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(A–F) Immunohistochemical staining of proliferating cell nuclear antigen (PCNA)-positive cells in the lung tissues of C57BL/6 and BALB/c mice on days 0, 7, and 14 postviral infection. Positive cells were more abundant in the bronchial epithelial cells and interstitial tissues in the lungs. Red arrows indicate PCNA-positive cells.
