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Confocal laser scanning microscopy (CLSM) of HepG-2 cells treated with DOX@Lys-His and free DOX·HCl with [DOX] = 0.5 μg/mL at different times. For each row, from left to right: DOX (red); cell nucleus stained by 4′,6-diamidino-2-phenylindole (DAPI) (blue); bright field and merged image.
