title: Enhancement of etorphine brain concentrations and changes in etorphine-naloxone pA2 values in morphine-pretreated mice.
mesh_terms: D000700:Analgesics; D000818:Animals; D001665:Binding Sites; D001921:Brain / Q000378:metabolism*; D005048:Etorphine / Q000378:metabolism* / Q000494:pharmacology; D008297:Male; D009019:Morphinans / Q000378:metabolism*; D009020:Morphine / Q000378:metabolism / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology*; D051381:Rats
chemical_list: D000700:Analgesics; D009019:Morphinans; D009270:Naloxone; D005048:Etorphine; D009020:Morphine