Fig. 5From: Lacking catalase, a protistan parasite draws on its photosynthetic ancestry to complete an antioxidant repertoire with ascorbate peroxidasePhylogeny of predicted APX proteins within the perkinsids and dinoflagellates. P. marinus APXs are distinct from all four dinoflagellate clades, and share a weakly supported group with Hematodinium sp. The tree shows representative core dinoflagellates that possess from one to four of the clades. The basal dinoflagellate Oxyrrhis contains only clade 4 APX form (inset table lower right). Organismal taxonomic relationships are drawn in the inset, upper leftBack to article page