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Maximum likelihood tree of a 542 bp of the ITS region from two Heterorhabditis isolates from Nam Nao National Park, Phetchabun Province, Thailand (codes ending with TH), together with 18 Heterorhabditis sequences downloaded from the GenBank database. Caenorhabditis elegans (accession no. JN636101.1) was used as the outgroup. Bootstrap values are based on 1,000 replicates.
