Activin

**Semantic type:** Amino Acid, Peptide, or Protein|Hormone

**Definition:** Disulfide-linked homo- and heterodimeric growth factors (Activin A, Activin B, Activin AB) of the TGF Family with effects on a range of cell types in addition to promoting FSH release in gonadal sites, depending on subunit composition. Composed of Beta-A and Beta-B subunits.