[ d-ala2 , met5 ] -enkephalinamide and [ d-ala2 , d-leu5 ] -enkephalin , degrading-enzyme-resistant derivatives of methionine-enkephalin and leucine-enkephalin , respectively , significantly attenuated both environment-induced conditioned suppression of motility and forced swimming-induced immobility in a dose-dependent manner .
C0014298
enkephalin
C0014295
methionine-enkephalin