Fig. 4.

Phylogenetic affiliation of dinoflagellate rhodopsin with proton-pumping type proteorhodopsin. The gray arc denotes a clade of proton-pumping rhodopsin (xanthorhodopsin), and the dark arc indicates the dinoflagellate subclade, in which sequences from e-cDNAs are in gray shade. Bootstrap support of nodes leading to dinoflagellate-containing clades (arrow) was from maximum likelihood analysis. Taxa are shown by abbreviated species names followed by GenBank accession numbers. GU553957 for AP-cDNA3; GU554267 for AP_1061048708262.