Gene set | Number of sequences |
d
N
|
d
S
| d
N
/d
S
ratio |
---|
 | Included | Excluded | Mean | Std. Dev. | Mean | Std. Dev. | Mean | Std. Dev. |
---|
Ta1 | 518 | 299 | 0.05 | 0.04 | 0.69 | 0.15 | 0.07 | 0.05 |
Ta2 | 159 | 83 | 0.06 | 0.04 | 0.70 | 0.15 | 0.09 | 0.05 |
Ta3 | 227 | 119 | 0.08 | 0.04 | 0.71 | 0.14 | 0.11 | 0.06 |
Ta4 | 107 | 68 | 0.09 | 0.05 | 0.71 | 0.15 | 0.13 | 0.06 |
Ta5 | 687 | 593 | 0.13 | 0.07 | 0.73 | 0.14 | 0.19 | 0.10 |
- Genes that are not single-copy or have a high level of divergence (i.e., d
S
> 1) are excluded because the substitution rate estimates are not reliable. Level 6 genes are not included because they are species-specific and have no orthologous sequence for comparison. The nonsynonymous substitution rate (d
N
) indicates the number of nonsynonymous substitutions per nonsynonymous site; the synonymous substitution rate (d
S
) indicates the number of synonymous substitutions per synonymous site.