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thaliana (Machens et al., 2014)

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Copper ions delivered by GHK-Cu also demonstrate up to 90% inhibition of type 1 5-alpha reductase at specific concentrations

Interestingly, their analysis demonstrated that different GS-like enzymes accepted various alternate nucleophiles, including d-serine, non-natural amino acids, and alpha-amino alcohols, to yield a range of glutathione variants, but did not produce either serine- or glutamate-substituted analogs