. . . . . . . "442009113"^^ . . . . . "Leu-enkephalin"@en . . . . . . . "[Leu]enkephalin; [Leu5]enkephalin;"@en . . . . . . . "changed"@en . . . . . . . . . . . . . "[Leu]enkephalin;[Leu5]enkephalin;"@en . . . . . "Leu-enkephalin is an endogenous opioid peptide neurotransmitter with the amino acid sequence Tyr-Gly-Gly-Phe-Leu that is found naturally in the brains of many animals, including humans. It is one of the two forms of enkephalin; the other is met-enkephalin. The tyrosine residue at position 1 is thought to be analogous to the 3-hydroxyl group on morphine. Leu-enkephalin has agonistic actions at both the \u03BC- and \u03B4-opioid receptors, with significantly greater preference for the latter. It has little to no effect on the \u03BA-opioid receptor."@en . . . "Leu-enkephalin is an endogenous opioid peptide neurotransmitter with the amino acid sequence Tyr-Gly-Gly-Phe-Leu that is found naturally in the brains of many animals, including humans. It is one of the two forms of enkephalin; the other is met-enkephalin. The tyrosine residue at position 1 is thought to be analogous to the 3-hydroxyl group on morphine. Leu-enkephalin has agonistic actions at both the \u03BC- and \u03B4-opioid receptors, with significantly greater preference for the latter. It has little to no effect on the \u03BA-opioid receptor."@en . . . "changed"@en . . "-2"^^ . . . . . . . "1051001284"^^ . . . . . "(2R)-2-(2R)-2-[[2-[[2-[[(2R)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-4-methylpentanoic acid"@en . . "13495833"^^ . "5170"^^ . . "Leu-enkephalin Structure.svg"@en . . . . . . . "300"^^ . . .