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

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Effects of PM-induced mucus secretion in murine airways. Paraffin sections of the lung were stained with periodic acid-Schiff (PAS) to detect presence of goblet cells and activity at 4 days after Baltimore PM treatment. (A) PBS/PBS; (B) PBS/PM; (C) OVA/PBS; (D) OVA/PM. Each panel is representative of paraffin sections from three A/J mice in the same treatment group. PM or OVA induced PAS-positive purple staining. PM and OVA induced PAS-positive purple staining synergistically. Bars = 50 μm.