Isolation, Structure, and Synthesis of a Human Seminal Plasma Peptide with Inhibin-Like Activity

Abstract
A basic peptide isolated from pooled human seminal plasma exhibited inhibin-like activity by suppressing pituitary follicle-stimulating hormone secretion in vitro and in vivo. The peptide has been characterized and sequenced, and a 31-amino-acid synthetic replicate showed full biological activity in vitro.