EXHIBIT 24.1

POWER OF ATTORNEY

Know all men by these presents, that each person whose signature appears below,
does hereby constitute and appoint Gary Katz and Michael J. Simon, and each of them severally, his or her true and lawful attorney-in-fact with power of substitution and re-substitution to sign his or her name, place and stead, in and all
capacities, to do any and all things and execute any and all instruments that such attorney may deem necessary and advisable under the Securities Exchange Act of 1934, as amended, and any rules, regulations and requirements of the Securities and
Exchange Commission in connection with the Companys Annual Report Form 10-K for the fiscal year ended December 31, 2006, File Number 001-32435, to be filed pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934, and
to any amendment thereto, as fully for all intents and purposes as he or she could do in person; and hereby ratifies and confirms all that said attorneys-in-fact, or any one of them, shall lawfully do or cause to be done by virtue hereof.



|                                                      |  |                                         |  |                  
|----------------------------------------------------- |  | --------------------------------------- |  | -----------------
|Signature                                             |  | Title                                   |  | Date             
|                                                      |  |                                        
|/S/    DAVID
KRELL David Krell                        |  | President and Chief Executive Officer   |  | February 26, 2007
|                                                      |  |                                        
|/S/    BRUCE
COOPERMAN Bruce Cooperman                |  | Chief Financial Officer                 |  | February 26, 2007
|                                                      |  |                                        
|/S/    AMIT
MUNI Amit Muni                            |  | Principal Accounting Officer            |  | February 26, 2007
|                                                      |  |                                        
|/S/    FRANK J.
JONES Frank J. Jones, Ph.D.           |  | Chairman of the Board of Directors      |  | February 26, 2007
|                                                      |  |                                        
|/S/    JOHN F.
MARSHALL John F. Marshall, Ph.D.       |  | Vice Chairman of the Board of Directors |  | February 26, 2007
|                                                      |  |                                        
|/S/    BARBARA B.
DIAMOND Barbara B. Diamond          |  | Director                                |  | February 26, 2007
|                                                      |  |                                        
|/S/    MARK P.
KRITZMAN Mark P. Kritzman              |  | Director                                |  | February 26, 2007
|                                                      |  |                                        
|/S/    SARAH A.
MILLER Sarah A. Miller                |  | Director                                |  | February 26, 2007
|                                                      |  |                                        
|/S/    CARLETON DAY
PEARL Carleton Day Pearl          |  | Director                                |  | February 26, 2007
|                                                      |  |                                        
|/S/    IVERS W.
RILEY Ivers W. Riley                  |  | Director                                |  | February 26, 2007
|                                                      |  |                                        
|/S/    RICHARD
SCHMALENSEE Richard Schmalensee, Ph.D. |  | Director                                |  | February 27, 2007