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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Methanococcus maripaludis (strain C7 / ATCC BAA-1331) | METM741 |  A6VF88 | 93850 | (13) |
| [B] Kineococcus radiotolerans (strain ATCC BAA-149 / DSM 14245 / SRS30216) | KINRD1053 | A6W6V6 | 93850 | (13) |
| [A] Thermoplasma volcanium | THEVO224 | Q97C79 | 93850 | (13) |
| [A] Picrophilus torridus | PICTO1343 | Q6KZC4 | 93850 | (13) |
| [B] Solibacter usitatus (strain Ellin6076) | SOLUE7263 | Q01PS3 | 111917 | (6) |
| [A] Thermoplasma acidophilum | THEAC151 | Q9HLS2 | 111917 | (6) |