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Paired serum ARDS biomarkers at day 0 and day 5 within MSCs and placebo groups. SP-D, IL-8 and IL-6 levels at day 0 and day 5 in the MSCs group (A, C, and E) and the placebo group (B, D and F) were determined by ELISA. Values are the measured concentrations for individual patients. p-values within each group between day 0 and day 5 were calculated using paired t-test.
