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.

                                   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/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Authorized Signatory

                            ▇▇▇▇▇▇▇▇ VII MANAGEMENT PARTNERS
                            A California Limited Partnership

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                 ▇▇▇▇▇ ▇. ▇▇▇▇, Authorized Signatory

                            ▇▇▇▇▇▇▇▇ ASSOCIATES FUND II
                            A California Limited Partnership

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                  ▇▇▇▇▇ ▇. ▇▇▇▇, Authorized Signatory

                            ▇▇▇▇▇ ▇. ▇▇▇▇▇

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                            ▇. ▇▇▇▇▇▇ ▇▇▇▇▇, JR.

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                            ▇▇▇▇▇ ▇. ▇▇▇▇

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                             Page 17 of 34 pages.


                            ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                            ▇▇▇▇▇▇▇ ▇. ▇▇▇ ▇▇▇▇▇, III

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
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                                ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                            ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                 ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                            A. ▇▇▇▇▇ ▇▇▇▇▇▇▇▇, III

                            By:  /s/ ▇▇▇▇▇ ▇. ▇▇▇▇
                               -------------------
                                ▇▇▇▇▇ ▇. ▇▇▇▇, Attorney In Fact

                             Page 18 of 34 pages.