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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Granulobacter bethesdensis (strain ATCC BAA-1260 / CGDNIH1) | GRABC2069 |  Q0BQD3 | 199117 | (71) |
| [B] Bartonella henselae | BARHE1564 |  MDH_BARHE | 199117 | (71) |
| [B] Bartonella quintana | BARQU1288 | MDH_BARQU | 199117 | (71) |
| [B] Mesorhizobium sp. (strain BNC1) | MESSB3359 | MDH_MESSB | 199140 | (18) |
| [B] Paracoccus denitrificans (strain Pd 1222) | PARDP541 | A1AZH9 | 199133 | (89) |
| [B] Methylobacterium nodulans (strain ORS2060 / LMG 21967) | METNO1050 | MDH_METNO | 199117 | (71) |
| [B] Methylobacterium sp. (strain 4-46) | METS42018 | MDH_METS4 | 199117 | (71) |
| [B] Rhodospirillum rubrum (strain ATCC 11170 / NCIB 8255) | RHORT1204 | MDH_RHORT | 199133 | (89) |
| [B] Rhodospirillum centenum (strain ATCC 51521 / SW) | RHOCS3972 | MDH_RHOCS | 199117 | (71) |
| [B] Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) | RHOS42580 |  ABA80151.1 | 199133 | (89) |
| [B] Rhodobacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) | RHOS12591 | MDH_RHOS1 | 199133 | (89) |
| [B] Rhodobacter sphaeroides (strain KD131 / KCTC 12085) | RHOSK2338 | MDH_RHOSK | 199133 | (89) |
| [B] Magnetospirillum magneticum (strain AMB-1 / ATCC 700264) | MAGMM3903 | BAE52761.1 | 199133 | (89) |
| [B] Jannaschia sp. (strain CCS1) | JANSC816 | MDH_JANSC | 199133 | (89) |
| [B] Bartonella tribocorum (strain CIP 105476 / IBS 506) | BART11919 | MDH_BART1 | 199117 | (71) |