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. 2015 Dec 16;5:18447. doi: 10.1038/srep18447

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Cyclic voltammograms of films containing melanin samples (scan rate of 2 mV/s) in the presence of 3 mediators. The paired amplification in oxidation and reduction currents provides evidence that the natural melanins are redox-active and can undergo both oxidative and reductive redox-cycling.