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. 2008 Jun 20;116(11):1500–1508. doi: 10.1289/ehp.11229

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Effect of Baltimore PM on histologic alterations in the lung on days 1 (A–D) and 7 (E–H) after treatment with Baltimore-PM. (A,E) PBS/PBS; (B,F) PBS/PM; (C,G) OVA/PBS; (D,H) OVA/PM. PM induced inflammatory leukocyte infiltration in both control mice (A) and OVA-challenged mice (D). PM residues are retained in alveoli. At 7 days, leukocyte infiltration declined to basal level (F, H). Tissues were stained with H&E; each panel is representative of paraffin sections from three A/J mice with the same treatment. Bars = 50 μm; bars in insets = 300 μm.