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. 2013 May 6;121(6):676–682. doi: 10.1289/ehp.1205693

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Stimulation of neutrophilic inflammation in the lungs of mice by O-MWCNT (A), P-MWCNT (B), or F-MWCNT (C) evaluated in four labs (ML1, ML2, ML3, ML4). Values shown are the mean ± SE percentage of neutrophils in BALF 1 day after exposure to DM only (control) or MWCNTs at 40 µg/50 µL. (A) Significant increase induced by O-MWCNT in all four labs. (B) Significant increase induced by P-MWCNT in two labs. (C) Significant increase induced by F-MWCNT in three labs, F-MWCNT albeit to a lesser extent than that induced by O-MWCNT. *p < 0.05, **p < 0.01, and ^#p < 0.001 compared with controls.