title: Unidirectional non-cross tolerance to etorphine in morphine-tolerant mice and role of the blood-brain barrier.
mesh_terms: D000698:Analgesia; D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects*; D004343:Drug Implants; D004361:Drug Tolerance; D005048:Etorphine / Q000008:administration & dosage / Q000494:pharmacology*; D007276:Injections, Intraventricular; D007279:Injections, Subcutaneous; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009019:Morphinans / Q000494:pharmacology*; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D004343:Drug Implants; D009019:Morphinans; D005048:Etorphine; D009020:Morphine