Figure 2From: Quantification of codon selection for comparative bacterial genomicsDistribution of ACE z values for orthologs of Escherichia coli and Buchnera aphidicola. ACE z values were calculated using the Translation40 gene set to construct f o and all ORFs to construct f n . A. All genes from E. coli (4144 ORFs) and B. aphidicola (564 ORFs). B. Putative orthologs (499 ORFs) shared between E. coli and B. aphidicola.Back to article page