Differential gene expression in P. gingivalis W83 by polyP75 treatment. Differentially expressed genes with 1.5 fold change and P-value < 0.05 were plotted. X-axis presents fold difference between log2 expression of polyP75 treatment and no treatment, and y-axis shows the –log10
P -value. Up-regulated genes (over-expressed in polyP75 treatment) were represented as red color and down-regulated genes were colored in blue.