Consolidated Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 4,156,749	$ 7,451,714
Grants receivable	336,560	120,787
Other receivable	4,322	251,864
Prepaid expenses	91,635	187,494
Total current assets	4,589,266	8,011,859
Office furniture and equipment, net	17,100	20,699
Intangible assets, net	1,246,543	1,235,989
Total assets	5,852,909	9,268,547
Current liabilities:
Accounts payable	1,373,974	1,674,175
Accrued compensation	49,302	236,581
Total current liabilities	1,423,276	1,910,756
Shareholders equity
Preferred stock; 5,000,000 shares authorized; none issued or outstanding	0	0
Common stock, $.001 par value; 400,000,000 shares authorized; 218,240,167 shares and 216,192,360 shares issued and outstanding in 2011 and 2010, respectively	218,240	216,192
Additional paid-in capital	123,601,900	122,880,378
Accumulated deficit	(119,390,507)	(115,738,779)
Total shareholders equity	4,429,633	7,357,791
Total liabilities and shareholders’ equity	$ 5,852,909	$ 9,268,547