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Nature 503 , 267271 (2013)

The histidine imidazole and the N-terminal amine and lysine side chain give GHK a high intrinsic affinity for copper(II), and as the free apo-peptide it has been studied in preclinical and in vitro research as a copper-binding ligand and as a signaling molecule implicated in extracellular-matrix remodeling, collagen and metalloproteinase regulation, and antioxidant and anti-inflammatory gene-expression pathways

These markers include both the presence and absence of a range of functional and biochemical characteristics, such as transport systems, and an array of structural and functional molecules

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