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Time course of tyrosinase-catalyzed oxidation of (A) DA, (B) DA with GSH, (C) DA with N-acetyl-l-cysteine (NAC), (D) DA with DPRA(Cys) (a heptapeptide containing 1 Cys residue, Ac–RFAACAA–COOH), (E) DA with BSA, and (F) DA with βLG. The inserted figures show the kinetic monitoring at indicated absorption wavelength (nm).
