Figure 5From: Phylogenetic analysis of Shiga toxin 1 and Shiga toxin 2 genes associated with disease outbreaksColor Coded Selecton Results for stx2 Sequences. Nonsynonymous:synonymous (dN:dS) ratios using the output from the Selecton program. Shades of yellow (1 and 2) indicate a dN:dS ratio of > 1 or positive selection. Any shade of bordeaux (4–7) indicates a dN:dS ratio of < 1 or purifying selection.Back to article page