Additional file 7: Figure S6.

The relationship between the frequency of codon usage within a codon (NAA, NCA, NGA, NTA, NAG, NCG, NGG and NGT) and intron number 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