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    Proc Natl Acad Sci U S A. 1976 Jul;73(7):2515-9.

    Morphine-like peptides in mammalian brain: isolation, structure elucidation, and interactions with the opiate receptor.

    Simantov R, Snyder SH.

    A substance that competes for opiate receptor binding has been isolated from calf brain and identified as two pentapeptides, H-Tyr-Gly-Gly-Phe-Met-OH (methionine enkephalin) and H-Tyr-Gly-Gly-Phe-Leu-OH (leucine enkephalin), with about four times more leucine enkephalin than methionine enkephalin. Sodium and manganese effects on opiate receptor interactions show that both peptides are agonists, whereas leucine enkephalin may be a "purer" agonist than methionine enkephalin.

    PMID: 1065904 [PubMed - indexed for MEDLINE]

    PMCID: 430630

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