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Fluorescence imaging of CuInS2-ZnS-GSH QDs stained HeLa cells treated with different concentrations of etoposide for 2 h. From (A) to (D), the concentrations of etoposide were 0, 10, 50, and 100 μmol L–1, respectively. The matched bright-field images (a–d) were also obtained. The scale bars indicate 20 μm.
