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Phylogenetic tree of the 21 slpH1 gene sequences based on the neighbor-joining method. The sequence alignment, distance matrix, and phylogenetic tree were calculated with Sequence Navigator software (version 1.0.1; Applied Biosystems). Groups I and II include sequences highly homologous to the published slpH1 (NCBI accession number X91199) and prt (NCBI accession number AB026985) gene sequences, respectively.
