leucine-enkephalin
noun
leu·cine-en·keph·a·lin
| \ ˈlü-ˌsēn-en-ˈkef-ə-lən
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Medical Definition of leucine-enkephalin
: a pentapeptide having a terminal leucine residue that is one of the two enkephalins occurring naturally in the brain
— called also Leu-enkephalin