Figure 2. Sal inhibits OGD/R-induced proinflammatory cytokine secretion. (A–D) Optical density analysis of the TNF-α, IL-1β and IL-6 proteins. (E–G) The mRNA expression levels of TNF-α, IL-1β and IL-6. Values are expressed as the mean ± SD. #p < 0.05, ##p < 0.01 vs. control; *p < 0.05, **p < 0.01 vs. OGD/R.