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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Thermoplasma volcanium | THEVO849 |  Q97AG1 | 302654 | (21) |
| [A] Thermoplasma acidophilum | THEAC619 | Q9HKH1 | 302654 | (21) |
| [A] Thermococcus onnurineus (strain NA1) | THEON1485 | B6YY05 | 302655 | (16) |
| [A] Thermococcus kodakaraensis | PYRKO1974 | Q5JIK0 | 302664 | (9) |
| [A] Pyrococcus furiosus | PYRFU957 |  VORA_PYRFU | 302664 | (9) |
| [A] Pyrococcus abyssi | PYRAB1363 | VORA_PYRAB | 302664 | (9) |
| [A] Pyrococcus horikoshii | PYRHO712 | VORA_PYRHO | 302664 | (9) |