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c-kit siRNA improves airway mucus clearance. Lung tissue sections at day 26 from mice administered PBS vehicle (A), scrambled siRNA (B), or c-kit siRNA (C); sections were obtained from fixed, paraffin-embedded lung tissue stained with periodic acid-Schiff reagent. Black arrowheads indicate mucus-containing goblet cells. Original magnification, ×400. The experiment was carried out three times; representative images are shown.
