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Representative photographs of bronchoalveolar lavage fluids (BALF) from the control (A), 0.2mg/m3 (B), 1mg/m3 (C), and 5mg/m3 (D) in exposure groups stained with a Diff-Quick staining solution (400 ×). Lymphocyte infiltration (arrow), neutrophil infiltration (arrowhead), and morphological changes of alveolar macrophages (foamy; white arrowhead) were shown.
