title: Endogenous opiates and pain.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D004723:Endorphins / Q000032:analysis* / Q000037:antagonists & inhibitors; D004745:Enkephalins / Q000032:analysis; D006168:Guinea Pigs; D000882:Haplorhini; D006801:Humans; D051379:Mice; D009270:Naloxone / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology; D059408:Pain Management; D051381:Rats; D011957:Receptors, Opioid / Q000032:analysis
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid; D009270:Naloxone