Additional file 8: Figure S7.

The relationship between the frequency of codon usage between adjacent codons (NT|A, NT|C, NT|G, NT|T, NC|A, NC|C, NC|G and NC|T) and intron number in the 11 test species. SC frequencies based on the third-next codon’s first nucleotide combinations were calculated.

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Qin et al. BMC Genomics 2013 14:56   doi:10.1186/1471-2164-14-56