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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Halorubrum lacusprofundi (strain ATCC 49239 / DSM 5036 / JCM 8891 / ACAM 34) | HALLT2344 |  B9LSM0 | 7341 | (27) |
| [B] Acaryochloris marina (strain MBIC 11017) | ACAM12728 | B0CBB6 | 208198 | (15) |
| [B] Colwellia psychrerythraea (strain 34H / ATCC BAA-681) | COLP31982 |  HISX2_COLP3 | 208198 | (15) |
| [B] Verminephrobacter eiseniae (strain EF01-2) | VEREI204 | A1WEE3 | 208198 | (15) |
| [B] Rhodobacter sphaeroides (strain KD131 / KCTC 12085) | RHOSK451 | B9KNP8 | 208198 | (15) |
| [B] Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158) | RHOS4738 | HISX2_RHOS4 | 208198 | (15) |
| [B] Rhodobacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) | RHOS1803 | A3PHX4 | 208198 | (15) |
| [B] Ochrobactrum anthropi (strain ATCC 49188 / DSM 6882 / NCTC 12168) | OCHA43531 | A6X4Y3 | 208198 | (15) |
| [B] Rhizobium meliloti | RHIME5062 | HISX2_RHIME | 208198 | (15) |
| [B] Rhizobium loti | RHILO5570 | HISX3_RHILO | 208198 | (15) |
| [B] Sinorhizobium medicae (strain WSM419) | SINMW5982 | A6UMM7 | 208198 | (15) |