inotropic actions of the endogenous enkephalins , leucine enkephalin [ ( leu ] enkephalin ) and methionine enkephalin [ ( met ] enkephalin ) , and derivatives , [ d-ala2-methionine ] enkephalinamide ( damea ) and [ d ala2-leucine ] enkephalinamide ( dalea ) were tested , alone or in combination with noradrenaline ( na ) , ( +/- ) -isoprenaline or carbachol , on electrically-stimulated atria excised from sprague-dawley , fatty , zucker ( fa/fa ) and lean , hooded heterozygous ( fa/fa ) rats .
C0014298
enkephalins
C0014294
leu