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Phylogeny of halophilic Archaea identified in an asphalt soil mixture from Pit 101 of the Rancho La Brea Tar Pits. Genera are indicated by vertical bars on the right of the tree, and values in parentheses are clone numbers. The robustness of the topology was estimated by bootstrap resampling of the neighbor-joining data. Bootstrap values greater than 75 are shown at branch points. Scale bar denotes 0.02 changes per nucleotide.
