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Progesterone. Print | Email article to a friend | Last updated: January 14, 2015. Progesterone is a hormone released by the corpus luteum in the ovary. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. It may also be involved in the growth of certain cancers.
Progesterone is a steroid hormone that binds to intracellular progesterone receptors that act in the nucleus of cells. Progesterone is produced in males by the adrenal glands and males have the same plasma level of progesterone as women d o during the follicular phase of the menstrual cycle.rolactin initiates and maintains lactation in the estrogen primed breast. Prolactin is not a growth factor in breast tissue which is why it is necessary for breast tissue to be primed by the growth promoting action of estrogen in order for prolactin to exert its effects.