title: Acute tolerance to the excitatory effect of enkephalin microinjections into hippocampus.
mesh_terms: D000818:Animals; D002415:Cats; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004361:Drug Tolerance; D004569:Electroencephalography; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D006624:Hippocampus / Q000187:drug effects*; D008297:Male; D008845:Microinjections; D009270:Naloxone / Q000494:pharmacology; D051381:Rats
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone