↑Huether SE, McCance KL (2019). Understanding Pathophysiology. Elsevier Health Sciences. p. 767. ISBN 978-0-32-367281-8. Estrogen is a generic term for any of three similar hormones derived from cholesterol: estradiol, estrone, and estriol.
↑Satoskar RS, Rege N, Bhandarkar SD (2017). Pharmacology and Pharmacotherapeutics. Elsevier Health Sciences. p. 943. ISBN 978-8-13-124941-3. The natural estrogens are steroids. However, typical estrogenic activity is also shown by chemicals which are not steroids. Hence, the term 'estrogen' is used as a generic term to describe all the compounds having estrogenic activity.
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