title: Enhanced analgesic activity of D-Ala2 enkephalinamides following D-isomer substitutions at position five.
mesh_terms: D000700:Analgesics; D000818:Animals; D004597:Electroshock; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000032:analysis / Q000494:pharmacology*; D000882:Haplorhini; D008297:Male; D009020:Morphine / Q000494:pharmacology; D051381:Rats; D011930:Reaction Time / Q000187:drug effects; D011957:Receptors, Opioid / Q000378:metabolism
chemical_list: D000700:Analgesics; D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid; D009020:Morphine