synonym (8R, 9S, 10R, 13S, 14S, 17S)- 17-hydroxy-10, 13-dimethyl-
1, 2, 6, 7, 8, 9, 11, 12, 14, 15, 16, 17- dodecahydrocyclopenta[a]phenanthren-3-one
Mol. mass: 288.42
Testosterone is a steroid hormone from the androgen group and is found in mammals, reptiles , birds  and other vertebrates. Its counterpart in insects is the ecdysteroids . In mammals, testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. It is the principal male gender hormone and an anabolic steroid. Testosterone is evolutionarily conserved through most vertebrates, although fish make a slightly different form called 11-ketotestosterone.
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