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Representative histochemical and immunohistochemical staining in lung tissue (H and E, Masson's trichrome, and M30) micrographs of experimental groups. (a) represented H&E, (b) represented Masson's trichrome, and (c) represented M30 immunohistochemistry stained sections. (★) showed mononuclear cell infiltration (white arrows) resembled collagen content of the parenchyma; (black arrows) represented M30 positive cells.
