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Luteinizing hormone (LH) is a glycoprotein gonadotropin secreted by pituitary cells, which can promote the conversion of cholesterol into sex hormones in gonad cells. For women, it works together with follicle-stimulating hormone (FSH) to promote follicular maturation, secretion of estrogen, ovulation, and corpus luteum formation and maintenance, and secretion of progesterone and estrogen. In men, LH prompts the Leydig cells to synthesize and release testosterone.