pretreatment of the membranes with kappa-selective compounds [ ethylketocyclazocine ( ekc ) , dynorphin ( 1-13 ) , or u-50,488h ] but not with [ d-ala2 , n-me-phe4 , gly5-ol ] enkephalin ( dago ; mu specific ligand ) or [ d-ala2 , n-me-phe4 , gly5-ol ] enkephalin ( dadle ; delta specific ligand ) strongly protects the binding of the radioligands against nem inactivation .
C0525773
dago
C0014298
enkephalin