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Changes of airway epithelial tissue yielded in the experimental mice with CS-induced lung injury. The lung bronchiole sections of CS-exposed WT and ACE2-/- mice were stained with haematoxylin-eosin (H&E). The non-CS treated mice were defined as the control group. Relative to the control mice, there were increases in the infiltration of white blood cells around the airway and airway epithelial thickening in the CS-exposed WT and ACE2-/- mice.
