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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Mesorhizobium sp. (strain BNC1) | MESSB940 |  ACPS_MESSB | 5733 | (151) |
| [B] Agrobacterium tumefaciens (strain C58 / ATCC 33970) | AGRT51013 | ACPS_AGRT5 | 5733 | (151) |
| [B] Rhizobium meliloti | RHIME1057 | ACPS_RHIME | 5733 | (151) |
| [B] Sinorhizobium medicae (strain WSM419) | SINMW674 | ACPS_SINMW | 5733 | (151) |
| [B] Rhodospirillum centenum (strain ATCC 51521 / SW) | RHOCS1444 | ACPS_RHOCS | 5733 | (151) |
| [B] Rhodopseudomonas palustris (strain BisB5) | RHOPS2632 | ACPS_RHOPS | 5733 | (151) |
| [B] Rhodopseudomonas palustris (strain BisB18) | RHOPB2596 | ACPS_RHOPB | 5733 | (151) |
| [B] Bradyrhizobium sp. (strain ORS278) | BRASO4220 |  A4YWD0 | 5733 | (151) |
| [B] Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) | BRASB4375 | ACPS_BRASB | 5733 | (151) |
| [B] Rhodopseudomonas palustris (strain BisA53) | RHOP52980 | ACPS_RHOP5 | 5733 | (151) |
| [B] Bradyrhizobium japonicum | BRAJA5007 | ACPS_BRAJA | 5733 | (151) |
| [B] Oligotropha carboxidovorans (strain ATCC 49405 / DSM 1227 / OM5) | OLICO1812 | ACPS_OLICO | 5733 | (151) |
| [B] Rhodopseudomonas palustris | RHOPA2687 | ACPS_RHOPA | 5733 | (151) |
| [B] Rhodopseudomonas palustris (strain TIE-1) | RHOPT2913 | ACPS_RHOPT | 5733 | (151) |
| [B] Rhizobium loti | RHILO6089 | ACPS_RHILO | 5733 | (151) |
| [B] Methylocella silvestris (strain BL2 / DSM 15510 / NCIMB 13906) | METSB976 | ACPS_METSB | 5749 | (8) |
| [B] Beijerinckia indica subsp. indica (strain ATCC 9039 / DSM 1715 / NCIB 8712) | BEII92386 | ACPS_BEII9 | 5733 | (151) |
| [B] Caulobacter sp. (strain K31) | CAUSK1693 | ACPS_CAUSK | 5733 | (151) |
| [B] Agrobacterium radiobacter (strain K84 / ATCC BAA-868) | AGRRK1190 | ACPS_AGRRK | 5733 | (151) |
| [B] Rhizobium etli (strain CFN 42 / ATCC 51251) | RHIEC1354 | ACPS_RHIEC | 5733 | (151) |
| [B] Rhizobium leguminosarum bv. trifolii (strain WSM2304) | RHILW983 | ACPS_RHILW | 5733 | (151) |
| [B] Rhizobium etli (strain CIAT 652) | RHIE61436 | ACPS_RHIE6 | 5733 | (151) |
| [B] Azorhizobium caulinodans (strain ATCC 43989 / DSM 5975 / ORS 571) | AZOC51995 | ACPS_AZOC5 | 5733 | (151) |
| [B] Caulobacter crescentus | CAUCR1536 | ACPS_CAUCR | 5733 | (151) |