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Confocal microscopy images of MCF‐7 cells incubated with CDs‐DOX (A, B, C and D) and free delivery of doxorubicin (DOX) (E, F, G and H) for 4 h, respectively. The cell nuclei were stained with DAPI and the concentration of DOX was 1 μg mL−1. The cell nuclei, DOX and carbon dots exhibited blue, red and green fluorescence, respectively. The scale bars are 25 μm in all the images
