Figure 3

APX protein alignment for different Symbiodinium ITS2 types. Annotations indicate functionally important residues involved in binding of heme (red), ascorbate (blue) and cations (proximal [orange] and distal [ochre]). Binding sites for hydrogen peroxide (cyan) and residues involved in the formation of the catalytic site (green) are highlighted. Annotations were deduced from alignments with characterized chlorophyte, bryophyte, lycophyte, and higher plant sequences [56]. Ends of ORFs are indicated by asterisks. Sequence IDs consist of ITS2 type, strain designation or source of isolation (in brackets), APX isoform and GenBank accession number or contig/assembly designation (Additional file 11). Shading for sequence similarity is identical to that of Figure 1.