Distribution of Orthologous Genes between Zebrafish and Mouse
| No. of copies in Zebrafish | No. of Copies in Mouse | No. of Gene Families |
| 1 | 1 | 153 |
| 1 | 2 or more | 11 |
| 2 or more | 1 | 26 |
| 2 | 2 | 1 |
| Total | 191 |
[i] Only copies identified as lineage-specific gene duplications by phylogenetic analysis are counted.