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The N-terminal glycine amino group donates one nitrogen ligand to the copper, the imidazole nitrogen of the histidine side chain donates a second nitrogen ligand, and the deprotonated amide nitrogen of the Gly-His peptide bond donates a third nitrogen ligand

[2][3][5] Matrix Metalloproteinase (MMP) Modulation: GHK-derived peptides are studied for how they affect matrix metalloproteinases (MMPs) and their inhibitors

Tension: If youre nervous about getting a shot and tense up your arm muscles, it might hurt more afterward