JOINT FILING AGREEMENT
EXHIBIT 1
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as
amended, the persons named below agree to the joint filing on behalf of each of them a Statement on
Schedule 13G (including amendments thereto) with regard to the
common stock of Xenogen Corporation and
further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In
evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing
Agreement as of February 14, 2006.
| WS CAPITAL, L.L.C. | ||||
| By: | /s/ Xxxx X. Xxxxxx | |||
| Xxxx X. Xxxxxx, Member | ||||
| WS CAPITAL MANAGEMENT, L.P. | ||||
| By: | WS Capital, L.L.C., its general partner | |||
| By: | /s/ Xxxx X. Xxxxxx | |||
| Xxxx X. Xxxxxx, Member | ||||
| /s/ Xxxx X. Xxxxxx | ||||
| XXXX X. XXXXXX | ||||
| /s/ G. Xxxxx Xxxxx | ||||
| G. XXXXX XXXXX | ||||
| BC ADVISORS, LLC | ||||
| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx, Member | ||||
| SRB MANAGEMENT, L.P. | ||||
| By: | BC Advisors, LLC, its general partner | |||
| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx, Member | ||||
| /s/ Xxxxxx X. Xxxxxx | ||||
| XXXXXX X. XXXXXX | ||||
