kd-values and binding site concentrations , for the interaction of human and bovine beta-casomorphins with opioid receptors in rat brain homogenates were determined in inhibition experiments , using [ 3h ] - ( d-ala2 , mephe4 , gly-ol5 ) enkephalin , [ 3h ] - ( d-ala2 , d-leu5 ) enkephalin and [ 3h ] ethylketazocin as mu- , delta- and kappa-opioid receptor ligands .
C0034801
opioid receptors
C0064239
kappa-opioid