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. 2009 Jun 29;117(11):1682–1689. doi: 10.1289/ehp.0900730

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Number of neutrophils in BALF 18 hr postexposure to NR and FR PM (n = 7 mice/group). Abbreviations: C, coarse; F, fine; SAL, saline; U, ultrafine. Error bars indicate SE.

**p < 0.01 compared with saline.