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Cell uptake and cytotoxicity of Fe3O4@Au NPs. (a) Intracellular localization of endo/lysosomes (red) and Fe3O4@Au NPs (green) using confocal laser scanning microscopy images, (scale bar: 10 μm); (b) Quantitative analysis of fluorescence intensity of Fe3O4@Au NPs for 3 h with or without magnetic field; (c) Endocytic inhibition effect after treatment with various inhibitors. * p < 0.05 versus NP group.
