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Nature. 1975 Dec 18;258(5536):577-80. doi: 10.1038/258577a0.

Identification of two related pentapeptides from the brain with potent opiate agonist activity.

Hughes J, Smith TW, Kosterlitz HW, Fothergill LA, Morgan BA, Morris HR

https://doi.org/10.1038/258577a0

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