Table 1. Statistics of retrogenes and retrofamilies.
| Species | # of retrogenes | # of retrofamilies | # of retrogenes per family |
| Human | 163 (163) | 150 | 1.09 |
| Chimp | 199 (80∼139) | 187 | 1.07 |
| Macaca | 275 (110∼193) | 240 | 1.15 |
| Mouse | 154 (154) | 144 | 1.07 |
| Rat | 226 (170∼203) | 202 | 1.12 |
| Dog | 95 (71∼86) | 90 | 1.06 |
| Cow | 163 (122∼147) | 148 | 1.10 |
| Opossum | 232 (93∼162) | 220 | 1.05 |
| Chicken | 99 (40∼69) | 89 | 1.11 |
| Zebrafish | 140(105∼126) | 122 | 1.15 |
| Fruitfly | 212 (212) | 188 | 1.13 |
| Anopheles | 108 (43∼76) | 101 | 1.07 |
The criteria for refining retrogenes for functionality vary among species. The numbers in the parenthesis are the estimated numbers of functional retrogenes. See Text S1 for details.