may delay or forgo enforcing any of its rights or
remedies under this Note without losing them. Borrower and any other person
who signs, guarantees or endorses this Note, to the extent allowed by law,
waive any applicable statute of limitations, presentment, demand for payment,
protest and notice of dishonor. Upon any change in the terms of this Note, and
unless otherwise expressly stated in writing, no party who signs this Note,
whether as maker, guarantor, accommodation maker or endorser, shall be
released from liability. All such parties agree that Lender may renew or
extend (repeatedly and for any length of time) this loan, or release any
party or guarantor or collateral; or impair, fail to realize upon or perfect
Lender's security interest in the collateral; and take any other action
deemed necessary by Lender without the consent of or notice to anyone. All
such parties also agree that Lender may modify this loan without the consent
of or notice to anyone other than the party with whom the modification is
made.

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS
OF THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. BORROWER AGREES
TO THE TERMS OF THE NOTE AND ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THE
NOTE.

BORROWER:

PHYSIOLOGIC REPS, A CALIFORNIA CORPORATION

BY: /s/ GREGORY BONNIFIELD
    -----------------------------
    GREGORY BONNIFIELD, PRESIDENT

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