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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Methylocella silvestris (strain BL2 / DSM 15510 / NCIMB 13906) | METSB1191 |  B8EPH2 | 68042 | (10) |
| [B] Beijerinckia indica subsp. indica (strain ATCC 9039 / DSM 1715 / NCIB 8712) | BEII9302 |  HIS8_BEII9 | 62223 | (51) |
| [B] Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2) | XANP2361 | HIS8_XANP2 | 62223 | (51) |
| [B] Azorhizobium caulinodans (strain ATCC 43989 / DSM 5975 / ORS 571) | AZOC54608 | HIS8_AZOC5 | 62223 | (51) |
| [B] Rhizobium leguminosarum bv. viciae (strain 3841) | RHIL34327 | Q1MB58 | 62223 | (51) |
| [B] Agrobacterium radiobacter (strain K84 / ATCC BAA-868) | AGRRK3169 | B9JBS1 | 62223 | (51) |
| [B] Agrobacterium tumefaciens (strain C58 / ATCC 33970) | AGRT53363 | HIS8_AGRT5 | 62223 | (51) |
| [B] Rhizobium etli (strain CFN 42 / ATCC 51251) | RHIEC3720 | Q2K3M8 | 62223 | (51) |
| [B] Rhizobium etli (strain CIAT 652) | RHIE64021 | B3PPD6 | 62223 | (51) |
| [B] Rhizobium leguminosarum bv. trifolii (strain WSM2304) | RHILW3536 | B5ZRX0 | 62223 | (51) |
| [B] Rhizobium meliloti | RHIME2632 | HIS81_RHIME | 62223 | (51) |