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Visual depiction of SM–mediated cast formation upon lung microdissection. Large airways were sectioned for visual inspection of airway cast formation. Airway sections from the left lung are shown above from representative treatment groups, depicting visible airway blockages. Sham exposed animals representing normal airways (A) are shown in comparison to SM + 10150 (B) and SM + PBS (C). Circles indicate airways and arrows identify pseudomembranes.
