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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Blochmannia pennsylvanicus (strain BPEN) | BLOPB242 |  Q493F1 | 215190 | (43) |
| [B] Candidatus Blochmannia floridanus | BLOFL238 |  SPEB_BLOFL | 215190 | (43) |
| [B] Methylobacterium nodulans (strain ORS2060 / LMG 21967) | METNO3687 | B8ISJ3 | 266249 | (2) |