A method for chronic intravenous infusion in freely moving rats.
D000818:Animals; D001463:Barbiturates / Q000008:administration & dosage*; D002404:Catheterization; D006801:Humans; D007275:Injections, Intravenous; D009020:Morphine / Q000008:administration & dosage*; D009021:Morphine Dependence; D011589:Psychology, Experimental; D051381:Rats; D019966:Substance-Related Disorders
D001463:Barbiturates; D009020:Morphine