Fig. 2. Pd-pax6, Pd-six1/2, Pd-ath and Pd-opsin alignments. Alignment of protostome and deuterostome pax6 (A), six1/2 (B), atonal (C) and opsin (D) protein sequences. Conserved domains are indicated by a bar. Identical amino acids are indicated by a dot in the alignments, gaps are represented by ‘-’. Abbreviations: I to VII, conserved transmembrane domains in r-opsin; bHLH, basic helix loop helix; HD, homeodomain; PD, paired domain; SD, six domain.