The prostaglandins.
D000028:Abortion, Induced; D005260:Female; D006801:Humans; D007743:Labor, Obstetric / Q000187:drug effects; D008297:Male; D011247:Pregnancy; D011453:Prostaglandins / Q000494:pharmacology / Q000502:physiology; D012098:Reproduction / Q000187:drug effects
D011453:Prostaglandins