Additional file 9: Figure S8.
The relationship between the frequency of codon usage (NAA, NCA, NGA, NTA, NAG, NCG, NGG AND NTG) and exon position in the 11 test species. SC frequencies based on the second-third nucleotide combinations were calculated.
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Qin et al. BMC Genomics 2013 14:56 doi:10.1186/1471-2164-14-56