FIG. 6.

Phylogenetic analysis of 16S rRNA sequences from the uncontaminated and benzene-oxidizing sites and from enrichment cultures. Phylogenetic trees were constructed by using maximum-parsimony methods with 100 bootstrapped data sets. Bootstrap values (of 100 trees) that are greater than 50 are shown adjacent to the nodes. A total of 402 base positions were considered in the analysis. The scale bar is in fixed nucleotide substitutions per 100 sequence positions. A similar tree topology was observed for trees constructed by using least-squares methods (data not shown).