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Comparison of cytotoxicity induced by pharyngeal aspiration exposure to 0, 2.5, 10 and 40 µg/mouse of BMWCNT (A) or FMWCNT (B) at 1 and 7 days post-exposure. WLL fluid LDH activities were used as a marker of cytotoxicity. Values are given as means ± SE (n = 8). An asterisk (*) indicates that LDH activity for that group was significantly higher than control (p < 0.05).
