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Lung histology (hematoxylin and eosin stain) of 8-wk-old rats, showing inflammation in alveoli of rat exposed to unfiltered air (A) compared to alveoli of rat exposed to filtered air exposure (B). Similar histologic evidence of inflammation in bronchus of unfiltered air exposed rats (C) in reference to that of filtered air exposed rats (D). Higher-magnification micrograph indicates that inflammatory cells are mainly mononuclear cells (E).
