Figure 3.

Exon and intron patterns of representative genes of metazoan β-hexosaminidases of GH20 family. Exon and intron patterns of representative genes of metazoan β-hexosaminidase of GH20 family, used in this study and drawn to scale relative to the number of nucleotides presenting each region (see additional file). Exons are represented with a rectangle, and homologous exons are depicted by a similar fill pattern. Gray filled rectangles represent non homologous exons in the ascidian C. intestinalis. Introns are depicted by a line between exons.