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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Fervidobacterium nodosum (strain ATCC 35602 / DSM 5306 / Rt17-B1) | FERNB776 |  A7HL81 | 218918 | (5) |
| [B] Thermosipho africanus (strain TCF52B) | THEAB1227 | B7ICK8 | 218907 | (20) |
| [B] Thermosipho melanesiensis (strain BI429 / DSM 12029) | THEM4989 | A6LLS1 | 218918 | (5) |
| [B] Thermotoga lettingae (strain ATCC BAA-301 / DSM 14385 / TMO) | THELT114 | A8F3F3 | 218907 | (20) |