title: Physical dependence in rats after low morphine doses.
mesh_terms: D000818:Animals; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D009021:Morphine Dependence / Q000503:physiopathology* / Q000523:psychology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D009020:Morphine