title: Des-tyrosine-dynorphin antagonizes morphine analgesia.
mesh_terms: D000700:Analgesics / Q000037:antagonists & inhibitors; D000818:Animals; D004723:Endorphins / Q000494:pharmacology*; D007276:Injections, Intraventricular; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000700:Analgesics; D004723:Endorphins; D009020:Morphine