moreover , naloxone reversible delta-type responses were obtained by local infusion of kelatorphan , ( [ ( r ) -3 ( n-hydroxylcarboxamido-2-benzylpropanoyl ) -l-alanine ] ) , a complete inhibitor of enkephalin catabolism , suggesting a tonic control of the behavioral activity of rat by the endogenous opioid peptides .
C0014298
enkephalin
C0205753
endogenous opioid peptides