its potency in the displacement of the bound mu-ligand , 3h-labelled ( d-ala2 , mephe4 , gly-oh5 ) -enkephalin ( [ 3h ] dago ) , to rat brain homogenates was somewhat lower ( ki of 0.8 nm ) but still high when compared with its ability to displace the delta-ligand , 3h-labelled ( d-ser2 , thr6 ) -leu-enkephalin ( [ 3h ] dslet ) to rat brain homogenates ( ki of 4.45 nm ) .
C0014298
enkephalin
C0525773
dago