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Intracellular localization of dextran 70,000-coated SPIO-NPs labelled with rhodamine 123 in primary hippocampal neurons after 24 h of incubation. The rhodamine 123 fluorescence shows similar distribution as in the C6 cells: (a) rhodamine 123 labelling, (b) blue staining of nuclei with Hoechst 33342, (c) merge of images (a,b). Scale bar 20 µm.
