Additional file 4: Figure S3.
The relationship between the SC frequency based on the third position and intron number 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