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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Thermotoga lettingae (strain ATCC BAA-301 / DSM 14385 / TMO) | THELT935 |  A8F5S4 | 74717 | (3) |
| [A] Thermococcus onnurineus (strain NA1) | THEON1550 | B6YTU2 | 36358 | (10) |
| [A] Pyrococcus horikoshii | PYRHO624 | O58323 | 36358 | (10) |
| [A] Pyrococcus abyssi | PYRAB1446 | Q9UYQ8 | 74717 | (3) |
| [A] Pyrococcus furiosus | PYRFU315 | Q8U3Y3 | 36358 | (10) |
| [B] Thermoanaerobacter tengcongensis | THETN1406 | Q8R9Q3 | 74717 | (3) |
| [A] Thermococcus kodakaraensis | PYRKO2043 | Q5JDQ6 | 36358 | (10) |