the same alpha chain found in TSH (and LH)
a beta chain of 118 amino acids, which gives it its unique properties.
Synthesis and release of FSH is triggered by the arrival from the hypothalamus of gonadotropin-releasing hormone (GnRH). The effect of FSH depends on one's sex. FSH in females
In sexually-mature females, FSH (assisted by LH) acts on the follicle to stimulate it to release estrogens. FSH produced by recombinant DNA technology (Gonal-f®) is available to promote ovulation in women planning to undergo in vitro fertilization (IVF) and other forms of assisted reproductive technology. FSH in males In sexually-mature males, FSH acts on spermatogonia stimulating (with the aid of testosterone) the production of sperm.