title: Letter: Prostaglandins.
mesh_terms: D000818:Animals; D003338:Corpus Luteum / Q000502:physiology; D005260:Female; D006736:Horses; D011460:Prostaglandins F / Q000502:physiology*; D012756:Sheep; D014599:Uterus / Q000502:physiology
chemical_list: D011460:Prostaglandins F