title: Do the brain's own endorphins mediate pain inhibition?
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D002940:Circadian Rhythm; D004723:Endorphins / Q000502:physiology*; D009270:Naloxone / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology*; D051381:Rats; D011957:Receptors, Opioid / Q000032:analysis
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid; D009270:Naloxone