Correspondence analysis of relative synonymous codon usage for Yersinia pestis genes:

	% variability Axis 1 12.1 Axis 2 7.9 Axis 3 5.3 Axis 4 4.4 Axis 5 3.7 Axis 6 3.5
Red (), blue () and green squares () correspond to genes proposed as being acquired by HGT and included in regions with a low, high and non-deviated G+C content, respectively. Yellow cross diagonals (x) correspond to putative highly expressed genes.
Correlation values between main axis in correspondence analysis and different parameters. See the Abbreviations used:   %G+C1 %G+C2 %G+C3 %G+CT Nc P2 X2 ICDI Axis 1 -0.6 -0.3 -0.6 -0.7 0.2 -0.5 0.2 0.1 Axis 2 -0.0 0.1 0.6 0.3 0.0 -0.2 -0.2 -0.3