Figure 3 of Shin, Mol Vis 2011; 17:3371-3378.

Figure 3. IL-6 levels measured by ELISA. The IL-6 levels decreased with an increase in the CYS concentration (p=0.003; Kruskal–Wallis test). PHA-stimulated PBMCs served as the positive control and unstimulated PBMCs served as the negative control. *: statistically significant by the Mann–Whitney U test.