title: Further studies on the development of tolerance to the analgesic effect of morphine: the role played by the cylinder in the hot plate testing procedure.
mesh_terms: D000180:Acrylic Resins; D000698:Analgesia; D000704:Analysis of Variance; D000818:Animals; D004361:Drug Tolerance; D008297:Male; D008722:Methods; D009020:Morphine / Q000494:pharmacology*; D010600:Pharmacology / Q000295:instrumentation*; D051381:Rats; D011930:Reaction Time / Q000187:drug effects
chemical_list: D000180:Acrylic Resins; D009020:Morphine