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Haematoxylin and eosin staining of lung sections demonstrated attenuated lung injury in the MSCs treatment group at day 3 after instillation of endotoxin. (A, B) PBS-treated group. (C, D) MSCs-treated group. (E, F) Normal control. Histopathological changes in the lungs are shown at low (×100 for A, C, E) and high (×400 for B, D, F) magnification of the black boxed area on the left.
