FIG. 4.

Phylogenetic tree based on the translated (α subunit) amino acid sequences of PCR-amplified dsrAB genes from CARN-A and CARN-B with selected sequences recovered from other different environmental sources and formally described species. The tree was inferred using the neighbor-joining method, and evolutionary distances were computed using the Poisson correction method. There were a total of 224 positions in the final data set. The scale bar corresponds to 0.05 substitution per site. Percentages of 100 bootstrap resamplings that supported the branching orders in each analysis are shown above or near the relevant nodes. Bootstrap values are shown for branches with more than 50% bootstrap support. The relative abundance of each RFLP pattern is indicated in brackets.