FIG. 1.

Phylogenetic tree of the proteobacteria and relatives from Monterey-sourced production fluids. 16S rDNA clones from this study are prefaced with O1. A neighbor-joining tree was generated from a mask of 607 nucleotide positions (Escherichia coli numbering 519 to 1,390) with Clostridium formicaceticum (X77836), Clostridium aminobutyricum (X76161), and Desulfotomaculum thermoandovorans (Z26315) serving as outgroups. Bootstrap values (n = 1,000 replicates) of ≥50 are reported as percentages. The scale bar represents the number of changes per nucleotide position.