Additional file 6.
Figure S2 - codon usage. (a) Principal component analysis of relative synonymous codon usage in Ich. (b) Effective number of codons (ENc; a measure of overall codon bias) for each predicted ORF is plotted versus GC3 (the fraction of codons that are synonymous at the third codon position that have either a guanine or a cytosine at that position). The upper limit of expected bias based on GC3 alone is represented by the red curve.
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Coyne et al. Genome Biology 2011 12:R100 doi:10.1186/gb-2011-12-10-r100