the antinociceptive effects obtained in arthritic rats with morphine , the opioid mu-agonist dago [ d-ala2 , mephe4 , gly-ol5 ] enkephalin , the delta-selective agonist dtlet [ d-thr2 , leu5 ] enkephalyl-thr , and the kappa-agonist u-50,488h were compared to their corresponding effects in normal animals and morphine-pretreated arthritic rats , respectively , using a paw pressure test .
C0525773
dago
C0014298
enkephalin