Phylogenetic tree of Crybb and Crybb-like proteins in vertebrates. A neighbor-joining tree based on the alignment of vertebrates Crybb and Crybb-like sequences was built. Species are indicated as Sse (Solea senegalensis), Sso (Solea solea) Dre (Danio rerio), Tni (Tetraodon nigroviridis), Oni (Oreochromis niloticus), Ola (Oryzia slatipes), Cse (Cynoglossus semilaevis), Xla (Xenopus laevis) and Gga (Gallus gallus; see Additional file 7 for accession numbers). Solea sequences are indicated according to the transcript name assigned in SoleaDB. Clusters are indicated as arcs of a circle. The tree obtained was rooted using Xenopus laevis Cryga. Numbers adjacent to nodes indicate percentage bootstrap support; only values larger than 70% (over 1,000 replicates) are shown.