Joint Filing Agreement
Exhibit A
The undersigned hereby agree that the statement on Schedule 13G with respect to the Common
Stock, $0.001 par value of Onxy Pharmaceuticals, Inc., dated as of February 14, 2005, is, and any
amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall
be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule
13d-1(k) under the Securities Exchange Act of 1934.
Date: February 14, 2005
| MAVERICK CAPITAL, LTD. | ||||||||
| By: | Maverick Capital Management, LLC | |||||||
| Its General Partner | ||||||||
| By: | Xxx X. Xxxxxxx III, Manager | |||||||
| By: | /s/ Xxxx X. XxXxxxxxxx | |||||||
| Xxxx X. XxXxxxxxxx | ||||||||
| Under Power of Attorney dated | ||||||||
| February 13, 2003 | ||||||||
| MAVERICK CAPITAL MANAGEMENT, LLC | ||||||||
| By: | Xxx X. Xxxxxxx III, Manager | |||||||
| By: | /s/ Xxxx X. XxXxxxxxxx | |||||||
| Xxxx X. XxXxxxxxxx | ||||||||
| Under Power of Attorney dated | ||||||||
| February 13, 0000 | ||||||||
| XXX X. XXXXXXX III | ||||||||
| By: | /s/ Xxxx X. XxXxxxxxxx | |||||||
| Xxxx X. XxXxxxxxxx | ||||||||
| Under Power of Attorney dated | ||||||||
| February 13, 2003 | ||||||||
