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Hematoxylin and eosin–stained sections of lung tissue from (A) untreated controls and from endotoxin-treated animals at (B) 2 hours, (C) 6 hours, and (D) 24 hours. Evidence for influx of neutrophils is observed near the airway (arrow) at 2 hours. Diffuse inflammation is observed at 6 hours and at 24 hours (arrows).
