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Histopathological analysis of lung tissues of (a) PBS-injected control mice, (H and E, ×50) (b) hyperplasia in urethane-injected lung tissues, (H and E, ×50) (c) atypical adenomatous hyperplasia (AAH) in urethane-injected lung tissues, (H and E, ×50) (d) adenocarcinoma in urethane-injected lung tissues (H and E, ×50)
