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Histopathological staining of the lungs in male rats exposed to SM for 2 weeks by inhalation. No specific abnormal findings were noted in the lungs. a, alveoli; b, bronchiole. (A) Control group; (B) low-exposure group; (C) medium-exposure group; (D) high-exposure group; H&E staining. Magnification = ×100 for all images.
