JOINT FILING AGREEMENT ----------------------
                                   EXHIBIT 1
                             JOINT FILING AGREEMENT
                             ----------------------
          Pursuant to Rule 13d-1(k)(1)(iii), we the undersigned agree that the
Schedule 13G, to which this Joint Filing Agreement is attached as Exhibit 1, is
filed on behalf of each of us.
Date: February 13, 2001
                               ▇▇▇▇▇▇▇▇ VII
                               A California Limited Partnership
                               By:  ▇▇▇▇▇▇▇▇ VII Management Partners,
                                    a California Limited Partnership,
                                    Its General Partner
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                   ▇▇▇▇▇ ▇. ▇▇▇▇, Authorized Signatory
                               ▇▇▇▇▇▇▇▇ VII MANAGEMENT PARTNERS
                               A California Limited Partnership
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                                  -------------------------------------
                                   ▇▇▇▇▇ ▇. ▇▇▇▇, Authorized Signatory
                               ▇▇▇▇▇▇▇▇ ASSOCIATES FUND II
                               A California Limited Partnership
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                   ▇▇▇▇▇ ▇. ▇▇▇▇, Authorized Signatory
                               ▇▇▇▇▇ ▇. ▇▇▇▇▇
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                               ▇. ▇▇▇▇▇▇ ▇▇▇▇▇, JR.
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                              Page 17 of 34 pages.
                               ▇▇▇▇▇ ▇. ▇▇▇▇
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                               ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                               ▇▇▇▇▇▇▇ ▇. ▇▇▇ ▇▇▇▇▇
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                               ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                   ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                               A. ▇▇▇▇▇ ▇▇▇▇▇▇▇▇, III
                               By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact
                              Page 18 of 34 pages.