Figure 2.

Codon usage frequencies of N. apis (Blue) and N. ceranae (Green) gene groups. Each bar represents the proportion of all codons encoding a given amino-acid that are the specified codon. The values are one by definition for the single-codon amino acids, tryptophan (Trp) and methionine (Met). Both N. apis and N. ceranae share similar optimal codons.

Chen et al. BMC Genomics 2013 14:451   doi:10.1186/1471-2164-14-451
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