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Histopathological image of lung damage; A) Grade 1 lung injury: normal lung histology, B) Grade 2 lung injury: mild neutrophil infiltration of leukocytes (arrow), C) Grade 3 lung injury: moderate neutrophil leukocyte infiltration, perivascular edema formation, the partial destruction of lung structure (arrow), D) Grade 4 lung injury: intensive neutrophil leukocyte infiltration, which defines complete destruction in the pulmonary structure (arrow), (x200; hematoxylin & eosin.
