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Pentapeptides with opiate-like activity (compare withendorphins), first isolated in 1975 from pig brain. Met-enkephalin has the amino acid sequence Tyr-Gly-Gly-Phe-Met; Leu-enkephalin has the sequence Tyr-Gly-Gly-Phe-Leu. See polyprotein.

Subjects: Chemistry.

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