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The structural difference is a single amino acid substitution at the first position: GHK-Cu uses glycine (Gly-His-Lys:Cu), while AHK-Cu uses alanine (Ala-His-Lys:Cu)
It is part of an important antioxidant system in cells and is a heterodimer composed of two subunits, SLC7A11 and SLC3A2
This visual cue is one of the most underrated quality-control checks in peptide research and it is a reason to insist on suppliers who explicitly verify copper content
Zakai NA, McClure LA, Prineas R, et al
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