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Phylogenetic tree of the Blastocystis sp. isolates and reference SSU rRNA gene sequences from GenBank based on maximum likelihood analysis. The tree was rooted on Karotomorpha sp. and Protoopalina intestinalis. Bootstrap values > 50% from 1,000 replicates are shown on the nodes. Reference sequences from GenBank have accession number and host designation. The isolates of seven subtypes, with their host designations, are indicated by triangle shape.
