| [A] Desulfurococcus kamchatkensis (strain 1221n / DSM 18924) | DESK101145 | KCY_DESK1 | Cytidylate kinase |
| [A] Ignicoccus hospitalis (strain KIN4/I / DSM 18386 / JCM 14125) | IGNH400754 | KCY_IGNH4 | Cytidylate kinase, putative |
| [A] Staphylothermus marinus (strain ATCC 43588 / DSM 3639 / F1) | STAMF01029 | KCY_STAMF | Cytidylate kinase, putative |
| [A] Hyperthermus butylicus (strain DSM 5456 / JCM 9403) | HYPBU01276 | A2BME6 | Cytidylate kinase |
| [A] Metallosphaera sedula (strain ATCC 51363 / DSM 5348) | METS500118 | A4YCZ3 | Cytidylate kinase, putative |
| [A] Sulfolobus acidocaldarius | SULAC00530 | KCY_SULAC | N-terminal similar to sp:P38493 Cytidylate kinase (EC 2.7.4.14) (CK) (Cytidinemonophosphate kinase)(CMPkinase) conserved Archaeal protein |
| [A] Sulfolobus islandicus (strain L.S.2.15 / Lassen #1) | SULIL01382 | KCY_SULIL | |
| [A] Sulfolobus islandicus (strain M.14.25 / Kamchatka #1) | SULIM01299 | KCY_SULIM | |
| [A] Sulfolobus islandicus (strain M.16.27) | SULIA01344 | KCY_SULIA | |
| [A] Sulfolobus islandicus (strain Y.G.57.14 / Yellowstone #1) | SULIY01395 | KCY_SULIY | |
| [A] Sulfolobus islandicus (strain Y.N.15.51 / Yellowstone #2) | SULIN01275 | KCY_SULIN | |
| [A] Sulfolobus solfataricus | SULSO00624 | KCY_SULSO | Cytidylate kinase |
| [A] Sulfolobus tokodaii | SULTO00450 | KCY_SULTO | hypothetical adenylate kinase |
| [A] Thermofilum pendens (strain Hrk 5) | THEPD00620 | A1RXV0 | Cytidylate kinase, putative |
| [A] Caldivirga maquilingensis (strain DSMZ 13496 / IC-167) | CALMQ00877 | A8MD76 | Cytidylate kinase, putative |
| [A] Pyrobaculum aerophilum | PYRAE02273 | KCY_PYRAE | Cytidylate kinase |
| [A] Pyrobaculum arsenaticum (strain DSM 13514 / JCM 11321) | PYRAR01308 | KCY_PYRAR | Cytidylate kinase, putative |
| [A] Pyrobaculum calidifontis (strain JCM 11548 / VA1) | PYRCJ01094 | KCY_PYRCJ | Cytidylate kinase, putative |
| [A] Pyrobaculum islandicum (strain DSM 4184 / JCM 9189) | PYRIL00393 | KCY_PYRIL | Cytidylate kinase, putative |
| [A] Thermoproteus neutrophilus (strain DSM 2338 / JCM 9278 / V24Sta) | THENV01688 | KCY_THENV | Cytidylate kinase |
| [A] Archaeoglobus fulgidus | ARCFU01865 | KCY_ARCFU | Cytidylate kinase |
| [A] Haloarcula marismortui | HALMA02944 | KCY_HALMA | cytidylate kinase |
| [A] Halobacterium salinarium | HALSA01315 | KCY_HALSA | Cytidylate kinase |
| [A] Halobacterium salinarum (strain ATCC 29341 / DSM 671 / R1) | HALS301364 | KCY_HALS3 | Cytidylate kinase |
| [A] Haloquadratum walsbyi (strain DSM 16790) | HALWD01830 | KCY_HALWD | cytidylate kinase |
| [A] Halorubrum lacusprofundi (strain ATCC 49239 / DSM 5036 / JCM 8891 / ACAM 34) | HALLT01771 | KCY_HALLT | Cytidylate kinase |
| [A] Natronomonas pharaonis (strain DSM 2160 / ATCC 35678) | NATPD02405 | KCY_NATPD | cytidylate kinase (EC 2.7.4.14) |
| [A] Methanobrevibacter smithii (strain PS / ATCC 35061 / DSM 861) | METS300725 | KCY_METS3 | Cytidylate kinase, Cmk |
| [A] Methanosphaera stadtmanae (strain DSM 3091) | METST00845 | KCY_METST | putative cytidylate kinase |
| [A] Methanocaldococcus jannaschii | METJA00673 | KCY_METJA | Cytidylate kinase |
| [A] Methanococcus aeolicus (strain Nankai-3 / ATCC BAA-1280) | META301111 | KCY_META3 | Cytidylate kinase, putative |
| [A] Methanococcus maripaludis | METMP00626 | KCY_METMP | Cytidylate kinase |
| [A] Methanococcus maripaludis (strain C5 / ATCC BAA-1333) | METM500967 | KCY_METM5 | Cytidylate kinase, putative |
| [A] Methanococcus maripaludis (strain C6 / ATCC BAA-1332) | METM600259 | KCY_METM6 | Cytidylate kinase |
| [A] Methanococcus maripaludis (strain C7 / ATCC BAA-1331) | METM701631 | KCY_METM7 | Cytidylate kinase, putative |
| [A] Methanococcus vannielii (strain SB / ATCC 35089 / DSM 1224) | METVS01461 | KCY_METVS | Cytidylate kinase, putative |
| [A] Methanoregula boonei (strain 6A8) | METB600552 | KCY_METB6 | Cytidylate kinase, putative |
| [A] Methanocorpusculum labreanum (strain ATCC 43576 / DSM 4855 / Z) | METLZ00106 | KCY_METLZ | Hypothetical protein |
| [A] Methanoculleus marisnigri (strain ATCC 35101 / DSM 1498 / JR1) | METMJ00575 | KCY_METMJ | Cytidylate kinase, putative |
| [A] Methanosphaerula palustris (strain ATCC BAA-1556 / DSM 19958 / E1-9c) | METPE00446 | KCY_METPE | Cytidylate kinase |
| [A] Methanospirillum hungatei (strain JF-1 / DSM 864) | METHJ02105 | KCY_METHJ | Cytidylate kinase, putative |
| [A] Methanosaeta thermophila (strain DSM 6194 / PT) | METTP01643 | KCY_METTP | cytidylate kinase, putative TIGRFAM: cytidylate kinase, putative KEGG: afu:AF1900 cytidylate kinase |
| [A] Methanococcoides burtonii (strain DSM 6242) | METBU00027 | KCY_METBU | Cytidylate kinase, putative |
| [A] Methanosarcina acetivorans | METAC01059 | KCY_METAC | Cytidylate kinase |
| [A] Methanosarcina barkeri (strain Fusaro / DSM 804) | METBF00074 | KCY_METBF | cytidylate kinase |
| [A] Methanosarcina mazei | METMA02107 | KCY_METMA | Cytidylate kinase |
| [A] Methanopyrus kandleri | METKA00022 | KCY_METKA | Cytidylate kinase |
| [A] Pyrococcus abyssi | PYRAB01148 | KCY_PYRAB | Cytidylate kinase |
| [A] Pyrococcus furiosus | PYRFU00809 | KCY_PYRFU | Cytidylate kinase |
| [A] Pyrococcus horikoshii | PYRHO01310 | KCY_PYRHO | Cytidylate kinase |
| [A] Thermococcus kodakaraensis | PYRKO01508 | KCY_PYRKO | cytidylate kinase |
| [A] Thermococcus onnurineus (strain NA1) | THEON00095 | B6YSP1 | Cytidylate kinase |
| [A] Picrophilus torridus | PICTO00666 | Q6L1A1 | Cytidylate kinase |
| [A] Thermoplasma volcanium | THEVO00355 | KCY_THEVO | Cytidylate kinase |
| [A] Uncultured methanogenic archaeon RC-I | UNCMA00619 | KCY_UNCMA | cytidylate kinase |
| [B] Borrelia afzelii (strain PKo) | BORAP00829 | KCY2_BORAP | Hypothetical protein |
| [B] Borrelia burgdorferi | BORBU00819 | KCY2_BORBU | similar to GB:L77117 SP:Q58071 PID:1591369 percent identity: 38.76; identified by sequence similarity; putative cytidylate kinase (cmk-2) |
| [B] Borrelia burgdorferi (strain ZS7) | BORBZ00783 | B7J0R4 | Cytidylate kinase |
| [B] Borrelia duttonii (strain Ly) | BORDL00789 | B5RN17 | Cytidylate kinase |
| [B] Borrelia garinii | BORGA00807 | KCY2_BORGA | Cytidylate kinase 2 |
| [B] Borrelia hermsii (strain DAH) | BORHD00793 | B2S1G3 | Cytidylate kinase |
| [B] Borrelia recurrentis (strain A1) | BORRA00774 | B5RQF6 | Cytidylate kinase |
| [B] Borrelia turicatae (strain 91E135) | BORT900791 | A1R0P4 | Cytidylate kinase |
| [B] Treponema denticola | TREDE01077 | Q73NR5 | identified by similarity to SP:O58988; match to protein family HMM PF02224 cytidylate kinase |
| [B] Treponema pallidum | TREPA00340 | NP_218782.1 | similar to GB:AE000783 percent identity: 42.53; identified by sequence similarity; putative cytidylate kinase (cmk) |
| [B] Treponema pallidum subsp. pallidum (strain SS14) | TREPS00339 | B2S2T9 | Cytidylate kinase |