| [B] Acaryochloris marina (strain MBIC 11017) | ACAM100410 | B0CB31 | Magnesium-protoporphyrin IX monomethyl ester aerobic oxidative cyclase |
| [B] Cyanothece (strain ATCC 51142) | CYAA504342 | B1WTP5 | Magnesium-protoporphyrin IX monomethyl ester aerobic oxidative cyclase |
| [B] Cyanothece sp. (strain PCC 7425 / ATCC 29141) | CYAP404421 | B8HM79 | Magnesium-protoporphyrin IX monomethyl ester aerobic oxidative cyclase |
| [B] Microcystis aeruginosa (strain NIES-843) | MICAN04343 | B0JUN6 | Magnesium-protoporphyrin IX monomethylester aerobic cyclization protein homolog |
| [B] Synechococcus sp. (strain ATCC 27264 / PCC 7002 / PR-6) | SYNP201960 | B1XHR0 | Putative magnesium-protoporphyrin IX monomethyl ester aerobic oxidative cyclase |
| [B] Synechocystis sp. (strain PCC 6803) | SYNY301624 | ACSF2_SYNY3 | Magnesium-protoporphyrin IX monomethyl ester [oxidative] cyclase 2 |
| [B] Thermosynechococcus elongatus (strain BP-1) | THEEB01693 | ACSF2_THEEB | Magnesium-protoporphyrin IX monomethyl ester [oxidative] cyclase 2 |
| [B] Anabaena sp. (strain PCC 7120) | ANASP01344 | ACSF1_ANASP | Magnesium-protoporphyrin IX monomethyl ester [oxidative] cyclase 1 |
| [B] Nostoc punctiforme (strain ATCC 29133 / PCC 73102) | NOSP701501 | B2J1G4 | Magnesium-protoporphyrin IX monomethyl ester aerobic oxidative cyclase |
| [B] Prochlorococcus marinus | PROMA00990 | ACSF_PROMA | PM: 10811605; di-iron enzyme Crd1 expression is activated in copper- or oxygen-deficient cells Mg-protoporphyrin IX monomethylester aerobic cyclization protein homolog |
| [B] Prochlorococcus marinus (strain MIT 9211) | PROM400919 | ACSF_PROM4 | Phytochrome-regulated gene |
| [B] Prochlorococcus marinus (strain MIT 9303) | PROM302880 | ACSF_PROM3 | Magnesium-protoporphyrin IX monomethyl ester (Oxidative) cyclase |
| [B] Prochlorococcus marinus (strain MIT 9313) | PROMM02186 | ACSF_PROMM | conserved hypothetical protein |
| [B] Prochlorococcus marinus (strain NATL1A) | PROM100884 | A2C1U2 | Magnesium-protoporphyrin IX monomethyl ester (Oxidative) cyclase |
| [B] Prochlorococcus marinus (strain NATL2A) | PROMT00836 | Q46LA9 | Magnesium-protoporphyrin IX monomethyl ester aerobic oxidative cyclase |