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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Agrobacterium radiobacter (strain K84 / ATCC BAA-868) | AGRRK3270 |  B9JCF7 | 110751 | (5) |
| [B] Rhizobium meliloti | RHIME3023 |  OMP19_RHIME | 108422 | (17) |
| [B] Sinorhizobium medicae (strain WSM419) | SINMW2891 | A6UDP5 | 108422 | (17) |
| [B] Agrobacterium tumefaciens (strain C58 / ATCC 33970) | AGRT52566 | OMP19_AGRT5 | 108422 | (17) |
| [B] Rhizobium etli (strain CIAT 652) | RHIE64115 | B3PQ93 | 110751 | (5) |
| [B] Rhizobium etli (strain CFN 42 / ATCC 51251) | RHIEC3802 | Q2K3E7 | 110751 | (5) |
| [B] Rhizobium leguminosarum bv. trifolii (strain WSM2304) | RHILW3639 | B5ZSS2 | 110751 | (5) |
| [B] Rhizobium leguminosarum bv. viciae (strain 3841) | RHIL34428 | Q1MAV8 | 110751 | (5) |