Activin is a peptide that enhances FSH synthesis and secretion and participates in the regulation of the menstrual cycle. It does the opposite as inhibin. Many other functions have been found to be exerted by activin, including their roles in cell proliferation, differentiation, apoptosis, metabolism, homeostasis, immune response, wound repair, and endocrine function Like inhibin (and AMH) activin belongs to TGF-β superfamily. Structure Activin contains two beta subunit that are identica… (More on Activin)