Fig. 1

H&E and immunohistochemistry in mouse lung tissue exposed to radon. A Representative H&E and immunohistochemistry staining images of caspase-3 in normal mouse lung tissues and exposure samples. Black arrow indicates inflammatory cell in the alveolus interval, red arrow indicates alveolar septal fracture, black arrow indicates positive cells. B Western blot analysis of caspase-3 expression in mouse lung tissue