Fig. 4

Accumulation of AG-QDs in the nucleus as imaged by confocal microscopy The NR8383 cells were incubated with AG-QDs (200 μg/mL) for 24 h before imaging. a: Fluorescence image under 405-nm excitation and 438-nm emission (blue). b: The merged fluorescence and bright field images. c: Fluorescence intensity of AG-QDs in NR8383 cells (as shown in panel (a)) at different cell depths along the z axis (z = 0, 2, 4, 6, 8, 10, 12 and 15 μm)