EX-99.A 2 w30537exv99wa.htm EX-A exv99wa
 

                     
CUSIP No.
  
45104P104 
   Page  
12 
   of   
12 
Exhibit A
AGREEMENT
Pursuant to Rule 13d-1(k)(1) promulgated pursuant to the Securities Exchange Act of 1934, as amended, the undersigned agree that the attached Schedule 13D is being filed on behalf of each of the undersigned.
February 16, 2007
             
    VENROCK ASSOCIATES    
 
            
 
  By:
Name: 		  /s/ Linda H. Hanauer
 
Linda H. Hanauer 		   
 
  Title:   Authorized Signatory or Member    
 
            
 
            
    VENROCK ASSOCIATES II, L.P.    
 
            
 
  By:
Name: 		  /s/ Linda H. Hanauer
 
Linda H. Hanauer 		   
 
  Title:   Authorized Signatory or Member