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Schematic representation of the pathway of electrons (red arrows) through the enzyme in the case of a cathodic current flowing through the electrode. Cyt cox is reduced to form Cyt cred by the electrochemical reduction, as shown by the dotted black arrow (Eq. 2 in the text). Electrons travel in the direction opposite from Cyt cred to oxygen catalyzed by the enzyme, thereby regenerating cyt cox (Eq. 1).
