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Cyclic voltammograms of (a) unmodified AnGOx-I489K in the absence of glucose. (b) Unmodified AnGOx-I489K in the presence of 33 mM glucose. (c) PES-modified AnGOx-I489K in the absence of glucose. (d) PES-modified AnGOx-I489K in the presence of 33 mM glucose. Scan rate 50 mV/s. Arrows: peaks due to PES.
