Analgesic tolerance to etorphine (M99) and morphine in the mouse.
D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D004361:Drug Tolerance; D005260:Female; D007274:Injections, Intraperitoneal; D007279:Injections, Subcutaneous; D051379:Mice; D009020:Morphine / Q000494:pharmacology
D000700:Analgesics; D009020:Morphine