Table 3.

Ranks of Adjacent Nucleotide Proportions

Type Observed proportion Proportion bias
−1 +1 −1 +1
SubstitutionA ≫ C ≈ T ≫ G[i] T ≫ G ≈ A ≫ CC > A > g > t[ii] G > T > c > a
TransitionA > C ≫ T ≫ GT > G ≫ A ≫ CC ≫ A > g > tG ≫ T > c > a
TransversionA > T ≫ G > CT > A ≫ C ≈ GA > G > c ≈ tT ≈ C ≈ g ≈ a
A/GC ≫ A > T ≫ GT ≫ A ≈ G > CC ≫ a > g > tT > G > c ≫ a
C/TA ≫ C ≈ T > GG ≫ T > A ≫ CA > C > g ≫ tG ≫ t > c > a
A/CA > C ≫ T > GA ≫ T ≈ C ≫ GC > A > g ≫ tA ≈ C ≫ t > g
G/TT ≫ A > G ≫ CT > G ≫ A > CG ≈ T ≫ a > cG ≫ T > c ≫ a
A/TA > T ≫ C > GT > A ≫ G > CA > C > t > gT > G > a > c
C/GA > T ≫ G > CT > A ≫ C > GA > G > t > cT > C ≈ a > g

[i] ≫ denotes greater than 5% difference between two nucleotide proportions, > 1%–5% difference, and ≈ less than 1% difference.

[ii] A lower-case letter denotes a negative bias of the observed nucleotide proportion compared with the genome average.