Fig_S4.pdf

Variability of codon usage in proteobacteria. As an estimation of the variability in frequencies of codon usage in proteobacteria the difference between codon usages at percentiles 90 and 10 of the complete population was calculated. Data is presented in the context of the genetic code and values are colored with respect to variability, where the most variable codons are highlighted with blue colors and the least variable codons in red colors. A) Delta 90-10 of codon usages considering all genes of genomes. B) Delta 90-10 of codon usages considering a set of genes expected to be highly expressed.