title: Acute morphine tolerance in new born and young rats.
mesh_terms: D000367:Age Factors; D000698:Analgesia; D000818:Animals; D000831:Animals, Newborn; D001812:Blood-Brain Barrier / Q000187:drug effects; D004361:Drug Tolerance; D005260:Female; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats
chemical_list: D009020:Morphine