Dictionary of Human Evolution and Biology

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Progesterone

Principal progestational steroid hormone of the body, liberated by the corpus luteum and placenta and in minute amounts by the adrenal cortex. Progesterone prepares the uterus for the reception and development of the blastocyst by transforming the endometrium from the proliferative to the secretory stage and maintains an optimal intrauterine environment for sustaining pregnancy; influences metabolism in the mammae. Progesterone of placental origin has the same functions. Aka progestational hormone.

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