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Electron microscope examination. (a) In control group: Granular dens stractures in alvoalar space (black arrow). Notice thick basal lamina on blood-air barrier area (white arrow) and increased intracytoplasmic vacualization of type II pneumocyte (thick white arrow), (b) In heliox group: Alveolar macrophage (black arrow) and increased type II pneumocytes (white arrow)
