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Interestingly, GHK alone appeared to produce a comparable stimulatory action, while copper(II) ions in isolation may indicate no such activity, suggesting the tripeptide moiety may be the primary active component, possibly reforming complexes with trace copper present in the culture medium

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These enzymes include catalase, glutathione peroxidase, and other peroxidases such as cytochrome c peroxidase and NADH peroxidase [2]

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