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Pentapeptide endorphins, found in many parts of the brain, that bind to specific receptor sites, some of which may be pain-related opiate receptors; hypothesized as endogenous neurotransmitters and nonaddicting analgesics. Metenkephalin is Tyr-Gly-Gly-Phe-Met; leuenkephalin has Leu in place of Met; proenkephalin has Pro in place of Met.
Farlex Partner Medical Dictionary © Farlex 2012
metenkephalinOne of the several ENDOGENOUS opium-like substances having a sequence of five amino acids. See also ENDORPHINS.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005