| [A] Methanosarcina barkeri (strain Fusaro / DSM 804) | METBF02380 | Q469P9 | probable hemolysin |
| [A] Methanosarcina mazei | METMA03204 | Q8PS13 | Conserved protein |
| [B] Chlorobaculum parvum (strain NCIB 8327) | CHLP801503 | B3QPS8 | Putative uncharacterized protein |
| [B] Chlorobium tepidum | CHLTE00533 | Q8KEZ1 | CBS domain protein |
| [B] Chlorobium limicola (strain DSM 245 / NBRC 103803) | CHLL202337 | B3EIE8 | Putative uncharacterized protein precursor |
| [B] Chlorobium phaeobacteroides (strain DSM 266) | CHLPD00084 | A1BCP1 | protein of unknown function DUF21 PFAM: CBS domain containing protein; protein of unknown function DUF21; transporter-associated region KEGG: plt:Plut_2077 CBS domain protein |
| [B] Prosthecochloris vibrioformis (strain DSM 265) | PROVI01696 | A4SGW9 | protein of unknown function DUF21 PFAM: CBS domain containing protein; protein of unknown function DUF21; transporter-associated region KEGG: plt:Plut_2077 CBS domain protein |
| [B] Pelodictyon luteolum (strain DSM 273) | PELLD02018 | Q3B162 | CBS domain protein |
| [B] Pelodictyon phaeoclathratiforme (strain DSM 5477 / BU-1) | PELPB02611 | B4SH04 | Putative uncharacterized protein |
| [B] Chloroflexus aurantiacus (strain ATCC 29364 / DSM 637 / Y-400-fl) | CHLSY04036 | B9LGB5 | Putative uncharacterized protein |
| [B] Chloroflexus aurantiacus (strain ATCC 29366 / DSM 635 / J-10-fl) | CHLAA03741 | A9WCP0 | Putative uncharacterized protein precursor |
| [B] Microcystis aeruginosa (strain NIES-843) | MICAN05428 | B0JI42 | Putative uncharacterized protein |
| [B] Synechococcus sp. (strain ATCC 27264 / PCC 7002 / PR-6) | SYNP200032 | B1XKT1 | Putative uncharacterized protein |
| [B] Synechocystis sp. (strain PCC 6803) | SYNY301910 | Y260_SYNY3 | UPF0053 protein sll0260 |
| [B] Caulobacter sp. (strain K31) | CAUSK00263 | B0T4A1 | Putative uncharacterized protein precursor |
| [B] Gluconacetobacter diazotrophicus (strain ATCC 49037 / DSM 5601 / PAl5) | GLUDA00696 | A9HAA8 | Putative uncharacterized protein |
| [B] Rhodospirillum centenum (strain ATCC 51521 / SW) | RHOCS02451 | B6IU27 | CBS domain protein |
| [B] Rhodospirillum rubrum (strain ATCC 11170 / NCIB 8255) | RHORT00753 | Q2RWD5 | conserved hypothetical protein |
| [B] Delftia acidovorans (strain DSM 14801 / SPH-1) | DELAS04138 | A9BLS0 | Putative uncharacterized protein |
| [B] Leptothrix cholodnii (strain ATCC 51168 / LMG 8142 / SP-6) | LEPCP03599 | B1Y4Z8 | Putative uncharacterized protein precursor |
| [B] Thiobacillus denitrificans (strain ATCC 25259) | THIDA02312 | Q3SGI4 | conserved hypothetical protein containing CBS domain |
| [B] Azoarcus sp. (strain EbN1) | AZOSE02284 | Q5P2J1 | CBS domain protein |
| [B] Vibrio splendidus (strain LGP32) | VIBSL00591 | B7VJX8 | Putative uncharacterized protein |