|  | Human | Mouse | Rat | Mouse-Rat Ancestor |
---|---|---|---|---|---|
Genes | α | 7.15 × 10-4 | 4.90 × 10-4 | 7.28 × 10-4 | 8.02 × 10-4 |
 | β | 2.75 × 10-4 | 1.17 × 10-4 | 1.81 × 10-4 | 3.77 × 10-4 |
Pseudogenes | α | 1.84 × 10-3 | 1.20 × 10-3 | 1.94 × 10-3 | 2.06 × 10-3 |
 | β | 5.22 × 10-4 | 4.14 × 10-4 | 3.83 × 10-4 | 6.24 × 10-4 |