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Cytotoxicity of A549 ((a), (c)) and BEAS-2B ((b), (d)) cells after 24 h exposure to pristine MWCNTs and MWCNT-COOH. ((a), (b)) Viability percentage; ((c), (d)) cell membrane damage. Data represent the means of three independent experiments. Unexposed cells were used as control. ∗P ≤ 0.05.
