title: Initiation of parturition.
mesh_terms: D000818:Animals; D003238:Connective Tissue / Q000502:physiology; D003338:Corpus Luteum / Q000502:physiology; D004717:Endometrium / Q000378:metabolism; D005260:Female; D006041:Goats; D006801:Humans; D007745:Labor Onset; D007747:Labor Stage, First; D007743:Labor, Obstetric; D008253:Macaca mulatta; D009215:Myometrium / Q000502:physiology; D010053:Ovary / Q000378:metabolism; D010920:Placenta / Q000378:metabolism; D011247:Pregnancy; D011374:Progesterone / Q000502:physiology; D011453:Prostaglandins / Q000096:biosynthesis; D012377:Rodentia; D012756:Sheep; D014590:Uterine Contraction
chemical_list: D011453:Prostaglandins; D011374:Progesterone