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Percent association of pristine and COOH-functionalized MWCNTs with A549 cells in RPMI cell medium with 10% FBS (a) and with BEAS-2B cells in BEGM cell medium (b). The value of cellular uptake was expressed as percentage of total MWCNT added to the well (mean ± SD). ∗P ≤ 0.05, MWCNT-COOH versus MWCNTs.
