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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) | BRASB4113 |  SURE_BRASB | 228981 | (42) |
| [B] Bradyrhizobium sp. (strain ORS278) | BRASO3809 | SURE_BRASO | 228981 | (42) |
| [B] Nitrobacter winogradskyi (strain Nb-255 / ATCC 25391) | NITWN1679 | SURE_NITWN | 228981 | (42) |
| [B] Nitrobacter hamburgensis (strain X14 / DSM 10229) | NITHX1682 | SURE_NITHX | 228981 | (42) |
| [B] Rhodopseudomonas palustris (strain BisB5) | RHOPS2766 | SURE_RHOPS | 228980 | (25) |
| [B] Rhodopseudomonas palustris (strain BisB18) | RHOPB2478 | SURE_RHOPB | 228981 | (42) |
| [B] Rhodopseudomonas palustris (strain HaA2) | RHOP22727 | SURE_RHOP2 | 228980 | (25) |
| [B] Rhodopseudomonas palustris (strain BisA53) | RHOP52660 | SURE_RHOP5 | 228981 | (42) |
| [B] Methylobacterium radiotolerans (strain ATCC 27329 / DSM 1819 / JCM 2831) | METRJ2242 | SURE_METRJ | 228981 | (42) |
| [B] Methylobacterium sp. (strain 4-46) | METS46200 | SURE_METS4 | 228980 | (25) |
| [B] Methylobacterium nodulans (strain ORS2060 / LMG 21967) | METNO6930 | SURE_METNO | 228981 | (42) |
| [B] Methylobacterium populi (strain ATCC BAA-705 / NCIMB 13946 / BJ001) | METPB4617 | SURE_METPB | 228980 | (25) |
| [B] Methylobacterium extorquens (strain PA1) | METEP4166 | SURE_METEP | 228980 | (25) |
| [B] Methylobacterium chloromethanicum (strain CM4 / NCIMB 13688) | METC44389 | SURE_METC4 | 228980 | (25) |