title: Pregnancy hormone mystery solved.
mesh_terms: D004092:20-alpha-Dihydroprogesterone / Q000097:blood / Q000378:metabolism / Q000502:physiology*; D000818:Animals; D005260:Female; D006736:Horses / Q000502:physiology*; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000502:physiology
chemical_list: D004092:20-alpha-Dihydroprogesterone