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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Silicibacter pomeroyi | SILPO540 |  Q5LVZ0 | 56028 | (13) |
| [B] Rhizobium leguminosarum bv. viciae (strain 3841) | RHIL35562 | Q1M6Y8 | 56028 | (13) |
| [B] Rhizobium etli (strain CFN 42 / ATCC 51251) | RHIEC4643 | Q2K032 | 56028 | (13) |
| [B] Rhizobium leguminosarum bv. trifolii (strain WSM2304) | RHILW5831 | B6A412 | 63916 | (16) |
| [B] Roseobacter denitrificans (strain ATCC 33942 / OCh 114) | ROSDO1013 | Q16B92 | 56028 | (13) |
| [B] Agrobacterium radiobacter (strain K84 / ATCC BAA-868) | AGRRK5700 | B9JKV9 | 56028 | (13) |
| [B] Rhizobium etli (strain CIAT 652) | RHIE65383 | B3Q129 | 63916 | (16) |
| [B] Silicibacter sp. (strain TM1040) | SILST3665 | Q1GL10 | 56028 | (13) |