Testosterone is a steroid hormone from the androgen group and is found in humans and other vertebrates. Testosterone is secreted primarily by the testicles of males and, to a lesser extent, the ovaries of females. Small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid. In men, testosterone plays a key role in the development of male reproductive tissues (testis and prostate) and secondary sexual characteristics.
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