the analysis of the functions of the enkephalinergic system can now be investigated by using recently designed selective mu ( dago , trimu 5 ) , delta ( dtlet , depdpe ) , kappa ( u 50 , 488 ) agonists or antagonists ( ici 174 , 864 for the delta type ) and kelatorphan a complete inhibitor of enkephalin metabolism .
C0525773
dago
C0014298
enkephalin