Estrogen is defined as any of a number of female sex hormones. It is a hormone that produces female secondary sex characteristics and affects the menstrual cycle. Moreover, Estrogen is defined as class of steroid hormones that are more abundant in females than in males for most species; female sex hormone, produced by the ovaries, that is responsible for female sexual maturation ; female sex hormones involved in the regulation of ovulation and the menstrual cycle

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