Accrued Expenses

3 Months Ended

Mar. 31, 2012

Accrued Expenses

9.             Accrued Expenses

Accrued expenses consist of the following:

	March 31,		December 31,
	2012		2011
Payroll and benefits	$	1,783,448	$	2,366,412
Professional fees		483,488		793,430
Research grants		1,019,284		989,556
Other		1,011,167		1,172,196
Total	$	4,297,387	$	5,321,594