title: In vivo interaction of morphine and endogenous opiate-like peptides.
mesh_terms: D000818:Animals; D004347:Drug Interactions; D004723:Endorphins / Q000134:cerebrospinal fluid*; D004745:Enkephalins / Q000134:cerebrospinal fluid* / Q000276:immunology; D006801:Humans; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D011863:Radioimmunoassay; D051381:Rats; D013239:Stereotyped Behavior / Q000187:drug effects; D013997:Time Factors
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone; D009020:Morphine