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. 2012 Feb 10;7(2):e31150. doi: 10.1371/journal.pone.0031150

Figure 5. Correspondance analysis (CA) of codon usage in alvinellid polychaetes.

Figure 5

CA was performed using Codon W software from a series of 335 orthologous sequences between A. pompejana and P. grasslei. A: Distribution of codons for both species (red = A. pompejana and blue = P. grasslei) obtained from two independant runs and displayed in mirror (sign inversion) along axis 2 for greater clarity. The graph shows a clear separation of GC-terminated and AT-terminated codons along axis 1. B: Distribution of genes along the CA axis 1 according to their total GC content.