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The randomized axelerated maximum likelihood tree of Opisthorchis viverrini and other trematodes based on 377 nucleotide sequences of ITS2 gene. Schistosoma japonicum was selected as an outgroup. Bootstrap values higher than 50% are labeled over branches (1,000 replicates). Isolates in this report are underlined and shown in boldface, accession number: MK886660-MK886663. The collecting site of O. viverrini is in parenthesis. Scale bar indicates nucleotide substitutions per site.
