EXHIBIT C Existing Options and Warrants - - ------------------------------------ ---------------------- ------------ ------------------------ ------------------ Shares Total Underlying Exercise Exercise Holder Option/Warrant Price Expiration Price as of 6/30/98 Kardatzke Management, Inc. ("KMI") 100,000(1) (2) December 31, 2000 $270,000 KMI 300,000(3) $2.15 March 5, 2000 645,000 ------- 915,000 Institutional Venture Partners VI Limited Partnership ("IVPP") 20,143(1) (2) December 31, 2000 54,386.10 IVPP 60,429(3) $2.15 March 5, 2000 129,922.35 IVPP 139,906(4) $2.15 December 11, 2002 300,797.90 ---------- 485,106.35 IVP Founders Fund I ("IVP-FF") 857(1) (2) December 31, 2000 2,313.90 IVP-FF 2,571(3) $2.15 March 5, 2000 5,527.65 IVP-FF 5,953(4) $2.15 December 11, 2002 12,798.95 --------- 20,640.50 Institutional Venture Management VI ("IVM") 429(1) (2) December 31, 2000 1,158.30 IVM 1,286(3) $2.15 March 5, 2000 2,764.90 IVM 2,976(4) $2.15 December 11, 2002 6,398.40 -------- 10,321.60 Frazier Healthcare II, L.P. ("Frazier") 16,071(1) (2) December 31, 2000 43,391.70 Frazier 48,214(3) $2.15 March 5, 2000 103,660.10 Frazier 111,627(4) $2.15 December 11, 2002 239,998.05 ---------- ---------- 387,049.85 Total 910,462 $1,818,118.30 ======= ============= (1) Options issued pursuant to Section 6.6(c) of Convertible Note. (2) $2.70 per share from 6/1/98 - 12/31/98; $3.15 per share from 1/1/99 - 12/31/99; $3.75 per share from 1/1/2000 - 12/31/2000. (3) Options issued pursuant to Section 6.6(d) of Convertible Note. (4) Warrants issued on December 11, 1997 as part of loan financing which was converted on May 29, 1998. 41