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Optical microscopy images of HeLa cells incubated with FITC (A); FITC-SWCNT-FA at 37 °C (B) or 4 °C (C); and FITC-SWCNT-FA in the presence of free FA (denoted as Block, D). Confocal fluorescence images (top) and transmittance images (bottom). Scale bar, 50 μm.
