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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Methylobacterium radiotolerans (strain ATCC 27329 / DSM 1819 / JCM 2831) | METRJ4234 |  B1M3D9 | 195139 | (79) |
| [B] Methylobacterium chloromethanicum (strain CM4 / NCIMB 13688) | METC42671 | B7KPR9 | 195139 | (79) |
| [B] Methylobacterium extorquens (strain PA1) | METEP2549 | A9W5X9 | 195139 | (79) |
| [B] Methylobacterium populi (strain ATCC BAA-705 / NCIMB 13946 / BJ001) | METPB2569 | B1ZC85 | 195139 | (79) |
| [B] Methylobacterium nodulans (strain ORS2060 / LMG 21967) | METNO6795 | B8ILM4 | 195139 | (79) |
| [B] Methylobacterium sp. (strain 4-46) | METS45670 | B0UKG9 | 195139 | (79) |
| [B] Rhodobacter sphaeroides (strain KD131 / KCTC 12085) | RHOSK3043 | B9KS98 | 195139 | (79) |
| [B] Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) | RHOS4245 |  ISPH_RHOS4 | 195139 | (79) |
| [B] Rhodobacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) | RHOS1295 | ISPH_RHOS1 | 195139 | (79) |
| [B] Silicibacter pomeroyi | SILPO3124 | ISPH_SILPO | 195139 | (79) |
| [B] Paracoccus denitrificans (strain Pd 1222) | PARDP3509 | ISPH_PARDP | 195139 | (79) |
| [B] Dinoroseobacter shibae (strain DFL 12) | DINSH188 | ISPH_DINSH | 195139 | (79) |
| [B] Beijerinckia indica subsp. indica (strain ATCC 9039 / DSM 1715 / NCIB 8712) | BEII91864 | ISPH_BEII9 | 195143 | (34) |
| [B] Methylocella silvestris (strain BL2 / DSM 15510 / NCIMB 13906) | METSB3145 | ISPH_METSB | 195147 | (4) |
| [B] Silicibacter sp. (strain TM1040) | SILST2559 | ISPH_SILST | 195139 | (79) |
| [B] Rhodobacter sphaeroides (strain ATCC 17025 / ATH 2.4.3) | RHOS52463 | ISPH_RHOS5 | 195139 | (79) |
| [B] Hyphomonas neptunium (strain ATCC 15444) | HYPNA2654 | ISPH_HYPNA | 195139 | (79) |
| [B] Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2) | XANP22284 | A7IHV5 | 195143 | (34) |
| [B] Jannaschia sp. (strain CCS1) | JANSC506 | Q28V38 | 195139 | (79) |
| [B] Pelagibacter ubique | PELUB123 | Q4FPE1 | 195139 | (79) |
| [B] Roseobacter denitrificans (strain ATCC 33942 / OCh 114) | ROSDO1256 | ISPH_ROSDO | 195139 | (79) |
| [B] Azorhizobium caulinodans (strain ATCC 43989 / DSM 5975 / ORS 571) | AZOC51462 | A8HX72 | 195139 | (79) |