title: Brain peptides with opiate antagonist action: their possible role in tolerance and dependence.
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D055598:Chemical Phenomena; D002621:Chemistry; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance; D004745:Enkephalins / Q000138:chemical synthesis / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors*; D009021:Morphine Dependence / Q000378:metabolism*; D009022:Morphine Derivatives; D010455:Peptides / Q000302:isolation & purification*; D051381:Rats; D014020:Tissue Extracts / Q000494:pharmacology; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D004745:Enkephalins; D009022:Morphine Derivatives; D010455:Peptides; D014020:Tissue Extracts; D009020:Morphine