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Confocal microscopic images of HeLa cells treated with DOX@CeAP-L-PEG (Linker) or DOX@CeAP-SA-PEG (Control) with or without irradiation of 660 nm laser (150 mW/cm2). Nucleus was stained by DAPI (blue) and DOX was false-imaged as red. (scale bar = 50 μm)
