title: Central infusion of rats with agents selective for different types of opioid receptor.
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects / Q000502:physiology*; D008297:Male; D009270:Naloxone / Q000494:pharmacology*; D009294:Narcotics / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011957:Receptors, Opioid / Q000187:drug effects / Q000502:physiology*; D013239:Stereotyped Behavior / Q000187:drug effects*; D013329:Structure-Activity Relationship
chemical_list: D009294:Narcotics; D011957:Receptors, Opioid; D009270:Naloxone