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MSCs ameliorated cell apoptosis in lung tissues of ALI rats. Representative sections of TUNEL staining of lung tissues in control, ALI, ALI+MSCs, and ALI+MSCs siRNA group (right panel). Apoptosis rate was calculated based on the percent of TUNEL positive cells of total cells (left panel). *P<0.5 vs control; #P<0.05 vs ALI.
