mu- , delta- and kappa-receptor-active opiates were demonstrated in brain , pancreas and liver extracts by displacement studies using selective ligands for the three opiate receptor subtypes [ ( 3h ] [ d-ala2 , mephe4 , gly5-ol ] enkephalin , [ 3h ] [ d-ala2 , d-leu5 ] enkephalin and [ 3h ] dynorphin respectively ) .
C0064239
kappa-receptor
C0034801
opiate