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Acetobacter
Achromatium
Agrobacterium
Azotobacter
Beggiatoa
Beijereinckia
Bdellovibrio
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Brucella
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Campylobacter
Caulobacter
Coxiella
Chromatium
Chromobacterium
Chondromyces
Desulfobacter
Desulfovibrio
Desulfuromonas
Escherichia
Gallionella
Haemophilus
Helicobacter
Hyphomicrobium
Legionella
Leptothrix
Magnetospirillum
Methylococcus
Methylosinus
Mixococcus
Neisseria
Nitrobacter
Nitrosomonas
Photobacterium
Pseudomonas
Ralstonia
Rhizobium
Riquettsia
Rhodomicrobium
Rhodospirillum
Salmonella
Shigella
Sphaerotilus
Spirillum
Stigmatella
Thiobacillus
Thiospirillum
Thiothrix
Vibrio
Yersinia
Zooglea