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Lung tissue TEM images in the high dose exposed group at three days following intratracheal instillation. (A) Accumulation of alveolar macrophages and neutrophil cells in alveolar space; (B) accumulation of alveolar macrophages with vacuoles; (C) neutrophil cell and inflammatory cells; and (D) magnified image of boxed area in (C). Arrow: black particles formed aggregates in the cell organelles.
