<prompt> The type of estrogen found in highest concentration in adult female isEstroneEstriolEstradiolNone  <response>: b-Estradiol; 17b-estradiol; the most potent naturally occurring estrogen in mammals, formed by the ovary, placenta, testis, and possibly the adrenal coex; therapeutic indications for estradiol are those typical of an estrogen. a-Estradiol 17a-estradiol, exhibits considerably less biologic activity.Ref: Ganong;s review of medical physiology; 24th edition; page no: 406 