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GHK-Cu's repair-while-you-protect story directly addresses this concern

That is the part of peptide research that does not show up in the textbooks but determines whether the work is reproducible

One theory put forward by Clevers et al

[43] See also [edit] Reductive stress Glutathione synthetase deficiency Ophthalmic acid roGFP, a tool to measure the cellular glutathione redox potential Glutathione-ascorbate cycle Bacterial glutathione transferase Thioredoxin, a cysteine-containing small protein with very similar functions to reducing agents Glutaredoxin, an antioxidant protein that uses reduced glutathione as a cofactor and is reduced nonenzymatically by it Bacillithiol Mycothiol -L-Glutamyl-L-cysteine References [edit] 1 2 3 4 CRC Handbook of Chemistry and Physics (97th ed.)