Figure 3.Effect of psoralen on inflammatory genes IL-6, TNF-α and IL-1β in OA chondrocytes. E represents estrogen and I represents estrogen receptor antagonist. (A) Expression of IL-6 gene, (B) Expression of TNF-α gene, (C) Expression of IL-1β gene. ** represents P < 0.01, *** represents P < 0.001 compared to control group.
