NCIt definition : Gonadal glycoprotein hormone, Inhibin A, consists of an alpha subunit covalently linked
to a beta-A subunit and strongly inhibits pituitary FSH secretion. Serum concentrations
transit during the menstrual cycle. Dimers of the beta subunit (a TGF-beta superfamily
member), termed activin, are potent stimulators of FSH secretion. (from OMIM 147380
and NCI);