| held for the benefit of Dr. Scott’s children, of which Dr. Scott’s sister is trustee, and options to purchase 230,000 shares of Common Stock that are subject to outstanding options, 144,164 of which are exercisable within 60 days of May 11, 2012. (b) Dr. Scott has sole power to vote or to direct the vote and to dispose or to direct the disposition of 1,490,881 shares of Common Stock. (c) On March 12, 2012, Dr. Scott sold 15,000 shares of Common Stock at an average price of $30.9787 per share. On March 13, 2012, Dr. Scott sold 15,000 shares of Common Stock at an average price of $31.1176 per share. On April 10, 2012, Dr. Scott sold 10,000 shares of Common Stock at an average price of $28.8081 per share. On April 11, 2012, Dr. Scott sold 10,000 shares of Common Stock at an average price of $28.379 per share. On May 10, 2012, Dr. Scott sold 15,000 shares of Common Stock at an average price of $29.9321 per share. On May 11, 2012, Dr. Scott sold 15,000 shares of Common Stock at an average price of $30.5162 per share. These sales were made pursuant to a sales plan in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, adopted by Dr. Scott on November 11, 2011, that provides for the sale of up to 436,000 shares of the Company’s Common Stock. Subsequent to May 11, 2011, Dr. Scott vested with respect to options to purchase an additional 6,666 shares of Common Stock. (d) Not applicable (e) Dr. Scott ceased to be the beneficial owner of more than 5% of the Common Stock of the Company on May 11, 2012. |
| Dr. Scott ceased to be an employee of the Company on August 8, 2012. As of that date, options to purchase 145,832 shares of Common Stock with a weighted average exercise price of $19.54 per share were vested and remain so for three months following the date Dr. Scott’s employment terminated, if not exercised before then. |