X0202 4 2007-04-03 1 0001097136 SENORX INC SENO 0001041602 MAYFIELD IX 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 1 0 0001041586 MAYFIELD IX MANAGEMENT LLC 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001058335 MAYFIELD ASSOCIATES FUND IV L P 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001008446 UNGER WILLIAM D 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001197110 AUKEN WENDELL G VAN III 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001008453 FONG KEVIN A 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001197106 MYERS FRANK G JR 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001008455 HEIDRICH A GRANT III 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses 0001008459 DALAL YOGEN K 2800 SAND HILL ROAD SUITE 250 MENLO PARK CA 94025 0 0 0 1 See Explanation of Responses Common Stock 2007-04-03 4 C 0 851239 0 A 851239 D Common Stock 2007-04-03 4 C 0 44800 0 A 44800 I by MFAIV Series A Preferred Stock 0 2007-04-03 4 C 0 950000 0 D Common Stock 271428 0 D Series B Preferred Stock 0 2007-04-03 4 C 0 965920 0 D Common Stock 275977 0 D Series C Preferred Stock 0 2007-04-03 4 C 0 1063421 0 D Common Stock 303834 0 D Series A Preferred Stock 0 2007-04-03 4 C 0 50000 0 D Common Stock 14285 0 I by MF AIV Series B Preferred Stock 0 2007-04-03 4 C 0 50837 0 D Common Stock 14524 0 I by MF AIV Series C Preferred Stock 0 2007-04-03 4 C 0 55969 0 D Common Stock 15991 0 I by MF AIV The individual Reporting Persons are Managing Directors of Mayfield IX Management, LLC, which is the sole General Partner of each of Mayfield IX (MF IX) and Mayfield Associates Fund IV (MF AIV). The individual Reporting Persons may be deemed to have shared voting and dispositive power over the shares which are or may be deemed to be beneficially owned by MF IX and MF AIV, but disclaim such beneficial ownership, except to the extent of their pecuniary interest therein. The filing of this statement shall not be deemed an admission that, for the purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the Reporting Persons are the beneficial owners of equity securities covered by this statement. Each of the Reporting Persons included in this filing hereby designates Mayfield IX as its designated filer of Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder. All outstanding shares of the Issuer's Preferred Stock were automatically converted into Common Stock upon the closing of the Issuer's initial public offering for no additional consideration. James T. Beck, Attorney-In-Fact for each Reporting Person 2007-04-03