Figure 3. Phylogenetic tree of the members of Methylobacterium whose genome sequences have been determined.

The amino-acid sequences of 36 broadly conserved proteins were concatenated and aligned with MUSCLE, from which a neighbor-joining tree was constructed using MEGA 5. Methylocella silvestris BL2 (CP001280) was used as the out-group. Colored circles indicate the kinds of proteins that are known to promote plant growth.