title: Endogenous opioids. Histochemistry, neurophysiology, and pharmacology.
mesh_terms: D000698:Analgesia; D000818:Animals; D001519:Behavior / Q000187:drug effects; D001921:Brain / Q000378:metabolism; D002490:Central Nervous System / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D004594:Electrophysiology; D004723:Endorphins / Q000378:metabolism / Q000494:pharmacology / Q000502:physiology; D004743:Enkephalin, Leucine / Q000378:metabolism; D004745:Enkephalins / Q000378:metabolism; D006624:Hippocampus / Q000502:physiology; D006801:Humans; D011957:Receptors, Opioid / Q000032:analysis; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid; D004743:Enkephalin, Leucine; D001615:beta-Endorphin