Additional file 5: Figure S4.
The relationship between NNA/T : NNC/G ratio and exon position in the 11 test species. NNA/Ts: frequency of SCs having an A and a T in the third position of an amino acid, NNC/Gs: frequency of SCs having a C and a G in the third position of an amino acid. The mean is defined as the average of NNA/Ts to NNC/Gs ratios of 18 amino acids with SCs. 2EG, 3EG … indicates the number of exons present in the gene sequence (2, 3 …).
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Qin et al. BMC Genomics 2013 14:56 doi:10.1186/1471-2164-14-56