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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 C57BL/6 mice by TiO₂‑P25 (A), TiO₂-A (B), or TiO₂‑NB (C) evaluated in four labs (ML1, ML2, ML3, and ML4). Values are the mean ± SE percentage of neutrophils in BALF 1 day after exposure to DM only (control) or TiO₂ ENMs at 40 µg/50 µL. *p < 0.05, **p < 0.01, and ^#p < 0.001 compared with controls.