The prostaglandins.
D000028:Abortion, Induced; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D003267:Contraception; D003338:Corpus Luteum / Q000502:physiology; D004285:Dogs; D005260:Female; D005750:Gastric Juice / Q000378:metabolism; D006439:Hemodynamics / Q000187:drug effects; D006727:Hormone Antagonists; D006736:Horses; D006801:Humans; D007249:Inflammation; D007751:Labor, Induced; D008297:Male; D010060:Ovulation; D011247:Pregnancy; D011453:Prostaglandins / Q000032:analysis / Q000502:physiology / Q000627:therapeutic use; D011817:Rabbits; D009435:Synaptic Transmission
D006727:Hormone Antagonists; D011453:Prostaglandins