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Differential staining of BALf cells. (a) Alveolar macrophages in the BALf collected 24 h postinstillation from sham; (b) and (c) alveolar macrophages engulfing particles (square arrows) and infiltration of PMNs (arrows) in the BALf collected 24 h after the last intratracheal instillation from PM1-treated mice. (a), (b), (c) bars = 50 μm.
