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- Dictionarypro·ges·ter·one/prōˈjestəˌrōn/
noun
- 1. a steroid hormone released by the corpus luteum that stimulates the uterus to prepare for pregnancy.
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noun
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Progesterone (P4) is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of steroid hormones called the progestogens and is the major progestogen in the body. Progesterone has a variety of important functions in the body. Wikipedia