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Characteristics of fibrosis in the lungs of rats exposed to polyhexamethylene guanidine hydrochloride (PHMG-HCl). (A, B) In the control and low-dose groups, no collagen deposition was found in the fibrotic tissues of the lung. (C, D) In the mid-dose and high-dose groups, collagen deposition was observed and stained blue in the lung fibrotic tissues (arrow). Bars=100 μm, Magnification: ×200, MT staining.
