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Condensed Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Contract revenue	$ 251	$ 530	$ 646	$ 771
Operating expenses:
Research and development	1,282	1,890	2,423	4,221
General and administrative	509	2,335	1,078	3,116
Total operating expenses	1,791	4,225	3,501	7,337
Operating loss	(1,540)	(3,695)	(2,855)	(6,566)
Interest income (expense), net	(263)		(264)
Gain on sale of royalty interest				2,500
Loss from continuing operations	(1,803)	(3,695)	(3,119)	(4,066)
Income (loss) from discontinued operations	(129)	112	(232)	(12)
Net loss	$ (1,932)	$ (3,583)	$ (3,351)	$ (4,078)
Basic and diluted net loss per share:
Loss from continuing operations	$ (0.05)	$ (0.09)	$ (0.08)	$ (0.10)
Net loss	$ (0.05)	$ (0.09)	$ (0.08)	$ (0.10)
Shares used to compute basic and diluted net loss per share	40,016	39,493	40,062	39,470

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