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Fluorescence signal of NPs in cells. HeLa cells grown on glass cover-slips were incubated for 20 h with no NPs (medium alone), 2NP or 3NP, as indicated and analyzed by fluorescence confocal microscopy with the same instrumental setting for comparison. Representative images are shown. In the case of 2NP cell signal distribution details are shown at higher magnification. Bars are the standard deviations of the means.
