Fig. 2. Swarming abilities of transformants. Fresh colonies were inoculated in 0.3% agar VPG plates containing 100 µg/ml kanamycin and incubated at 30°C for 5 h. The pomAB mutant (NMB191) was used as the host strain. Proteins expressed in each strain, various combinations of A and B subunits of the proton-driven or sodium-driven motors (A), each MomB protein with proton-type MotA (B) and each MomB protein with sodium-type PomA (C), are noted around swarms.