Table 1.

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

Only copies identified as lineage-specific gene duplications by phylogenetic analysis are counted.