Fig. 8
Arterial blood gas was measured at 1, 3, 7, 14, and 28 days after treatment. Data are presented as the mean ± SD. *P < 0.05, **P < 0.01, vs. at 1 day after human amnion-derived mesenchymal stem cell (hAMSC) treatment; #P < 0.05, ###P < 0.001, vs. model group; &P < 0.05, &&&P < 0.001, phosphate-buffered saline (PBS) group. FiO2, fraction of inspired oxygen; PaCO2, partial pressure of carbon dioxide; PaO2, partial pressure of oxygen