EXHIBIT 10.14

                       SELLER NOTE MODIFICATION AGREEMENT

BETWEEN:

MAKER:   Accent Optical Technologies, Inc. (formerly Accent Semiconductor
         Technologies, Inc.)

And

PAYEE:   Bio-Rad Laboratories, Inc.

And

BANK:    Comerica Bank-California

SELLER NOTE:

That certain Seller Note of Maker in favor of Payee in the original principal
amount of $8,000,000 dated July 31, 2000.

                                    RECITALS

         a.       Payee is the holder of the Seller Note.

         b.       Bank is providing up to $7,500,000 in credit facilities to
                  Payee pursuant to a Loan and Security Agreement dated December
                  18, 2002 between Maker, AOTI Operating Company, Inc. and Bank
                  ("Comerica Debt").

         c.       A portion of the Comerica Debt will be used to pay off the
                  debt of Payee to Fleet National Bank, which debt was
                  "Designated Senior Debt" as defined under the terms of the
                  Seller Note.

         d.       The payment obligations and security interests (if any) under
                  the Seller Note are subordinated to Designated Senior Debt and
                  Designated Senior Debt enjoys certain other protections for
                  payment under the terms of the Seller Note.

         e.       Because the Comerica Debt is less than $25,000,000, it cannot
                  be designated as Designated Senior Debt under the current
                  provisions of the Seller Note.

         f.       The parties hereto desire to amend the Seller Note to allow
                  for the designation of the Comerica Debt as Senior Debt and
                  Designated Senior Debt as those terms are defined in the
                  Seller Note.

         g.       The Bank would be unwilling to provide the Comerica Debt
                  without this amendment, and Payee acknowledges that the
                  Comerica Debt is beneficial to Maker and thus indirectly
                  benefits Payee.

                                    AGREEMENT

Maker, Payee and Bank agree as follows:

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         1.       The Comerica Debt (specifically the "Obligations", as that
                  term is defined in the Loan and Security Agreement referred to
                  above) is hereby designated as Senior Debt and Designated
                  Senior Debt under the Seller Note.

         2.       Maker and Payee will not further amend, modify or alter the
                  terms of the Seller Note without the consent of Bank, which
                  consent will not be unreasonably withheld as to matters not
                  affecting the subordination of the Seller Note to the Comerica
                  Debt.

         3.       Except as specifically addressed in this Seller Note
                  Modification Agreement, all other terms and conditions of the
                  Seller Note remain in full force and effect.

         4.       This Seller Note Modification Agreement may be executed in two
                  or more counterparts, each of which shall be deemed an
                  original but all of which together shall constitute one and
                  the same instrument.

         5.       Each of the parties hereto agrees to execute all such further
                  instruments and documents and to take all such further action
                  as the other parties may reasonably require in order to
                  effectuate the terms and purposes of this agreement.

         Effective as of the 18th day of December, 2002.

MAKER:                               PAYEE:
Accent Optical Technologies, Inc.    Bio-Rad Laboratories, Inc.

By:   /s/                             By: /s/
    ------------------------------        -------------------------------
Its: President                        Its: Vice President and General Counsel

BANK:
Comerica Bank-California

By:   /s/
    ------------------------------
Its: Vice President

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