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Activins are members of the TGF-β superfamily and have been linked to prostate cancer. There are four mammalian activin subunits (βA, βB, βC, and βE) that dimerize to form functional proteins. The role of activin-A (βA-βA) has been relatively well characterized and has been shown to generally inhibit growth in the prostate. In contrast, little is known about the biological function of the βC and β...