Table II.
The statistical analysis of positive selection sites based on protein secondary structures of the R2 and R3 domains
The statistical significance of the positive selection counts on each of the helices was determined by a permutation test. *, Significance at 0.05 level; **, significance at 0.01 level.
| Category
|
No. of Sites
|
Count
|
Percentage
|
Count/Site
|
|||
|---|---|---|---|---|---|---|---|
| indica | japonica | indica | japonica | indica | japonica | ||
| % | |||||||
| Full R2R3 region | 104 | 252 | 789 | 100% | 100% | 2.4 | 7.6 |
| R2 domain | |||||||
| Helix1 | 15 | 62 | 137 | 25% | 17% | 4.1** | 9.1** |
| Helix2 | 7 | 49 | 128 | 19% | 16% | 7.0** | 18.3** |
| Helix3 | 10 | 9 | 13 | 4% | 2% | 0.9 | 1.3 |
| R3 domain | |||||||
| Helix1 | 14 | 76 | 289 | 30% | 37% | 5.4** | 20.6** |
| Helix2 | 6 | 23 | 87 | 9% | 11% | 3.8** | 14.5** |
| Helix3 | 10 | 7 | 11 | 3% | 1% | 0.7 | 1.1 |