OLFM4 and acute respiratory distress syndrome: OLFM4 expression was significantly increased in the ALI group (1.39 ± 0.10) compared with the control group (0.36 ± 0.13), and it was decreased in the QBH-treated groups (3.0 mL/kg, 0.98 ± 0.18; 6.0 mL/kg, 0.67 ± 0.22) compared with the ALI group (Figure 5(b)).