endocrine systems...leads to the synthesis of estradiol, although another route, which avoids the formation of testosterone, is possible. Other estrogens are also known; the most familiar ones in man and other mammals, estrone and estriol, are much less active than estradiol, estriol being the weakest. Estrone can be converted to estradiol and vice versa in the ovary and in other tissues; e.g., estradiol is......although some aromatase is present in adipose tissue, which is also an important source of estrogen in postmenopausal women. Estradiol, the most potent estrogen, is synthesized from testosterone. Estrone can be formed from estradiol, but its major precursor is androstenedione. Estriol, the weakest of the estrogens, is formed from both estrone and estradiol.
work of ButenandtIn 1929, almost simultaneously with Edward A. Doisy in the United States, Butenandt isolated estrone, one of the hormones responsible for sexual development and function in females. In 1931 he isolated and identified androsterone, a male sex hormone, and in 1934, the hormone progesterone, which plays an important part in the female reproductive cycle. It was now clear that sex hormones are...
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