Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Grant receivable	$ 580,964	$ 10,703
Prepaid expenses and other current assets	132,940	384,806
Total current assets	3,000,110	4,185,861
Property and equipment, net of accumulated depreciation of $112,670 and $107,907	21,261	24,940
Other assets	11,503	17,255
Total assets	3,032,874	4,228,056
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	227,594	185,643
Accrued expenses	801,642	430,996
Total current liabilities	1,029,236	616,639
Commitments	0
Stockholders' equity
Preferred stock, $.001 par value per share, 1,000,000 authorized; no shares issued	0
Common stock, par value $.001 per share, 200,000,000 shares authorized; 79,961,902 issued and outstanding as of June 30, 2011; 73,531,578 issued and outstanding as of December 31, 2010	79,962	73,532
Additional paid-in capital	94,577,567	93,063,201
Accumulated deficit	(92,653,891)	(89,525,316)
Total stockholders' equity	2,003,638	3,611,417
Total liabilities and stockholders' equity	$ 3,032,874	$ 4,228,056