title: Intracranial self-administration of the endocoid methionine-enkephalin.
mesh_terms: D000818:Animals; D004744:Enkephalin, Methionine / Q000494:pharmacology*; D008297:Male; D009270:Naloxone / Q000494:pharmacology; D009714:Nucleus Accumbens / Q000187:drug effects*; D051381:Rats; D011916:Rats, Inbred F344; D011957:Receptors, Opioid / Q000187:drug effects*; D017465:Receptors, Opioid, delta; D012653:Self Stimulation / Q000187:drug effects*; D012686:Septal Nuclei / Q000187:drug effects*
chemical_list: D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D009270:Naloxone; D004744:Enkephalin, Methionine