[url=http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v374/n6520/full/374311a0.html&filetype=PDF]
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Angles on activin's absence
Jim Smith
Nature374, 311 - 312 (23 Mar 1995) News and Views (from the Nature Archive: January 1987 - December 1996)
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