title: Neural mechanisms of opiate analgesia.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D001923:Brain Chemistry; D001933:Brain Stem / Q000502:physiology; D004723:Endorphins / Q000502:physiology; D004745:Enkephalins / Q000502:physiology; D006801:Humans; D009020:Morphine / Q000494:pharmacology*; D009294:Narcotics / Q000494:pharmacology*; D010146:Pain; D051381:Rats; D011957:Receptors, Opioid / Q000502:physiology*; D013373:Substance P / Q000032:analysis
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009294:Narcotics; D011957:Receptors, Opioid; D013373:Substance P; D009020:Morphine