Venn diagrams of common functionally conserved genes across all five vertebrate species. For each of the seven functional classes, the number of genes found in all combination of species intersections and exclusions are listed. (a) testis-specific, (b) ovary-specific, (c) gonadal-specific, (d) testis-expressed, (e) ovary-expressed, (f) gonadal-expressed, (g) non-reproductive.