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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Methylobacterium populi (strain ATCC BAA-705 / NCIMB 13946 / BJ001) | METPB2732 |  B1ZDM3 | 8844 | (439) |
| [B] Methylobacterium chloromethanicum (strain CM4 / NCIMB 13688) | METC42746 | B7KQG6 | 8844 | (439) |
| [B] Methylobacterium extorquens (strain PA1) | METEP2620 | A9W650 | 8844 | (439) |
| [B] Methylobacterium sp. (strain 4-46) | METS41028 | B0UEA7 | 8844 | (439) |
| [B] Methylobacterium nodulans (strain ORS2060 / LMG 21967) | METNO657 | B8IF16 | 8844 | (439) |
| [B] Maricaulis maris (strain MCS10) | MARMM2040 | Q0AMZ9 | 8844 | (439) |
| [B] Actinobacillus succinogenes (strain ATCC 55618 / 130Z) | ACTSZ940 | A6VMX7 | 8844 | (439) |
| [B] Mannheimia succiniciproducens (strain MBEL55E) | MANSM760 | Q65UJ3 | 8844 | (439) |
| [B] Hyphomonas neptunium (strain ATCC 15444) | HYPNA2889 | Q0BY15 | 8844 | (439) |
| [B] Phenylobacterium zucineum (strain HLK1) | PHEZH784 | B4RG74 | 8844 | (439) |
| [B] Azorhizobium caulinodans (strain ATCC 43989 / DSM 5975 / ORS 571) | AZOC52558 | A8IAV3 | 8844 | (439) |
| [B] Caulobacter sp. (strain K31) | CAUSK3304 | B0T4W7 | 8844 | (439) |
| [B] Caulobacter crescentus | CAUCR2078 |  FUMC_CAUCR | 8844 | (439) |
| [B] Bradyrhizobium sp. (strain ORS278) | BRASO5267 | A4YZD0 | 8844 | (439) |
| [B] Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) | BRASB5693 | A5EPD9 | 8844 | (439) |
| [B] Jannaschia sp. (strain CCS1) | JANSC2386 | Q28PQ1 | 8844 | (439) |
| [B] Roseobacter denitrificans (strain ATCC 33942 / OCh 114) | ROSDO2113 | Q167I4 | 8844 | (439) |
| [B] Methylocella silvestris (strain BL2 / DSM 15510 / NCIMB 13906) | METSB276 | B8EP24 | 8844 | (439) |
| [B] Nitrobacter winogradskyi (strain Nb-255 / ATCC 25391) | NITWN2220 | Q3SQ34 | 8844 | (439) |
| [B] Bradyrhizobium japonicum | BRAJA6461 | FUMC1_BRAJA | 8844 | (439) |
| [B] Rhodopseudomonas palustris (strain BisB5) | RHOPS3337 | Q134A5 | 8844 | (439) |
| [B] Rhodopseudomonas palustris (strain BisA53) | RHOP52113 | Q07PP6 | 8844 | (439) |
| [B] Rhodopseudomonas palustris (strain BisB18) | RHOPB3214 | Q211X3 | 8844 | (439) |
| [B] Rhodopseudomonas palustris | RHOPA3487 | Q6N440 | 8844 | (439) |
| [B] Rhodopseudomonas palustris (strain TIE-1) | RHOPT3944 | B3QF06 | 8844 | (439) |
| [B] Rhodopseudomonas palustris (strain HaA2) | RHOP22025 | Q2IYH2 | 8865 | (48) |
| [B] Oligotropha carboxidovorans (strain ATCC 49405 / DSM 1227 / OM5) | OLICO1254 | B6JB65 | 8844 | (439) |
| [B] Rhizobium meliloti | RHIME1838 |  NP_385965.1 | 8844 | (439) |
| [B] Rhizobium loti | RHILO6400 | FUMC_RHILO | 8844 | (439) |
| [B] Sinorhizobium medicae (strain WSM419) | SINMW1541 | A6U9T7 | 8844 | (439) |
| [B] Agrobacterium tumefaciens (strain C58 / ATCC 33970) | AGRT51578 | FUMC_AGRT5 | 8844 | (439) |
| [B] Silicibacter pomeroyi | SILPO1864 | Q5LS64 | 8844 | (439) |
| [B] Silicibacter sp. (strain TM1040) | SILST1450 | Q1GGN1 | 8844 | (439) |
| [B] Dinoroseobacter shibae (strain DFL 12) | DINSH2305 | A8LRN9 | 8844 | (439) |
| [B] Paracoccus denitrificans (strain Pd 1222) | PARDP1835 | A1B3A9 | 8844 | (439) |
| [B] Rhodobacter sphaeroides (strain ATCC 17025 / ATH 2.4.3) | RHOS5705 | A4WQG3 | 8844 | (439) |
| [B] Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) | RHOS4721 | Q3J4J3 | 8844 | (439) |
| [B] Rhodobacter sphaeroides (strain KD131 / KCTC 12085) | RHOSK434 | B9KNN1 | 8844 | (439) |
| [B] Rhodobacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) | RHOS1786 | A3PHV7 | 8844 | (439) |
| [B] Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2) | XANP21607 | A7IFW9 | 8844 | (439) |
| [B] Parvibaculum lavamentivorans (strain DS-1 / DSM 13023 / NCIMB 13966) | PARL12376 | A7HVX1 | 8844 | (439) |
| [B] Nitrobacter hamburgensis (strain X14 / DSM 10229) | NITHX2572 | Q1QJT6 | 8844 | (439) |