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Absorbance changes of the d–d band triggered by GSH introduction into a solution of 0.50 mM GHK with 0.45 mM Cu(II) (606 nm, black squares), 50 mM imidazole (565 nm, green triangles), and 0.50 mM GGH-am with 0.45 mM Cu(II) (525 nm, blue circles).
