<unk>  <unk> , also spelled<unk> , is a steroid, a weak<unk> n, and a minor female sex hormone. It is one of three major endogenous<unk> ns, the others being estradiol and estriol.<unk> , as well as the other<unk> ns, are synthesized from cholesterol and secreted mainly from the gonads, though they can also be formed from adrenal androgens in adipose tissue. Relative to estradiol, both<unk>  and estriol have far weaker activity as<unk> ns.<unk>  can be converted into estradiol, and serves mainly as a precursor or metabolic intermediate of estradiol. It is both a precursor and metabolite of estradiol. In addition to its role as a natural hormone,<unk>  has been used as a medication, for instance in menopausal hormone therapy; for information on<unk>  as a medication, see the<unk>  (medication) article.
Estrone
Methyltestosterone
Allyltestosterone
Androgen
Estradiol 
Estradiol
Dihydrotestosterone
2-Hydroxyestradiol