the analgesic activity of the prototypic opioid peptides for the mu ( d-ala2-me-phen4-gly-ol5-enkephalin [ dago ] ) kappa ( dynorphin 1-13 ) , delta ( d-ala2-d-leu5-enkephalin [ dadle ] ) , or epsilon ( beta-endorphin ) receptor was assessed in a rat tooth pulp stimulation procedure .
C0525773
dago
C0014298
enkephalin