Structure of two human ovarian inhibins.

The complete amino acid sequences of two forms of human ovarian inhibin have been determined through cloning and nucleotide sequencing of cDNAs encoding their individual subunit precursors. The alpha subunit common to both forms of human inhibin is homologous (84 percent conserved) to its equivalent porcine alpha subunit; the subunits which are different in both inhibins (beta A and beta B) are identical to their porcine equivalents in all but one of 232 sequence positions.