Explanation of Responses: ( 1) The reported transactions involved an amendment of an outstanding option, resulting in the deemed cancellation of the "old" option and the grant of a replacement option. ( 2) The option was originally granted on July 28, 2009 and provides for immediate full vesting. ( 3) The option was originally granted on November 12, 2008 and provides for vesting in three equal annual installments commencing on November 12, 2009. ( 4) The option was originally granted on March 17, 2009 and provides for vesting in three installments of 128,125, 128,125 and 256,250 on September 16, 2009, March 16, 2010 and September 16, 2010, respectively. ( 5) The option was originally granted on January 19, 2010 and provides for vesting in two equal installments on July 18, 2010 and January 18, 2011. ( 6) The option was originally granted on July 12, 2010 and provides for full vesting on January 12, 2011.
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