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Created page with "== Overview == Progesterone is a steroid hormone that plays a critical role in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of hormones known as progestogens, and is the major naturally occurring human progestogen. thumb|center|A molecular model of progesterone.|class=only_on_mobile Image:Detail-65997.jpg|thumb|cente..."
