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Histological analysis of lung sections at 12 weeks after systemic immunization with house dust mites. The lung sections stained with Periodic acid-Schiff (A-C) and Masson's trichrome (D-F). Slides were photographed at ×100 magnification. (A, D) Control 12 group, (B, E) CFA 7 group, and (C, F) CFA 12 group.
