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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Archaeoglobus fulgidus | ARCFU38 |  O30197 | 111644 | (13) |
| [A] Methanosarcina mazei | METMA2175 | Q8PUV6 | 89328 | (5) |
| [A] Methanosarcina acetivorans | METAC1136 | Q8TRI9 | 111644 | (13) |
| [A] Methanobacterium thermoautotrophicum | METTH328 | O26432 | 111644 | (13) |
| [A] Methanosarcina barkeri (strain Fusaro / DSM 804) | METBF1842 | Q46B90 | 89328 | (5) |
| [A] Uncultured methanogenic archaeon RC-I | UNCMA2489 | Q0W7G6 | 111644 | (13) |