FIG. 2.

Unrooted neighbor-joining phylogenetic trees based on 16S rRNA sequences (A) and MnxG amino acid sequences (B). Mn(II)-oxidizing isolates from Guaymas Basin are indicated by boldface type and are designated “GB02-.” An asterisk indicates that multiple isolates were found to have identical 16S rRNA gene sequences (Table 1). Mn(II)-oxidizing isolates from coastal San Diego sediments are indicated by gray type. Additional Bacillus species, isolates, and clones are not thought to be capable of Mn(II) oxidation and are included for reference. Bootstrap values based on 1,000 replicates (>65%) are indicated at the branch points.