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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Rhizobium etli (strain CFN 42 / ATCC 51251) | RHIEC3139 |  Q2K5B0 | 262706 | (21) |
| [B] Rhizobium leguminosarum bv. trifolii (strain WSM2304) | RHILW2918 | B5ZZI1 | 262828 | (3) |
| [B] Nostoc punctiforme (strain ATCC 29133 / PCC 73102) | NOSP71357 | B2IZQ1 | 262706 | (21) |
| [B] Anabaena variabilis (strain ATCC 29413 / PCC 7937) | ANAVT1349 | Q3MDD9 | 262706 | (21) |
| [B] Anabaena sp. (strain PCC 7120) | ANASP4399 | Q8YNW3 | 262706 | (21) |