title: Natural and synthetic narcotic drugs.
mesh_terms: D004723:Endorphins / Q000378:metabolism; D006801:Humans; D009020:Morphine / Q000138:chemical synthesis; D009292:Narcotic Antagonists / Q000494:pharmacology; D009294:Narcotics; D011955:Receptors, Drug / Q000378:metabolism
chemical_list: D004723:Endorphins; D009292:Narcotic Antagonists; D009294:Narcotics; D011955:Receptors, Drug; D009020:Morphine