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LogoWarningBox4.pngIn biochemistry the term Leu-enkephalin strictly means Leu-Tyr-Gly-Gly-Phe-Xaa, representing N-terminal extension of the Tyr-Gly-Gly-Phe-Xaa enkephalin chain and the Wikimedia inability to accept "[" in a name aggravates this issue, although the literature is full of it but sometimes uses the term Leu enkephalin which is allowed

[Leu]-enkepalin ([Leu5]enkephalin, Leu enkephalin) is a neurotransmitter Tyr-Gly-Gly-Phe-Leu.