Inhibin B (INHB)

The activin and inhibin protein complexes are both dimeric in structure, and, in each complex, the two monomers are linked to one another by a single disulfide bond.In addition, both complexes are derived from the same family of related genes and proteins but differ in their subunit composition.The alpha and beta subunits share approximately 25% sequence similarity, whereas the similarity between beta subunits is approximately 65%. Inhibin is a peptide that is an inhibitor of FSH synthesis and secretion, and participates in the regulation of the menstrual cycle.Inhibin contains an alpha and beta subunit linked by disulfide bonds. Two forms of inhibin differ in their beta subunits (A or B), while their alpha subunits are identical.Inhibin belongs to the transforming growth factor-β (TGF-β) superfamily.