FIGURE 1.
Phylogenetic relationship between Drosophila melanogaster opsins. The tree was constructed from a ClustalW alignment with bovine rhodopsin as an outgroup. Both neighbor joining and unweighted pair group methods were used. The trees were bootstrapped 1000 replications, and each node was supported 100% by both methods. The class of each pigment is indicated, referred to in Ref. 34. λmax corresponds to the maximal sensitivity of flies expressing each visual pigment in the R1–6 photoreceptor cells (17, 45, 46). The amino acid (AA) residue present at the site corresponding to bovine rhodopsin Ala-292 is indicated.