Phylogenetic relationship of Strongyloides stercoralis Ss -RIOK-3 with homologs from 18 selected species of eukaryote. These species include six nematode species, two insects, two fish, two amphibians and five mammals. The RIOK-3 from Schizosaccharomyces pombe (CAA15723.2) is used as an outgroup. GenBank accession numbers of sequences are listed beside the species name. Bootstrap values are displayed above or below the branches.