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Representative results of β-catenin immunohistochemistry of the lungs of the control (A, B) and high-dose (C, D) groups. The β-catenin protein was localized at the membranes of the cell-cell borders in the background lung tissue (A–D), whereas cytoplasmic overexpression of the protein was found in the hyperplastic alveolar epithelial cells (C, D).
