<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-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.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>
nci:P98
Activin A is a homodimer of inhibin beta A chain. Activin B is a homodimer of inhibin beta B chain. Activin AB is a heterodimer of beta A and beta B.