Phylogenetic tree displaying the two DmdB clades. The phylogenetic tree was constructed using the maximum likelihood method in MEGA 5.2. DmdBs investigated for this study are indicated (●). Nomenclature for DmdBs used in this study is as follows: BTHI2141, BTH_DmdB2; PA4198, PA_DmdB1; SAR11_0248, PU DmdB1; SL1157 1815, RL_DmdB1; SL1157 2728, RL_DmdB2; SPO0677, RPO_DmdB1; SPO2045, RPO_DmdB2.