Relationship between Log Ratio and PTI. We plotted the average LR of genes with varying levels of % PTI from M-CGH experiments comparing two genome-sequenced strains of C. jejuni (NCTC 11168 vs. RM1221). Genes were binned according to PTI and the LR distributions of individual bins are presented here. The number of observations made within each PTI bin is shown in the lower axis. As seen in Figure 2, the average LR of genes with high levels of PTI are very similar, although a noticeable decrease in average LR is observed even at 98% PTI. Although the average LR becomes increasingly negative as PTI levels drop, given the SD observed within each group PTI category, there is considerable overlap between categories.