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Phase contrast micrographs showing A549 cell cultures. (a) Untreated cells. (b–f) Bundle-like agglomerates covering cell surface after 24 h exposure to 100 μg/mL. (b) MWCNTs, (c) MW-COOH, (d) MW-NH2, or (e) CB; (f) absence of agglomeration after exposure to SiO2 (100 μg/mL). Objective magnification: 32x (×4).
