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The two principal gonadotropins in vertebrates are luteinizing hormone (LH) and follicle-stimulating hormone (FSH), although primates produce a third gonadotropin called chorionic gonadotropin (CG). LH and FSH are heterodimers consisting of two peptide chains, an alpha chain and a beta chain.onadotropins are released under the control of gonadotropin-releasing hormone (GnRH) from the arcuate nucleus and preoptic area of the hypothalamus. The gonads â testes and ovaries â are the primary target organs for LH and FSH.
The discharge of the gonadotropins, FSH and LH, induces the production of estradiol and progesterone from the ovary which, in turn, through a feedback mechanism, influence the pattern of release of GnRH from the hypothalamus.