Additional file 6: Figure S5.
The relationship between the frequency of codon usage (NNA, NNC, NNG and NNT) and exon position in the 11 test species. NNA, NNT, NNC and NNG are defined as the ratio of total SCs with A, T, C and G at the third position, respectively to 59 SCs.
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Qin et al. BMC Genomics 2013 14:56 doi:10.1186/1471-2164-14-56