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. 2016 Sep 26;113(41):11436–11440. doi: 10.1073/pnas.1609618113

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Fig. 4. — (A) Bright-field image of a nanocapillary inserted into the cell. (B) The fluorescence intensity (R.F.U.) (intracellular calcium concentration) observed in the cells (n = 10) before and after capillary insertion and the application of voltage for egression of the solution. (C) The charges of the capillary before (trace a) and after (trace b) capillary insertion into the cell. (D) The difference in the charges after the extraction of the nonfaradic charge collected outside the cell using capillaries including glucose oxidase (trace a) or PBS alone (trace b). (E) The faradic charge collected in 29 HeLa cells. (F) The faradic charge collected in 27 starved cells.