MMP9 and central nervous system cancer: The result indicated that overexpressed CBX7 and downregulated CBX8 in glioma cells showed a decreased expression of MMP2 and MMP9 (Figures 6J,K;, Supplementary Figures S2B,C) and displayed significantly lower invasion abilities in scratch wound-healing assay when compared to the control (Figure 6L;, Supplementary Figure S2D).