Significant higher expression of CYP4F3 (P < 0.0001) (Figure 6A), VEGF (P < 0.0001) (Figure 6B), MMP-9 (P < 0.001) (Figure 6C), IL-8 (P < 0.0001) (Figure 6D), and TLR2 (P < 0.0001) (Figure 6E) were noted in the periapical abscess compared with healthy controls. The gene discussed is TLR2; the disease is Tooth abscess.