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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Campylobacter hominis (strain ATCC BAA-381 / LMG 19568 / NCTC 13146 / CH001A) | CAMHC1160 |  A7I2P1 | 302761 | (18) |
| [B] Coprothermobacter proteolyticus (strain ATCC 35245 / DSM 5265 / BT) | COPPD1336 | B5Y630 | 302761 | (18) |
| [B] Dictyoglomus thermophilum (strain ATCC 35947 / DSM 3960 / H-6-12) | DICT61723 | B5YB85 | 302761 | (18) |
| [B] Thermosipho melanesiensis (strain BI429 / DSM 12029) | THEM4297 | A6LJS8 | 302761 | (18) |
| [B] Clostridium thermocellum (strain ATCC 27405 / DSM 1237) | CLOTH1461 | A3DFL1 | 302761 | (18) |
| [A] Methanosphaera stadtmanae (strain DSM 3091) | METST140 | Q2NHS1 | 302761 | (18) |
| [B] Rhodococcus erythropolis (strain PR4 / NBRC 100887) | RHOE42431 | C0ZXR0 | 27116 | (22) |
| [B] Acholeplasma laidlawii (strain PG-8A) | ACHLI1048 | A9NH62 | 302761 | (18) |