the binding characteristics of two highly potent analgesic enkephalin analogs , [ d-thr2 , thz5 ] -and [ d-met2 , thz5 ] -enkephalinamide , to the rat brain membrane preparation have been investigated using tritiated leu-enkephalin , human beta-endorphin or dihydromorphine as the primary ligand .
C0014298
enkephalin
C0014294
leu-enkephalin