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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Sinorhizobium medicae (strain WSM419) | SINMW3281 |  ADD_SINMW | 224379 | (21) |
| [B] Rhizobium meliloti | RHIME130 | ADD_RHIME | 224395 | (7) |
| [B] Rhizobium leguminosarum bv. trifolii (strain WSM2304) | RHILW4130 | ADD_RHILW | 224379 | (21) |
| [B] Rhizobium etli (strain CIAT 652) | RHIE6234 | ADD_RHIE6 | 224379 | (21) |
| [B] Rhizobium etli (strain CFN 42 / ATCC 51251) | RHIEC189 | ADD_RHIEC | 224379 | (21) |
| [B] Rhizobium leguminosarum bv. viciae (strain 3841) | RHIL3206 | ADD_RHIL3 | 224379 | (21) |
| [B] Agrobacterium radiobacter (strain K84 / ATCC BAA-868) | AGRRK261 | ADD_AGRRK | 224379 | (21) |
| [B] Paracoccus denitrificans (strain Pd 1222) | PARDP2142 |  A1B468 | 224379 | (21) |
| [B] Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) | RHOS4173 | Q3J643 | 224390 | (12) |
| [B] Rhodobacter sphaeroides (strain KD131 / KCTC 12085) | RHOSK2975 | B9KS29 | 224390 | (12) |
| [B] Rhodobacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) | RHOS1249 | A3PGA3 | 224390 | (12) |
| [B] Silicibacter pomeroyi | SILPO2855 | Q5LPC1 | 224379 | (21) |
| [B] Dinoroseobacter shibae (strain DFL 12) | DINSH821 | A8LRC5 | 224390 | (12) |
| [B] Rhodobacter sphaeroides (strain ATCC 17025 / ATH 2.4.3) | RHOS5270 | A4WP74 | 224390 | (12) |