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doi:10.1177/0884533609332174

They share a common peptide ancestor, but they are structurally and mechanistically different enough that understanding the distinction is essential for experiment design and result interpretation

Walls AC, Fiala B, Schfer A, Wrenn S, Pham MN, Murphy M, et al

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PMID: 26236730 Published Research Highlights Discovery 1973 Tripeptide Identified in Human Serum Pickart and Thaler first identified the GHK sequence in human plasma, discovering a tripeptide that prolonged survival of normal liver cells and stimulated growth in cell culture models