"Explanation of Responses:
( 1) Includes various shares of our common stock issuable upon exercise of options that are vested or exercisable within 60 days in amounts and at exercise prices as follows: 141,667 shares at $0.352, 250,000 shares at $0.132 and 850,000 shares at $0.09. Does not include certain shares of our common stock issuable upon exercise of options that will not vest within 60 days with amounts and exercise prices as follows: 283,332 shares $0.352, 250.000 shares at $0.132 and 750.000 shares at $0.04."