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Hematoxylin and eosin-stained lung tissue (original magnification, ×40). Lung tissue sections obtained from contused portion of the right mouse lung at 0, 6, 24, 48, and 72 hours after lung contusion. There is dense infiltration of inflammatory cells into the lung parenchyma and collapse of the alveoli within 6 hours after lung contusion. By 24 hours this cellular infiltration has peaked and resolution occurs from 24 to 72 hours after traumatic injury.
