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Progesterone (abbreviated as P4), also known as pregn-4-ene-3,20-dione,<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species.<ref name="KingBrucker2010">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> It belongs to a group of steroid hormones called the progestogens,<ref name="KingBrucker2010" /> and is the major progestogen in the body. Progesterone is also a crucial metabolic intermediate in the production of other endogenous steroids, including the sex hormones and the corticosteroids, and plays an important role in brain function as a neurosteroid.<ref name="pmid11108866">{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref>


Progesterone sections
Intro  Chemistry  Sources  Metabolism  Levels  Function  Medical uses  Chemical synthesis  References  Additional images  External links  

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