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(a) Representative amperometric response of glucose microbiosensors based on unmodified, Pt-black and GrOx/Pt-black microelectrodes at +500 mV (arrows indicated addition of 100 μM glucose). (b) Histogram showing the major electrochemical parameters of unmodified Pt, Pt-black and GrOx/Pt-black microelectrodes (error bars represented standard error of the mean).
