FIG. 2.

Phylogenetic tree of the low-G+C gram-positive division and related bacterial 16S rDNA clones (O1) and isolates (vp) from Monterey, Rincon, and Repetto-sourced production fluids. A neighbor-joining tree was generated from a mask of 609 nucleotide positions (E. coli numbering 519 to 1,390) with T. litoralis (Z70252) and M. thermoautotrophicum (X05482) 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.