JOINT FILING AGREEMENT
| CUSIP No. 073677 10 6 | SCHEDULE 13D (Amendment No. 4) |
EXHIBIT 1
Each of the undersigned hereby acknowledges and agrees, in compliance with the provisions of Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, that the Amendment No. 4 to Schedule 13D to which this agreement is attached as Exhibit 1, and any amendments thereto, will be filed with the Securities and Exchange Commission jointly on behalf of each of the undersigned.
This agreement may be executed in counterparts.
Dated: June 1, 2005
| XXXXX X. XXXXX |
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| By: | /s/ Xxxx Xxxxxxx | |||
| Name: | Xxxx Xxxxxxx | |||
| Title: | Attorney-in-fact | |||
| PERSEUS CAPITAL, L.L.C. |
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| By: | /s/ Xxxx Xxxxxxx | |||
| Name: | Xxxx Xxxxxxx | |||
| Title: | Chief Financial Officer and Secretary | |||
| PERSEUS 2000 EXPANSION, L.L.C. |
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| By: | /s/ Xxxx Xxxxxxx | |||
| Name: | Xxxx Xxxxxxx | |||
| Title: | Chief Financial Officer and Secretary | |||
