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The subcellular localization of MWCNT in HEK 293 cells. After being treated with MWCNTs at 100 µg/mL for 4 h, HEK 293 cells are fixed and sectioned for TEM bobservation. The MWCNTs are localized in endosomes (A,E), cytoplasm (B,F), lysosomes (C,G) and binding to cell membrane (D,H). Scale bar indicates 500 nm. The upper panel is MWCNT-COOH, the lower panel is MWCNT 41.
