title: Central mechanisms of opioid analgesia.
mesh_terms: D015670:Acupuncture Therapy; D000698:Analgesia; D000818:Animals; D001923:Brain Chemistry; D004723:Endorphins / Q000502:physiology*; D004745:Enkephalins / Q000502:physiology; D000882:Haplorhini; D051379:Mice; D011957:Receptors, Opioid / Q000502:physiology*
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid