FIG. 1.

Phylogenetic tree based on the neighbor-joining method for partial 16S rRNA gene sequences showing the relationship of CO-oxidizing isolates (with a “JT-” prefix) to select cultured and environmental sequences. Labels depicted in bold are CO-oxidizing isolates and type cultures or organisms that have been previously implicated in environmental CO oxidation. Bootstrap values above 50% are shown at the nodes. Sequence accession numbers and culture sources or references follow parenthetically. Bar, 10% estimated change per nucleotide.