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Phylogenetic tree of 16S rRNA gene sequences of arsenite resistant isolates from soil and close relative reference isolates retrieved from database with accession numbers. The tree was generated in program MEGA 5 using the neighbour-joining algorithm with the Methanosarcina sp. sequence serving as out-group. Bootstrap values (n = 1000 replicates) are shown at branch nodes and the scale bar represents the number of changes per nucleotide position
