Partial Phylogenetic relationships among nucleotide sequences of Blastocystis sp. partial small subunit ribosomal RNA (SSU rRNA) genes. The neighbor-joining method was used to construct the trees by the Kimura-2-parameter model. The numbers on the branches are percent bootstrap support values from 1000 replicates; only values of more than 50% are shown on the tree. Each sequence is identified by its accession number, subtype, host origin, and country. Sequences marked with black triangles are representative sequences identified in this study.