TGFB1 and acute respiratory distress syndrome: Moreover, the Th17/Treg ratio in the LPS + mBM-MSC and LPS + mBM-MSC-NC groups was significantly lower than that in the ARDS group (p < 0.05), and that in the LPS + mBM-MSC-TGFβ1 group was even lower than that in the LPS + mBM-MSC-NC group (p < 0.05, Fig. 4d).