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TEM characterization of MWCNTs internalization and their distribution in subcellular organelles. Macrophages were incubated with MWCNT 1 (A, B, C, 97.6 μg/mL) or 2 (D, E, F, 95.9 μg/mL) for 24 hrs. A and D: cytoplasm; B and E: endosome; C and F: lysosome. Arrows point to MWCNTs. Scale bars represent 100 nm.
