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Micrographs of lung tissues obtained from control mice and mice exposed to tobacco smoke for 7 days. Panel A shows the tracheal epithelium of a control mouse (left) and a mouse exposed to tobacco smoke for 7 days (right; magnification 400×). Arrows indicate hyperplasia of the epithelium. Panel B shows terminal bronchiole. Arrows indicate prominent Clara cells. Panel C shows the alveoli. Arrows indicate macrophages.
