TLR4 and acute respiratory distress syndrome: As shown in Figure 8a,b, compared with the control group, the protein levels of TLR4 and NF-κB in the LPS-induced ALI group were observably elevated (p < 0.01), but the elevations of TLR4 proteins in the positive, SSA-L, SSA-H, SSb1-H, SSb2-L, SSb2-H, and SSD-H groups were lowered, and the increases in NF-κB proteins in the positive, SSA-L, SSA-H, SSb1-L, SSb1-H, SSb2-L, SSb2-H, and SSD-H groups were reduced (p < 0.05 or p < 0.01).