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Lung pathology of the challenged mice. Paraformaldehyde (4%) was added to fix the lung tissues collected from challenged mice. The tissues were then paraffin-embedded, sectioned, and stained with hematoxylin-eosin. A digital slide scanner (3DHISTECH, Hungary) was used for image scanning. The black arrow indicates alveolar septal thickening, while the red arrow indicates inflammatory cell infiltration.
