Estrogen is the main female sex hormone that is secreted mainly from the ovaries. Chemically estrogens are steroids. Estrogens are secreted in all vertebrates and even in some arthropods.
Oestrogen -Estrone was isolated in 1929 for the first time.
Oestrogen originates from Ancient Greek ‘oestros’ ( a periodic state of sexual activity in female mammals) + ‘genos’ (generating). The term was used in 1920
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