Tags: Protein.
The gonadotropin-releasing hormones (GnRH) (gonadoliberin) are a family of peptides that play a pivotal role in reproduction. The main function of GnRH is to act on the pituitary to stimulate the synthesis and secretion of luteinizing and follicle-stimulating hormones but GnRH also acts on the brain retina sympathetic nervous system gonads and placenta in certain species. There seems to be at least three forms of GnRH. The second form is expressed in midbrain and seems to be widespread.