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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Acidiphilium cryptum (strain JF-5) | ACICJ79 |  PQQC_ACICJ | 267426 | (42) |
| [B] Cupriavidus taiwanensis (strain R1 / LMG 19424) | CUPTR3567 |  B2AIN6 | 267426 | (42) |
| [B] Methylocella silvestris (strain BL2 / DSM 15510 / NCIMB 13906) | METSB1698 | B8EKE5 | 267426 | (42) |
| [B] Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2) | XANP21740 | A7IGA3 | 267426 | (42) |
| [B] Granulobacter bethesdensis (strain ATCC BAA-1260 / CGDNIH1) | GRABC1926 | PQQC_GRABC | 267426 | (42) |
| [B] Beijerinckia indica subsp. indica (strain ATCC 9039 / DSM 1715 / NCIB 8712) | BEII93211 | B2IDU8 | 267445 | (3) |
| [B] Methylobacterium populi (strain ATCC BAA-705 / NCIMB 13946 / BJ001) | METPB1726 | B1ZIB3 | 267426 | (42) |
| [B] Methylobacterium extorquens (strain PA1) | METEP1782 | A9W3R1 | 267426 | (42) |
| [B] Methylobacterium chloromethanicum (strain CM4 / NCIMB 13688) | METC42019 | B7KXC7 | 267426 | (42) |
| [B] Methylobacterium nodulans (strain ORS2060 / LMG 21967) | METNO5643 | B8ITV9 | 267426 | (42) |
| [B] Methylobacterium radiotolerans (strain ATCC 27329 / DSM 1819 / JCM 2831) | METRJ497 | B1LUE8 | 267426 | (42) |
| [B] Methylobacterium sp. (strain 4-46) | METS45422 | B0UE11 | 267426 | (42) |
| [B] Gluconobacter oxydans | GLUOX947 | PQQC_GLUOX | 267426 | (42) |
| [B] Rhodopseudomonas palustris (strain BisB18) | RHOPB869 | Q21AY5 | 267426 | (42) |
| [B] Rhodobacter sphaeroides (strain ATCC 17025 / ATH 2.4.3) | RHOS5375 | PQQC_RHOS5 | 267426 | (42) |
| [B] Rhodobacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) | RHOS12411 | PQQC_RHOS1 | 267426 | (42) |
| [B] Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) | RHOS42398 | PQQC_RHOS4 | 267426 | (42) |
| [B] Rhodobacter sphaeroides (strain KD131 / KCTC 12085) | RHOSK2132 | PQQC_RHOSK | 267426 | (42) |
| [B] Methylocella silvestris (strain BL2 / DSM 15510 / NCIMB 13906) | METSB1132 | B8ENI7 | 267445 | (3) |
| [B] Chromohalobacter salexigens (strain DSM 3043 / ATCC BAA-138 / NCIMB 13768) | CHRSD838 | Q1QZA5 | 267426 | (42) |
| [B] Gluconacetobacter diazotrophicus (strain ATCC 49037 / DSM 5601 / PAl5) | GLUDA1226 | A9HEC1 | 267445 | (3) |
| [B] Rhodopseudomonas palustris (strain TIE-1) | RHOPT2115 | PQQC_RHOPT | 267426 | (42) |
| [B] Rhodopseudomonas palustris | RHOPA1940 | PQQC_RHOPA | 267426 | (42) |
| [B] Rhodopseudomonas palustris (strain BisA53) | RHOP5836 | Q07TD3 | 267426 | (42) |
| [B] Bradyrhizobium japonicum | BRAJA6678 | PQQC_BRAJA | 267426 | (42) |
| [B] Rhodopseudomonas palustris (strain BisB5) | RHOPS2022 | Q139H3 | 267426 | (42) |
| [B] Rhodopseudomonas palustris (strain HaA2) | RHOP23403 | Q2IUJ3 | 267426 | (42) |
| [B] Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) | BRASB5880 | A5EPX6 | 267426 | (42) |
| [B] Bradyrhizobium sp. (strain ORS278) | BRASO5472 | PQQC_BRASO | 267426 | (42) |