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a A schematic of an intracellular electrochemical cytometry experiment showing placement of a carbon fiber electrode in the cytoplasm of a cell. b A SEM image of a nanotip conical carbon fiber microelectrode with a tip size of electrode about 100 nm and a tip length of 30–100 μm. c A representative amperometric trace of intracellular cytometry recording from a chromaffin cell [37]
