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Phylogenetic tree of archaeal 16S rRNA gene sequences from the stratigraphic soil profile. The tree was constructed using the neighbor-joining method from a similarity matrix based on the distance determined by Kimura's two-parameter model. Bootstrap values (100 replications) generated using the maximum parsimony method. The phylotypes were named according to the soil depth origin. Numbers in brackets were GenBank accession numbers. The scale bar represents 5% estimated distance.
