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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Rhodopseudomonas palustris | RHOPA2649 |  Q6N6G0 | 265189 | (17) |
| [B] Rhodopseudomonas palustris (strain TIE-1) | RHOPT2873 | B3QIT5 | 265189 | (17) |
| [B] Rhodopseudomonas palustris (strain HaA2) | RHOP22846 | Q2IW50 | 265189 | (17) |
| [B] Bradyrhizobium japonicum | BRAJA4560 | Q89LD3 | 265189 | (17) |
| [B] Rhodopseudomonas palustris (strain BisB5) | RHOPS2597 | Q136Z6 | 265189 | (17) |
| [B] Bradyrhizobium sp. (strain ORS278) | BRASO3542 | A4YUF1 | 265189 | (17) |
| [B] Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) | BRASB3894 | A5EJ88 | 265189 | (17) |
| [B] Nitrobacter winogradskyi (strain Nb-255 / ATCC 25391) | NITWN1691 | Q3SRP3 | 265189 | (17) |
| [B] Nitrobacter hamburgensis (strain X14 / DSM 10229) | NITHX1671 | Q1QMF2 | 265189 | (17) |
| [B] Rhodopseudomonas palustris (strain BisB18) | RHOPB2560 | Q214N4 | 265189 | (17) |
| [B] Rhodopseudomonas palustris (strain BisA53) | RHOP52739 | Q07MW5 | 265189 | (17) |
| [E] Taeniopygia guttata | TAEGU431 |  ENSTGUP00000010330 | 27704 | (27) |