In addition, the proportion of Treg in the LPS + mBM-MSC and LPS + mBM-MSC-NC groups was significantly lower than that in the ARDS group (p < 0.05), and the proportion in the LPS + mBM-MSC-TGFβ1 group was significantly higher than that in the LPS + mBM-MSC-NC group (p < 0.05) and even higher than that in the ARDS group (p < 0.05, Fig. 4c). This evidence concerns the gene TGFB1 and acute respiratory distress syndrome.