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a TEM image of SNM@DOX. b DLS result of SNM@DOX in PBS. c The average diameters of SNM@DOX in different solutions. d CLSM images of HepG2 cells cultured with SNM@DOX for 4 and 9 h, respectively. The right images are the enlarged ones at the same time point. e Release profiles of DOX from SNM@DOX at different pH values. f Cytotoxicity of DOX∙HCl and SNM@DOX against HepG2 cells
