A formalin-fixed left lower lung lobe tissue sample was prepared from each animal. Samples were dehydrated and embedded in Paraplast (Leica Microsystems GmbH, Wetzlar, Germany). The tissues were cut into 4-μm-thick sections and stained with H&E. Lung neutrophil infiltration was examined by a pathologist who was blinded to the group allocation under a light microscope.
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