Human Menopausal Gonadotropins are protein hormones secreted by gonadotrope cells of the pituitary gland of vertebrates. Gonadotropin's sometimes abbreviated Gn. The British spelling's gonadotrophin. Types The two principal gonadotropins are luteinizing hormone (LH) and follicle stimulating hormone (FSH). Both hormones consist of two peptide chains, an alpha chain and a beta chain, linked by Hydrogen bonds and van der Waals forces. LH and FSH share nearly identical alpha chains, while the beta c… (More on Gonadotropins)