FIG. 4.

16S rRNA-based phylogenetic tree for Bdellovibrio isolates and previously published sequences. The tree was produced by using the neighbor-joining algorithm and sequence positions at which the residues in at least 50% of all available complete or almost complete 16S rRNA sequences from members of this subgroup were identical. The orders of branching were similar for all of the treeing approaches used (see Materials and Methods). Bar = estimated 10% sequence divergence. The bootstrap values at the nodes are percentages based on 100 iterations; only values greater than 50% are shown.