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Chemical Structure [IMAGE PLACEHOLDER] Insert 2D chemical structure image here Image URL: Alt text: GHK-Cu molecular structure diagram showing copper coordination Source credit: PubChem Position: Center-aligned below heading 2D molecular structure (Source: PubChem) Technical Specifications The peptide’s structure features square-planar copper coordination involving the histidine imidazole nitrogen, glycine alpha-amino nitrogen, and deprotonated amide nitrogen from the glycine-histidine peptide bond, with additional coordination from neighboring lysine carboxyl groups in solution