to examine the kinetics of opioid receptor binding , the agonists [ d-ala2-d-leu5 ] enkephalin ( dadl ) and [ d-ala2-mephe4-gly-ol5 ] enkephalin ( dago ) and the antagonists diprenorphine and naltrexone were used with bovine hippocampal synaptic plasma membranes .
C0014298
enkephalin
C0525773
dago