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Pfam 22.0 ::
Browse Families - C
Browse available alignments and models |
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Available sections: Numbers A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Top twenty families
| C | |||||||
| Name | acc number | #seed | #full | av. len | av. %id | structure | Description |
|---|---|---|---|---|---|---|---|
| c-SKI_SMAD_bind | PF08782 | 9 | 60 | 91 aa | 50% | 1mr1 | c-SKI Smad4 binding domain |
| C1-set | PF07654 | 128 | 6757 | 81 aa | 37% |   | Immunoglobulin C1-set domain |
| C1q | PF00386 | 46 | 348 | 115 aa | 32% | 1c28 | C1q domain |
| C1_1 | PF00130 | 46 | 1334 | 52 aa | 30% | 2cpk | Phorbol esters/diacylglycerol binding domain (C1 domain) |
| C1_2 | PF03107 | 97 | 406 | 30 aa | 34% |   | C1 domain |
| C1_3 | PF07649 | 196 | 577 | 29 aa | 34% |   | C1-like domain |
| C1_4 | PF07975 | 16 | 54 | 50 aa | 46% |   | TFIIH C1-like domain |
| C2 | PF00168 | 394 | 3892 | 84 aa | 22% | 1qas | C2 domain |
| C2-set | PF05790 | 27 | 131 | 77 aa | 25% |   | Immunoglobulin C2-set domain |
| C2-set_2 | PF08205 | 33 | 583 | 83 aa | 20% | 1dr9 | CD80-like C2-set immunoglobulin domain |
| C4 | PF01413 | 26 | 191 | 109 aa | 48% | 1li1 | C-terminal tandem repeated domain in type 4 procollagen |
| C4dic_mal_tran | PF03595 | 50 | 335 | 267 aa | 20% |   | C4-dicarboxylate transporter/malic acid transport protein |
| C5-epim_C | PF06662 | 5 | 24 | 182 aa | 50% |   | D-glucuronyl C5-epimerase C-terminus |
| C6 | PF01681 | 20 | 43 | 92 aa | 24% |   | C6 domain |
| C8 | PF08742 | 135 | 394 | 72 aa | 29% |   | C8 domain |
| Caa3_CtaG | PF09678 | 29 | 161 | 242 aa | 24% |   | Cytochrome c oxidase caa3 assembly factor (Caa3_CtaG) |
| Cache_1 | PF02743 | 21 | 981 | 68 aa | 23% |   | Cache domain |
| Cache_2 | PF08269 | 34 | 475 | 91 aa | 25% |   | Cache domain |
| Cad | PF03596 | 6 | 84 | 184 aa | 43% |   | Cadmium resistance transporter |
| Cadherin | PF00028 | 57 | 7701 | 89 aa | 24% | 1nci | Cadherin domain |
| Cadherin_2 | PF08266 | 79 | 539 | 84 aa | 40% |   | Cadherin-like |
| Cadherin_C | PF01049 | 20 | 264 | 139 aa | 41% | 1i7w | Cadherin cytoplasmic region |
| Cadherin_pro | PF08758 | 55 | 86 | 83 aa | 30% | 1op4 | Cadherin prodomain like |
| Caenor_Her-1 | PF09232 | 3 | 5 | 124 aa | 51% | 1szh | Caenorhabditis elegans Her-1 |
| Caerin_1 | PF07440 | 2 | 22 | 23 aa | 83% |   | Caerin 1 protein |
| CAF1 | PF04857 | 29 | 211 | 287 aa | 27% | 1uoc | CAF1 family ribonuclease |
| CagA | PF03507 | 4 | 579 | 145 aa | 65% |   | CagA exotoxin |
| CagE_TrbE_VirB | PF03135 | 15 | 380 | 188 aa | 24% |   | CagE, TrbE, VirB family, component of type IV transporter system |
| CagX | PF03524 | 13 | 336 | 226 aa | 26% |   | Conjugal transfer protein |
| CagY_M | PF07337 | 15 | 549 | 31 aa | 52% |   | DC-EC Repeat |
| CagZ | PF09053 | 3 | 17 | 199 aa | 98% |   | CagZ |
| CaKB | PF03185 | 4 | 25 | 193 aa | 43% | 1jo6 | Calcium-activated potassium channel, beta subunit |
| Calcipressin | PF04847 | 9 | 89 | 174 aa | 43% |   | Calcipressin |
| CALCOCO1 | PF07888 | 3 | 65 | 421 aa | 39% |   | Calcium binding and coiled-coil domain (CALCOCO1) like |
| Calcyon | PF06387 | 3 | 32 | 172 aa | 55% |   | D1 dopamine receptor-interacting protein (calcyon) |
| Calc_CGRP_IAPP | PF00214 | 10 | 101 | 37 aa | 46% | 1bzb | Calcitonin / CGRP / IAPP family |
| Caldesmon | PF02029 | 2 | 60 | 200 aa | 25% |   | Caldesmon |
| Caleosin | PF05042 | 9 | 55 | 162 aa | 45% |   | Caleosin related protein |
| Calici_coat | PF00915 | 11 | 2093 | 139 aa | 50% |   | Calicivirus coat protein |
| Calici_coat_C | PF08435 | 29 | 423 | 211 aa | 54% |   | Calicivirus coat protein C-terminal |
| Calici_MSP | PF05752 | 7 | 54 | 164 aa | 48% |   | Calicivirus minor structural protein |
| Calici_PP_N | PF08405 | 6 | 53 | 491 aa | 62% |   | Viral polyprotein N-terminal |
| Calmodulin_bind | PF07887 | 9 | 58 | 249 aa | 34% |   | Calmodulin binding protein-like |
| Calpain_III | PF01067 | 14 | 285 | 134 aa | 37% | 1dkv | Calpain large subunit, domain III |
| Calpain_inhib | PF00748 | 14 | 182 | 117 aa | 37% | 1nx1 | Calpain inhibitor |
| Calponin | PF00402 | 5 | 321 | 25 aa | 57% |   | Calponin family repeat |
| Calreticulin | PF00262 | 10 | 303 | 298 aa | 48% | 1jhn | Calreticulin family |
| Calsarcin | PF05556 | 4 | 33 | 270 aa | 41% |   | Calcineurin-binding protein (Calsarcin) |
| Calsequestrin | PF01216 | 3 | 42 | 319 aa | 63% | 1a8y | Calsequestrin |
| Calx-beta | PF03160 | 36 | 749 | 85 aa | 32% |   | Calx-beta domain |
| CaMBD | PF02888 | 8 | 73 | 75 aa | 63% | 1kkd | Calmodulin binding domain |
| CaMKII_AD | PF08332 | 7 | 181 | 107 aa | 57% |   | Calcium/calmodulin dependent protein kinase II Association |
| Campylo_MOMP | PF05538 | 2 | 120 | 379 aa | 74% |   | Campylobacter major outer membrane protein |
| CAMP_factor | PF07373 | 3 | 42 | 202 aa | 51% |   | CAMP factor (Cfa) |
| CamS | PF07537 | 8 | 68 | 312 aa | 37% |   | CamS sex pheromone cAM373 precursor |
| CaM_binding | PF07839 | 17 | 34 | 101 aa | 37% |   | Plant calmodulin-binding domain |
| Candida_ALS | PF05792 | 3 | 98 | 396 aa | 52% |   | Candida agglutinin-like protein (ALS) |
| CAP160 | PF07918 | 9 | 15 | 27 aa | 66% |   | CAP160 repeat |
| Capsid_Iridovir | PF04451 | 12 | 313 | 272 aa | 32% | 1j5q | Iridovirus major capsid protein |
| Capsule_synth | PF05159 | 23 | 310 | 230 aa | 26% |   | Capsule polysaccharide biosynthesis protein |
| Caps_synth | PF05704 | 8 | 40 | 276 aa | 25% |   | Capsular polysaccharide synthesis protein |
| CAP_C | PF08603 | 6 | 98 | 158 aa | 43% | 1kq5 | DE Adenylate cyclase associated (CAP) C terminal |
| CAP_GLY | PF01302 | 40 | 351 | 67 aa | 39% | 1lpl | CAP-Gly domain |
| CAP_N | PF01213 | 6 | 102 | 263 aa | 41% | 1s0p | Adenylate cyclase associated (CAP) N terminal |
| Carboxyl_trans | PF01039 | 34 | 1860 | 304 aa | 30% | 1od2 | Carboxyl transferase domain |
| CarbpepA_inh | PF02977 | 2 | 3 | 38 aa | 81% | 4cpa | Carboxypeptidase A inhibitor |
| Carbpep_Y_N | PF05388 | 4 | 8 | 117 aa | 32% |   | Carboxypeptidase Y pro-peptide |
| Carb_anhydrase | PF00194 | 14 | 646 | 175 aa | 30% | 1can | Eukaryotic-type carbonic anhydrase |
| Carb_kinase | PF01256 | 9 | 581 | 236 aa | 30% | 1kyh | Carbohydrate kinase |
| Carcinustatin | PF08261 | 2 | 12 | 8 aa | 88% |   | Carcinustatin peptide |
| CARD | PF00619 | 61 | 327 | 84 aa | 21% | 3crd | Caspase recruitment domain |
| CARDB | PF07705 | 72 | 193 | 105 aa | 25% |   | CARDB |
| CarD_TRCF | PF02559 | 52 | 736 | 101 aa | 31% |   | CarD-like/TRCF domain |
| Carla_C4 | PF01623 | 10 | 118 | 89 aa | 48% |   | Carlavirus putative nucleic acid binding protein |
| Carmo_coat_C | PF08462 | 8 | 26 | 99 aa | 98% |   | Carmovirus coat protein |
| Carn_acyltransf | PF00755 | 19 | 295 | 497 aa | 30% | 1ndi | Choline/Carnitine o-acyltransferase |
| Carot_N | PF09150 | 8 | 27 | 154 aa | 45% | 1m98 | Orange carotenoid protein, N-terminal |
| CART | PF06373 | 3 | 25 | 98 aa | 65% | 1hy9 | Cocaine and amphetamine regulated transcript protein (CART) |
| Cas1p | PF07779 | 6 | 45 | 209 aa | 44% |   | Cas1p-like protein |
| Cas6 | PF09559 | 10 | 13 | 180 aa | 32% |   | Cas6 Crispr |
| Casein | PF00363 | 15 | 87 | 73 aa | 28% |   | Casein |
| Casein_kappa | PF00997 | 9 | 156 | 132 aa | 71% |   | Kappa casein |
| CASP_C | PF08172 | 10 | 50 | 225 aa | 38% |   | CASP C terminal |
| Cas_APE2256 | PF09651 | 13 | 23 | 134 aa | 27% |   | CRISPR-associated protein (Cas_APE2256) |
| Cas_Cas02710 | PF09670 | 11 | 21 | 316 aa | 22% |   | CRISPR-associated protein (Cas_Cas02710) |
| Cas_Cas2CT1978 | PF09707 | 26 | 53 | 84 aa | 46% |   | CRISPR-associated protein (Cas_Cas2CT1978) |
| Cas_Cas5a | PF09705 | 11 | 15 | 168 aa | 24% |   | CRISPR-associated protein (Cas_Cas5a) |
| Cas_Cas5d | PF09704 | 35 | 54 | 201 aa | 39% |   | CRISPR-associated protein (Cas_Cas5d) |
| Cas_Cas5e | PF09708 | 51 | 66 | 152 aa | 36% |   | CRISPR-associated protein (Cas_Cas5e) |
| Cas_Cmr3 | PF09700 | 25 | 30 | 355 aa | 20% |   | CRISPR-associated protein (Cas_Cmr3) |
| Cas_Cmr5 | PF09701 | 16 | 21 | 121 aa | 27% |   | CRISPR-associated protein (Cas_Cmr5) |
| Cas_Csa4 | PF09703 | 6 | 6 | 356 aa | 22% |   | CRISPR-associated protein (Cas_Csa4) |
| Cas_Csa5 | PF09702 | 5 | 8 | 95 aa | 39% |   | CRISPR-associated protein (Cas_Csa5) |
| Cas_Csd1 | PF09709 | 36 | 60 | 539 aa | 25% |   | CRISPR-associated protein (Cas_Csd1) |
| CAS_CSE1 | PF03378 | 4 | 57 | 366 aa | 34% |   | CAS/CSE protein, C-terminus |
| Cas_Csm6 | PF09659 | 4 | 11 | 298 aa | 37% |   | CRISPR-associated protein (Cas_Csm6) |
| Cas_Csn2 | PF09711 | 5 | 19 | 185 aa | 74% |   | CRISPR-associated protein (Cas_Csn2) |
| Cas_csx3 | PF09620 | 7 | 8 | 81 aa | 46% |   | CRISPR-associated protein (Cas_csx3) |
| Cas_Csx8 | PF09657 | 3 | 3 | 450 aa | 41% |   | CRISPR-associated protein Csx8 (Cas_Csx8) |
| Cas_Csx9 | PF09658 | 3 | 3 | 375 aa | 67% |   | CRISPR-associated protein (Cas_Csx9) |
| Cas_Csy1 | PF09611 | 19 | 25 | 361 aa | 37% |   | CRISPR-associated protein (Cas_Csy1) |
| Cas_Csy2 | PF09614 | 18 | 28 | 283 aa | 37% |   | CRISPR-associated protein (Cas_Csy2) |
| Cas_Csy3 | PF09615 | 23 | 31 | 332 aa | 49% |   | CRISPR-associated protein (Cas_Csy3) |
| Cas_Csy4 | PF09618 | 25 | 33 | 185 aa | 36% |   | CRISPR-associated protein (Cas_Csy4) |
| Cas_CT1975 | PF09344 | 25 | 69 | 352 aa | 33% |   | CT1975-like protein |
| Cas_CXXC_CXXC | PF09706 | 9 | 11 | 64 aa | 27% |   | CRISPR-associated protein (Cas_CXXC_CXXC) |
| Cas_DxTHG | PF09455 | 14 | 27 | 304 aa | 19% |   | CRISPR-associated (Cas) DxTHG family |
| Cas_GSU0053 | PF09617 | 4 | 4 | 170 aa | 27% |   | CRISPR-associated protein GSU0053 (Cas_GSU0053) |
| Cas_GSU0054 | PF09609 | 4 | 4 | 490 aa | 23% |   | CRISPR-associated protein, GSU0054 family (Cas_GSU0054) |
| Cas_NE0113 | PF09623 | 14 | 17 | 215 aa | 28% |   | CRISPR-associated protein NE0113 (Cas_NE0113) |
| Cas_TM1802 | PF09484 | 13 | 16 | 550 aa | 21% |   | CRISPR-associated protein TM1802 (cas_TM1802) |
| Cas_TM1812 | PF09530 | 22 | 28 | 194 aa | 28% |   | CRISPR-associated protein (cas_TM1812) |
| Cas_VVA1548 | PF09652 | 6 | 8 | 92 aa | 39% |   | Putative CRISPR-associated protein (Cas_VVA1548) |
| CAT | PF00302 | 12 | 128 | 194 aa | 39% | 3cla | Chloramphenicol acetyltransferase |
| Catalase | PF00199 | 21 | 943 | 349 aa | 46% | 7cat | Catalase |
| Catalase-rel | PF06628 | 24 | 185 | 54 aa | 42% | 1ggh | Catalase-related |
| Cathelicidins | PF00666 | 8 | 83 | 66 aa | 64% | 1lyp | Cathelicidin |
| CathepsinC_exc | PF08773 | 10 | 52 | 102 aa | 47% | 1k3b | Cathepsin C exclusion domain |
| Cation_ATPase_C | PF00689 | 67 | 1284 | 159 aa | 20% | 1eul | Cation transporting ATPase, C-terminus |
| Cation_ATPase_N | PF00690 | 155 | 1626 | 77 aa | 25% | 1eul | Cation transporter/ATPase, N-terminus |
| Cation_efflux | PF01545 | 74 | 1916 | 251 aa | 20% |   | Cation efflux family |
| CAT_RBD | PF03123 | 15 | 199 | 57 aa | 38% | 1h99 | CAT RNA binding domain |
| Caudal_act | PF04731 | 9 | 42 | 127 aa | 43% |   | Caudal like protein activation region |
| Caudo_TAP | PF02413 | 29 | 161 | 125 aa | 28% |   | Caudovirales tail fibre assembly protein |
| Cauli_AT | PF03233 | 3 | 26 | 130 aa | 69% |   | Aphid transmission protein |
| Cauli_DNA-bind | PF03310 | 3 | 20 | 99 aa | 64% |   | Caulimovirus DNA-binding protein |
| Cauli_VI | PF01693 | 7 | 33 | 401 aa | 43% |   | Caulimovirus viroplasmin |
| Caveolin | PF01146 | 5 | 134 | 157 aa | 52% |   | Caveolin |
| CAV_VP3 | PF04771 | 7 | 62 | 103 aa | 97% |   | Chicken anaemia virus VP-3 protein |
| Ca_channel_B | PF00774 | 5 | 113 | 194 aa | 72% |   | Dihydropyridine sensitive L-type calcium channel (Beta subunit) |
| Ca_chan_IQ | PF08763 | 13 | 135 | 34 aa | 52% |   | Voltage gated calcium channel IQ domain |
| CBAH | PF02275 | 8 | 244 | 260 aa | 25% | 3pva | Linear amide C-N hydrolases, choloylglycine hydrolase family |
| Cbb3_Q_epsi | PF09672 | 8 | 15 | 56 aa | 50% |   | Cytochrome c oxidase cbb3-type (Cbb3_Q_epsi) |
| CbbQ_C | PF08406 | 32 | 120 | 85 aa | 40% |   | CbbQ/NirQ/NorQ C-terminal |
| CBF | PF03914 | 19 | 133 | 166 aa | 29% |   | CBF/Mak21 family |
| CBFB_NFYA | PF02045 | 10 | 116 | 57 aa | 66% |   | CCAAT-binding transcription factor (CBF-B/NF-YA) subunit B |
| CBFD_NFYB_HMF | PF00808 | 28 | 544 | 64 aa | 29% | 1bfm | Histone-like transcription factor (CBF/NF-Y) and archaeal histone |
| CBFNT | PF08143 | 5 | 28 | 67 aa | 55% |   | CBFNT (NUC161) domain |
| CBF_beta | PF02312 | 3 | 29 | 151 aa | 62% | 1cl3 | Core binding factor beta subunit |
| CbiA | PF01656 | 80 | 3104 | 214 aa | 18% | 1dts | CobQ/CobB/MinD/ParA nucleotide binding domain |
| CbiC | PF02570 | 7 | 257 | 198 aa | 39% | 1f2v | Precorrin-8X methylmutase |
| CbiD | PF01888 | 6 | 190 | 290 aa | 36% |   | CbiD |
| CbiG | PF01890 | 6 | 267 | 185 aa | 28% |   | CbiG |
| CbiJ | PF02571 | 4 | 191 | 241 aa | 30% |   | Precorrin-6x reductase CbiJ/CobK |
| CbiK | PF06180 | 8 | 56 | 256 aa | 36% | 1qgo | Cobalt chelatase (CbiK) |
| CbiM | PF01891 | 12 | 212 | 183 aa | 29% |   | CbiM |
| CbiN | PF02553 | 12 | 70 | 71 aa | 44% |   | Cobalt transport protein component CbiN |
| CbiQ | PF02361 | 21 | 734 | 205 aa | 20% |   | Cobalt transport protein |
| CbiX | PF01903 | 76 | 493 | 102 aa | 23% |   | CbiX |
| CbiZ | PF01955 | 22 | 77 | 192 aa | 28% |   | Adenosylcobinamide amidohydrolase |
| CblD | PF07434 | 5 | 25 | 319 aa | 37% |   | CblD like pilus biogenesis initiator |
| Cbl_N | PF02262 | 3 | 37 | 122 aa | 60% | 1b47 | CBL proto-oncogene N-terminal domain 1 |
| Cbl_N2 | PF02761 | 3 | 38 | 80 aa | 67% | 1b47 | CBL proto-oncogene N-terminus, EF hand-like domain |
| Cbl_N3 | PF02762 | 3 | 35 | 84 aa | 79% | 1b47 | CBL proto-oncogene N-terminus, SH2-like domain |
| CBM27 | PF09212 | 2 | 6 | 171 aa | 53% | 1oh4 | Carbohydrate binding module 27 |
| CBM49 | PF09478 | 28 | 100 | 84 aa | 27% |   | Carbohydrate binding domain CBM49 |
| CBM_1 | PF00734 | 18 | 318 | 29 aa | 53% | 1cel | Fungal cellulose binding domain |
| CBM_10 | PF02013 | 38 | 163 | 35 aa | 45% | 1qld | Cellulose or protein binding domain |
| CBM_11 | PF03425 | 5 | 16 | 182 aa | 25% |   | Carbohydrate binding domain (family 11) |
| CBM_14 | PF01607 | 210 | 1526 | 51 aa | 25% | 1dqc | Chitin binding Peritrophin-A domain |
| CBM_15 | PF03426 | 2 | 2 | 158 aa | 58% | 1gny | Carbohydrate binding domain (family 15) |
| CBM_17_28 | PF03424 | 7 | 33 | 166 aa | 34% | 1g0c | Carbohydrate binding domain (family 17/28) |
| CBM_19 | PF03427 | 2 | 9 | 51 aa | 44% |   | Carbohydrate binding domain (family 19) |
| CBM_2 | PF00553 | 17 | 283 | 93 aa | 30% | 1exg | Cellulose binding domain |
| CBM_20 | PF00686 | 20 | 255 | 87 aa | 31% | 1cdg | Starch binding domain |
| CBM_21 | PF03370 | 8 | 116 | 112 aa | 32% |   | Putative phosphatase regulatory subunit |
| CBM_25 | PF03423 | 9 | 36 | 84 aa | 39% |   | Carbohydrate binding domain (family 25) |
| CBM_3 | PF00942 | 29 | 178 | 82 aa | 30% | 1nbc | Cellulose binding domain |
| CBM_4_9 | PF02018 | 47 | 427 | 139 aa | 16% | 1ulp | Carbohydrate binding domain |
| CBM_5_12 | PF02839 | 49 | 543 | 39 aa | 34% | 1ed7 | Carbohydrate binding domain |
| CBM_6 | PF03422 | 41 | 287 | 121 aa | 23% | 1gmm | Carbohydrate binding module (family 6) |
| CBM_X | PF06204 | 17 | 165 | 60 aa | 34% |   | Putative carbohydrate binding domain |
| CBP4 | PF07960 | 7 | 21 | 110 aa | 37% |   | CBP4 |
| CBS | PF00571 | 438 | 6974 | 119 aa | 18% | 1zfj | CBS domain pair |
| CbtA | PF09490 | 15 | 28 | 225 aa | 44% |   | Probable cobalt transporter subunit (CbtA) |
| CbtB | PF09489 | 16 | 23 | 55 aa | 43% |   | Probable cobalt transporter subunit (CbtB) |
| CC | PF04942 | 20 | 60 | 32 aa | 33% |   | CC domain |
| CCD | PF07860 | 2 | 5 | 112 aa | 86% |   | WisP family C-Terminal Region |
| CcdA | PF07362 | 2 | 39 | 72 aa | 41% |   | Post-segregation antitoxin CcdA |
| CcdB | PF01845 | 2 | 32 | 100 aa | 63% | 4vub | CcdB protein |
| CCG | PF02754 | 65 | 1871 | 63 aa | 22% |   | Cysteine-rich domain |
| CcmB | PF03379 | 13 | 299 | 207 aa | 34% |   | CcmB protein |
| CcmD | PF04995 | 14 | 135 | 45 aa | 31% |   | Heme exporter protein D (CcmD) |
| CcmE | PF03100 | 10 | 233 | 131 aa | 45% | 1j6q | CcmE |
| CcmH | PF03918 | 7 | 265 | 142 aa | 35% |   | Cytochrome C biogenesis protein |
| CcoS | PF03597 | 11 | 163 | 49 aa | 39% |   | Cytochrome oxidase maturation protein cbb3-type |
| CCP_MauG | PF03150 | 11 | 333 | 180 aa | 32% | 1eb7 | Di-haem cytochrome c peroxidase |
| CCT | PF06203 | 49 | 301 | 44 aa | 54% |   | CCT motif |
| CCT_2 | PF09425 | 19 | 58 | 26 aa | 61% |   | Divergent CCT motif |
| CD20 | PF04103 | 16 | 80 | 134 aa | 28% |   | CD20/IgE Fc receptor beta subunit family |
| CD225 | PF04505 | 6 | 69 | 80 aa | 39% |   | Interferon-induced transmembrane protein |
| CD34_antigen | PF06365 | 8 | 42 | 180 aa | 42% |   | CD34/Podocalyxin family |
| CD36 | PF01130 | 11 | 192 | 365 aa | 26% |   | CD36 family |
| CD4-extracel | PF09191 | 9 | 36 | 106 aa | 71% | 1cid | CD4, extracellular |
| CD47 | PF04549 | 11 | 46 | 154 aa | 41% |   | CD47 transmembrane region |
| CDC13-DNA-bind | PF09283 | 4 | 4 | 177 aa | 25% | 1s40 | CDC13, ssDNA binding |
| CDC14 | PF08045 | 5 | 19 | 248 aa | 47% |   | Cell division control protein 14, SIN component |
| CDC24 | PF06395 | 3 | 22 | 88 aa | 42% |   | CDC24 Calponin |
| CDC27 | PF09507 | 20 | 63 | 321 aa | 29% |   | DNA polymerase subunit Cdc27 |
| CDC37_C | PF08564 | 20 | 60 | 88 aa | 33% | 1us7 | Cdc37 C terminal domain |
| CDC37_M | PF08565 | 20 | 76 | 155 aa | 34% | 1us7 | Cdc37 Hsp90 binding domain |
| CDC37_N | PF03234 | 22 | 77 | 117 aa | 40% | 1us7 | Cdc37 N terminal kinase binding |
| CDC45 | PF02724 | 7 | 62 | 603 aa | 30% |   | CDC45-like protein |
| CDC48_2 | PF02933 | 91 | 165 | 84 aa | 20% | 1cz4 | Cell division protein 48 (CDC48), domain 2 |
| CDC48_N | PF02359 | 23 | 260 | 83 aa | 26% | 1cz4 | Cell division protein 48 (CDC48), N-terminal domain |
| CDC50 | PF03381 | 10 | 167 | 249 aa | 33% |   | LEM3 (ligand-effect modulator 3) family / CDC50 family |
| Cdc6_C | PF09079 | 51 | 188 | 79 aa | 29% | 1fnn | CDC6, C terminal |
| CDC73 | PF05179 | 6 | 64 | 272 aa | 25% |   | RNA pol II accessory factor, Cdc73 family |
| CDH | PF02611 | 3 | 47 | 244 aa | 46% |   | CDP-diacylglycerol pyrophosphatase |
| CdhC | PF03598 | 5 | 40 | 401 aa | 49% | 1mjg | CO dehydrogenase/acetyl-CoA synthase complex beta subunit |
| CdhD | PF03599 | 9 | 73 | 346 aa | 30% |   | CO dehydrogenase/acetyl-CoA synthase delta subunit |
| CDI | PF02234 | 22 | 109 | 50 aa | 38% | 1jsu | Cyclin-dependent kinase inhibitor |
| CDK5_activator | PF03261 | 5 | 43 | 278 aa | 58% | 1h4l | Cyclin-dependent kinase 5 activator protein |
| CDKN3 | PF05706 | 2 | 22 | 160 aa | 73% | 1fq1 | Cyclin-dependent kinase inhibitor 3 (CDKN3) |
| CDO_I | PF05995 | 8 | 144 | 165 aa | 23% |   | Cysteine dioxygenase type I |
| CDP-OH_P_transf | PF01066 | 68 | 1726 | 132 aa | 20% |   | CDP-alcohol phosphatidyltransferase |
| CDP-OH_P_tran_2 | PF08009 | 5 | 29 | 37 aa | 44% |   | CDP-alcohol phosphatidyltransferase 2 |
| CDRN | PF05174 | 5 | 6 | 55 aa | 74% |   | Cysteine-rich D. radiodurans N terminus |
| CDT1 | PF08839 | 11 | 29 | 157 aa | 29% | 1wlq | DNA replication factor CDT1 like |
| CDtoxinA | PF03498 | 10 | 63 | 145 aa | 27% |   | Cytolethal distending toxin A/C family |
| Cecropin | PF00272 | 16 | 114 | 31 aa | 48% | 1f0d | Cecropin family |
| CelD_N | PF02927 | 15 | 63 | 88 aa | 31% | 1clc | N-terminal ig-like domain of cellulase |
| Cellsynth_D | PF03500 | 2 | 5 | 134 aa | 87% |   | Cellulose synthase subunit D |
| Cellulase | PF00150 | 65 | 822 | 245 aa | 17% | 2exo | Cellulase (glycosyl hydrolase family 5) |
| Cellulose_synt | PF03552 | 15 | 353 | 497 aa | 42% |   | Cellulose synthase |
| CemA | PF03040 | 14 | 132 | 221 aa | 44% |   | CemA family |
| Cenp-B_dimeris | PF09026 | 2 | 9 | 95 aa | 92% |   | Centromere protein B dimerisation domain |
| CENP-B_N | PF04218 | 6 | 66 | 49 aa | 29% | 1bw6 | CENP-B N-terminal DNA-binding domain |
| CENP-H | PF05837 | 3 | 6 | 209 aa | 43% |   | Centromere protein H (CENP-H) |
| Cenp-O | PF09496 | 25 | 34 | 91 aa | 29% |   | Cenp-O kinetochore centromere component |
| CenpB-DNA-bind | PF09091 | 44 | 124 | 63 aa | 27% | 1hlv | Centromere binding protein B, DNA binding |
| CEP1-DNA_bind | PF09287 | 2 | 2 | 196 aa | 47% | 1t4w | CEP-1, DNA binding |
| Ceramidase_alk | PF04734 | 6 | 55 | 627 aa | 39% |   | Neutral/alkaline non-lysosomal ceramidase |
| Cerato-platanin | PF07249 | 5 | 33 | 114 aa | 54% |   | Cerato-platanin |
| CesT | PF05932 | 35 | 200 | 114 aa | 19% | 1jyo | Tir chaperone protein (CesT) |
| CfAFP | PF05264 | 4 | 32 | 75 aa | 57% | 1m8n | Choristoneura fumiferana antifreeze protein (CfAFP) |
| CFC | PF09443 | 9 | 24 | 35 aa | 54% |   | Cripto_Frl-1_Cryptic (CFC) |
| CFEM | PF05730 | 8 | 111 | 65 aa | 30% |   | CFEM domain |
| CG-1 | PF03859 | 4 | 48 | 113 aa | 52% |   | CG-1 domain |
| CGGC | PF08821 | 13 | 38 | 103 aa | 30% |   | CGGC domain |
| CGI-121 | PF08617 | 21 | 45 | 106 aa | 30% |   | Kinase binding protein CGI-121 |
| Cgr1 | PF03879 | 4 | 24 | 106 aa | 47% |   | Cgr1 family |
| CgtA | PF06306 | 2 | 37 | 285 aa | 58% |   | Beta-1,4-N-acetylgalactosaminyltransferase (CgtA) |
| CH | PF00307 | 192 | 2091 | 105 aa | 20% | 1aoa | Calponin homology (CH) domain |
| ChaB | PF06150 | 17 | 116 | 60 aa | 33% |   | ChaB |
| ChaC | PF04752 | 15 | 199 | 173 aa | 34% |   | ChaC-like protein |
| CHAD | PF05235 | 18 | 220 | 251 aa | 20% |   | CHAD domain |
| Chagasin_I42 | PF09394 | 38 | 88 | 99 aa | 26% |   | Chagasin peptidase inhibitor I42 |
| Chalcone | PF02431 | 11 | 89 | 168 aa | 56% | 1eyp | Chalcone-flavanone isomerase |
| Chal_sti_synt_C | PF02797 | 21 | 1296 | 129 aa | 55% | 1cml | Chalcone and stilbene synthases, C-terminal domain |
| Chal_sti_synt_N | PF00195 | 21 | 1135 | 173 aa | 59% | 1cml | Chalcone and stilbene synthases, N-terminal domain |
| Channel_Tsx | PF03502 | 2 | 74 | 136 aa | 48% |   | Nucleoside-specific channel-forming protein, Tsx |
| CHAP | PF05257 | 96 | 602 | 123 aa | 23% |   | CHAP domain |
| Chaperone_III | PF07824 | 3 | 11 | 110 aa | 54% |   | Type III secretion chaperone domain |
| ChAPs | PF09295 | 16 | 37 | 379 aa | 33% |   | ChAPs (Chs5p-Arf1p-binding proteins) |
| CHASE | PF03924 | 13 | 237 | 203 aa | 20% |   | CHASE domain |
| CHASE2 | PF05226 | 21 | 219 | 294 aa | 22% |   | CHASE2 domain |
| CHASE3 | PF05227 | 26 | 215 | 136 aa | 22% |   | CHASE3 domain |
| CHASE4 | PF05228 | 15 | 82 | 162 aa | 18% |   | CHASE4 domain |
| CHB_HEX | PF03173 | 6 | 71 | 160 aa | 32% | 1c7s | Putative carbohydrate binding domain |
| CHB_HEX_C | PF03174 | 5 | 51 | 65 aa | 45% | 1c7s | Chitobiase/beta-hexosaminidase C-terminal domain |
| CHCH | PF06747 | 46 | 362 | 40 aa | 20% |   | CHCH domain |
| CHD5 | PF04420 | 3 | 36 | 154 aa | 33% |   | CHD5-like protein |
| CHDCT2 | PF08074 | 3 | 37 | 165 aa | 82% |   | CHDCT2 (NUC038) domain |
| CHDNT | PF08073 | 6 | 34 | 54 aa | 68% |   | CHDNT (NUC034) domain |
| CheB_methylest | PF01339 | 8 | 671 | 181 aa | 36% | 1chd | CheB methylesterase |
| CheC | PF04509 | 33 | 530 | 33 aa | 29% | 1squ | CheC-like family |
| CheD | PF03975 | 10 | 196 | 113 aa | 32% |   | CheD |
| CheR | PF01739 | 22 | 731 | 193 aa | 31% | 1af7 | CheR methyltransferase, SAM binding domain |
| CheR_N | PF03705 | 85 | 623 | 56 aa | 22% | 1af7 | CheR methyltransferase, all-alpha domain |
| CheW | PF01584 | 252 | 1940 | 135 aa | 21% | 1b3q | CheW-like domain |
| CheY-binding | PF09078 | 30 | 53 | 64 aa | 46% | 1ffg | CheY binding |
| CheZ | PF04344 | 2 | 126 | 227 aa | 42% | 1kmi | Chemotaxis phosphatase, CheZ |
| CHGN | PF05679 | 6 | 56 | 463 aa | 28% |   | Chondroitin N-acetylgalactosaminyltransferase |
| ChiC | PF06483 | 7 | 35 | 176 aa | 50% |   | Chitinase C |
| ChitinaseA_N | PF08329 | 26 | 109 | 132 aa | 47% | 1ctn | Chitinase A, N-terminal domain |
| Chitin_bind_1 | PF00187 | 18 | 436 | 38 aa | 56% | 1wgt | Chitin recognition protein |
| Chitin_bind_3 | PF03067 | 26 | 233 | 201 aa | 27% |   | Chitin binding domain |
| Chitin_bind_4 | PF00379 | 68 | 784 | 65 aa | 33% |   | Insect cuticle protein |
| Chitin_synth_1 | PF01644 | 14 | 392 | 141 aa | 55% |   | Chitin synthase |
| Chitin_synth_1N | PF08407 | 41 | 116 | 79 aa | 45% |   | Chitin synthase N-terminal |
| Chitin_synth_2 | PF03142 | 10 | 328 | 252 aa | 44% |   | Chitin synthase |
| Chitosanase | PF07335 | 5 | 34 | 214 aa | 45% |   | Fungal chitosanase |
| CHL4 | PF05238 | 16 | 32 | 407 aa | 23% |   | Kinetochore protein CHL4 like |
| ChlamPMP_M | PF07548 | 55 | 235 | 171 aa | 26% |   | Chlamydia polymorphic membrane protein middle domain |
| Chlamy_scaf | PF09675 | 4 | 7 | 112 aa | 52% |   | Chlamydia-phage Chp2 scaffold (Chlamy_scaf) |
| Chlam_OMP | PF01308 | 3 | 625 | 249 aa | 70% |   | Chlamydia major outer membrane protein |
| Chlam_OMP3 | PF03503 | 3 | 10 | 53 aa | 76% |   | Chlamydia cysteine-rich outer membrane protein 3 |
| Chlam_OMP6 | PF03504 | 2 | 36 | 90 aa | 85% |   | Chlamydia cysteine-rich outer membrane protein 6 |
| Chlam_PMP | PF02415 | 528 | 3670 | 21 aa | 33% |   | Chlamydia polymorphic membrane protein (Chlamydia_PMP) |
| Chlam_vir | PF05475 | 3 | 19 | 178 aa | 69% |   | Chlamydia virulence protein PGP3-D |
| Chloroa_b-bind | PF00504 | 49 | 679 | 147 aa | 39% | 1rwt | Chlorophyll A-B binding protein |
| Chlorophyllase | PF07224 | 4 | 18 | 238 aa | 42% |   | Chlorophyllase |
| Chlorovi_GP_rpt | PF06598 | 37 | 123 | 31 aa | 43% |   | Chlorovirus glycoprotein repeat |
| Chlor_dismutase | PF06778 | 16 | 142 | 179 aa | 31% |   | Chlorite dismutase |
| CHMI | PF02962 | 3 | 109 | 113 aa | 34% | 1otg | 5-carboxymethyl-2-hydroxymuconate isomerase |
| CholecysA-Rec_N | PF09193 | 6 | 8 | 47 aa | 72% | 1d6g | Cholecystokinin A receptor, N-terminal |
| Choline_kinase | PF01633 | 38 | 278 | 200 aa | 25% |   | Choline/ethanolamine kinase |
| Choline_kin_N | PF04428 | 10 | 31 | 44 aa | 24% |   | Choline kinase N terminus |
| Chol_subst-bind | PF09129 | 3 | 9 | 323 aa | 63% | 1i19 | Cholesterol oxidase, substrate-binding |
| Chon_Sulph_att | PF06566 | 2 | 6 | 240 aa | 68% |   | Chondroitin sulphate attachment domain |
| CHORD | PF04968 | 11 | 132 | 63 aa | 46% |   | CHORD |
| Chordopox_A13L | PF05961 | 4 | 39 | 67 aa | 64% |   | Chordopoxvirus A13L protein |
| Chordopox_A15 | PF05846 | 6 | 29 | 90 aa | 60% |   | Chordopoxvirus A15 protein |
| Chordopox_A20R | PF05941 | 6 | 44 | 327 aa | 53% |   | Chordopoxvirus A20R protein |
| Chordopox_A30L | PF06015 | 5 | 42 | 72 aa | 56% |   | Chordopoxvirus A30L protein |
| Chordopox_A33R | PF05966 | 6 | 42 | 176 aa | 50% |   | Chordopoxvirus A33R protein |
| Chordopox_A35R | PF05989 | 6 | 36 | 157 aa | 50% |   | Chordopoxvirus A35R protein |
| Chordopox_E11 | PF06138 | 5 | 32 | 125 aa | 56% |   | Chordopoxvirus E11 protein |
| Chordopox_G2 | PF05796 | 7 | 42 | 221 aa | 57% |   | Chordopoxvirus protein G2 |
| Chordopox_G3 | PF06129 | 7 | 37 | 107 aa | 52% |   | Chordopoxvirus G3 protein |
| Chordopox_L2 | PF05803 | 6 | 31 | 86 aa | 58% |   | Chordopoxvirus L2 protein |
| Chordopox_RPO7 | PF05864 | 4 | 32 | 62 aa | 77% |   | Chordopoxvirus DNA-directed RNA polymerase 7 kDa polypeptide (RPO7) |
| Chorion_1 | PF01723 | 7 | 42 | 139 aa | 44% |   | Chorion protein |
| Chorion_2 | PF03964 | 8 | 19 | 118 aa | 30% |   | Chorion family 2 |
| Chorion_3 | PF05387 | 2 | 20 | 232 aa | 54% |   | Chorion family 3 |
| Chorion_S16 | PF05836 | 5 | 10 | 139 aa | 66% |   | Chorion protein S16 |
| Chorismate_bind | PF00425 | 25 | 1591 | 256 aa | 33% | 1qdl | chorismate binding enzyme |
| Chorismate_synt | PF01264 | 13 | 605 | 348 aa | 45% | 1q1l | Chorismate synthase |
| Chor_lyase | PF04345 | 3 | 155 | 145 aa | 31% | 1jd3 | Chorismate lyase |
| CHP02267_MYXXA | PF09543 | 16 | 18 | 121 aa | 47% |   | Protein of unknown function (CHP02267_MYXXA) |
| CHP02269_MYXXA | PF09533 | 8 | 9 | 215 aa | 46% |   | Predicted lipoprotein of unknown function (CHP02269_MYXXA) |
| CHP02301 | PF09539 | 12 | 32 | 95 aa | 46% |   | Protein of unknown function (CHP02301) |
| CHP02328 | PF09541 | 11 | 17 | 120 aa | 63% |   | Protein of unknown function (CHP02328) |
| CHP02336 | PF09508 | 7 | 13 | 728 aa | 50% |   | Protein of unknown function (CHP02336) |
| CHP02443 | PF09526 | 38 | 85 | 63 aa | 43% |   | Probable metal-binding protein (CHP02443) |
| CHP02444 | PF09523 | 47 | 62 | 107 aa | 31% |   | Protein of unknown function (CHP02444) |
| CHP02448 | PF09498 | 29 | 67 | 95 aa | 44% |   | Protein of unknown function (CHP02448) |
| CHP02450_Tryp | PF09493 | 46 | 67 | 60 aa | 32% |   | Tryptophan-rich protein (CHP02450_Tryp) |
| CHP02453 | PF09365 | 39 | 106 | 202 aa | 28% |   | Conserved hypothetical protein CHP02453 |
| CHP02569_actnb | PF09616 | 6 | 21 | 149 aa | 63% |   | Conserved protein of unknown function (CHP02569_actnb) |
| CHP02587 | PF09622 | 9 | 11 | 270 aa | 39% |   | Putative integral membrane protein (CHP02587) |
| CHP02588 | PF09624 | 9 | 11 | 118 aa | 32% |   | Protein of unknown function (CHP02588) |
| CHP02611 | PF09656 | 24 | 38 | 53 aa | 40% |   | Putative transmembrane protein (CHP02611) |
| CHP02647 | PF09653 | 22 | 36 | 75 aa | 50% |   | Protein of unknown function (CHP02647) |
| CHP02652 | PF09654 | 7 | 13 | 161 aa | 70% |   | Protein of unknown function (CHP02652) |
| CHP02677 | PF09660 | 15 | 20 | 431 aa | 26% |   | Protein of unknown function (CHP02677) |
| CHP02678 | PF09661 | 15 | 18 | 381 aa | 26% |   | Protein of unknown function (CHP02678) |
| CHP02679 | PF09664 | 13 | 19 | 340 aa | 27% |   | Protein of unknown function (CHP02679) |
| CHP02757 | PF09674 | 26 | 40 | 219 aa | 36% |   | Protein of unknown function (CHP02757) |
| CHP02922 | PF09558 | 6 | 13 | 70 aa | 71% |   | Protein of unknown function (CHP02922) |
| CHP1606_PLAF3D7 | PF09688 | 4 | 6 | 127 aa | 29% |   | Protein of unknown function (CHP1606_PLAF3D7) |
| CHP2216_phage | PF09550 | 23 | 25 | 43 aa | 45% |   | Conserved hypothetical phage protein (CHP2216_phage) |
| CHP2217 | PF09343 | 15 | 56 | 195 aa | 40% |   | Conserved hypothetical protein 2217 |
| CHP2241_phage | PF09540 | 65 | 90 | 138 aa | 27% |   | Putative phage tail protein (CHP2241_phage) |
| CHP2271_C | PF09557 | 42 | 56 | 114 aa | 31% |   | Domain of unknown function (CHP2271_C) |
| CHP2284 | PF09537 | 46 | 60 | 110 aa | 29% |   | Protein of unknown function (CHP2284) |
| CHP2293 | PF09722 | 25 | 96 | 107 aa | 28% |   | Protein of unknown function (CHP2293) |
| Chp_urease_rgn | PF09601 | 22 | 28 | 169 aa | 29% |   | Protein of unknown function (Chp_urease_rgn) |
| CHRD | PF07452 | 27 | 150 | 114 aa | 22% |   | CHRD domain |
| Chromadorea_ALT | PF05535 | 6 | 20 | 72 aa | 64% |   | Chromadorea ALT protein |
| Chromate_transp | PF02417 | 9 | 690 | 169 aa | 25% |   | Chromate transporter |
| Chromo | PF00385 | 178 | 1612 | 51 aa | 31% | 1ap0 | 'chromo' (CHRromatin Organisation MOdifier) domain |
| Chromo_shadow | PF01393 | 11 | 92 | 55 aa | 54% | 1e0b | Chromo shadow domain |
| Churchill | PF06573 | 3 | 11 | 111 aa | 72% |   | Churchill protein |
| ChW | PF07538 | 87 | 219 | 36 aa | 43% |   | Clostridial hydrophobic W |
| CHZ | PF09649 | 24 | 25 | 36 aa | 41% |   | Histone chaperone domain CHZ |
| CI-B14_5a | PF07347 | 2 | 20 | 93 aa | 58% |   | NADH:ubiquinone oxidoreductase subunit B14.5a (Complex I-B14.5a) |
| CIA30 | PF08547 | 46 | 155 | 171 aa | 24% |   | Complex I intermediate-associated protein 30 (CIA30) |
| CIDE-N | PF02017 | 7 | 80 | 76 aa | 38% | 1f2r | CIDE-N domain |
| cIII | PF08134 | 3 | 3 | 44 aa | 100% |   | cIII protein family |
| CIMR | PF00878 | 12 | 340 | 127 aa | 29% | 1e6f | Cation-independent mannose-6-phosphate receptor repeat |
| CinA | PF02464 | 12 | 538 | 150 aa | 37% |   | Competence-damaged protein |
| Circo_coat | PF04162 | 22 | 112 | 332 aa | 92% |   | Circovirus coat protein (VP1) |
| Circo_ORF2 | PF02443 | 2 | 317 | 219 aa | 61% |   | Circovirus ORF-2 protein |
| Circo_VP2 | PF04861 | 12 | 58 | 168 aa | 95% |   | Circovirus VP2 protein |
| Cir_Bir_Yir | PF06022 | 7 | 1113 | 263 aa | 35% |   | Plasmodium variant antigen protein Cir/Yir/Bir |
| CitD | PF04953 | 8 | 68 | 94 aa | 46% |   | Citrate lyase, gamma subunit |
| CITED | PF04487 | 7 | 36 | 176 aa | 42% | 1p4q | CITED |
| CitF | PF04223 | 5 | 82 | 440 aa | 59% |   | Citrate lyase, alpha subunit (CitF) |
| CitG | PF01874 | 12 | 177 | 256 aa | 29% |   | ATP:dephospho-CoA triphosphoribosyl transferase |
| CitMHS | PF03600 | 32 | 1084 | 406 aa | 15% |   | Citrate transporter |
| Citrate_ly_lig | PF08218 | 15 | 72 | 176 aa | 47% |   | Citrate lyase ligase C-terminal domain |
| Citrate_synt | PF00285 | 20 | 1773 | 275 aa | 43% | 1csc | Citrate synthase |
| Citrus_P18 | PF05520 | 3 | 40 | 157 aa | 96% |   | Citrus tristeza virus P18 protein |
| CitX | PF03802 | 6 | 68 | 160 aa | 35% |   | Apo-citrate lyase phosphoribosyl-dephospho-CoA transferase |
| CKS | PF01111 | 7 | 106 | 74 aa | 56% | 1cks | Cyclin-dependent kinase regulatory subunit |
| CK_II_beta | PF01214 | 7 | 207 | 165 aa | 44% | 1qf8 | Casein kinase II regulatory subunit |
| CLAG | PF03805 | 2 | 41 | 816 aa | 44% |   | Cytoadherence-linked asexual protein |
| Clathrin | PF00637 | 63 | 660 | 137 aa | 16% | 1b89 | Region in Clathrin and VPS |
| Clathrin-link | PF09268 | 5 | 51 | 24 aa | 57% | 1utc | Clathrin, heavy-chain linker |
| Clathrin_lg_ch | PF01086 | 3 | 76 | 182 aa | 41% |   | Clathrin light chain |
| Clathrin_propel | PF01394 | 71 | 490 | 36 aa | 15% | 1bpo | Clathrin propeller repeat |
| Clat_adaptor_s | PF01217 | 7 | 505 | 140 aa | 30% | 1gw5 | Clathrin adaptor complex small chain |
| Clavanin | PF05452 | 2 | 6 | 70 aa | 83% |   | Clavanin |
| Clc-like | PF07062 | 7 | 16 | 212 aa | 34% |   | Clc-like |
| CLCA_N | PF08434 | 10 | 46 | 252 aa | 61% |   | Calcium-activated chloride channel |
| Cleaved_Adhesin | PF07675 | 9 | 62 | 168 aa | 56% |   | Cleaved Adhesin Domain |
| Clenterotox | PF03505 | 4 | 28 | 147 aa | 49% |   | Clostridium enterotoxin |
| CLN3 | PF02487 | 5 | 80 | 330 aa | 37% |   | CLN3 protein |
| Cloacin | PF03515 | 4 | 14 | 213 aa | 54% | 1jch | Cloacin |
| Cloacin_immun | PF03513 | 3 | 10 | 78 aa | 68% | 3eip | Cloacin immunity protein |
| Closter_coat | PF01785 | 11 | 537 | 154 aa | 34% |   | Closterovirus coat protein |
| Clostridium_P47 | PF06597 | 4 | 18 | 288 aa | 45% |   | Clostridium P-47 protein |
| Clp1 | PF06807 | 5 | 62 | 170 aa | 34% |   | Pre-mRNA cleavage complex II protein Clp1 |
| ClpS | PF02617 | 52 | 432 | 80 aa | 36% | 1mbx | ATP-dependent Clp protease adaptor protein ClpS |
| CLPTM1 | PF05602 | 8 | 84 | 487 aa | 37% |   | Cleft lip and palate transmembrane protein 1 (CLPTM1) |
| Clp_N | PF02861 | 167 | 2489 | 51 aa | 24% | 1mbx | Clp amino terminal domain |
| CLP_protease | PF00574 | 88 | 1236 | 172 aa | 43% | 1tyf | Clp protease |
| Clusterin | PF01093 | 5 | 47 | 341 aa | 44% |   | Clusterin |
| CM1 | PF03026 | 2 | 129 | 218 aa | 100% |   | Influenza C virus M1 protein |
| CM2 | PF03021 | 2 | 109 | 139 aa | 98% |   | Influenza C virus M2 protein |
| CMAS | PF02353 | 12 | 595 | 270 aa | 36% | 1kpi | Cyclopropane-fatty-acyl-phospholipid synthase |
| CmcH_NodU | PF02543 | 11 | 165 | 341 aa | 33% |   | Carbamoyltransferase |
| CmcI | PF04989 | 4 | 50 | 233 aa | 33% |   | Cephalosporin hydroxylase |
| CMD | PF02627 | 217 | 1628 | 83 aa | 20% | 1knc | Carboxymuconolactone decarboxylase family |
| CMV_US | PF08001 | 4 | 31 | 212 aa | 39% |   | CMV US |
| Cmyb_C | PF09316 | 12 | 65 | 154 aa | 50% |   | C-myb, C-terminal |
| CM_1 | PF07736 | 4 | 84 | 115 aa | 43% | 1fnj | Chorismate mutase type I |
| CM_2 | PF01817 | 102 | 738 | 78 aa | 25% | 1csm | Chorismate mutase type II |
| Cm_res_leader | PF08077 | 2 | 3 | 16 aa | 84% |   | Chloramphenicol resistance gene leader peptide |
| Cna_B | PF05738 | 135 | 2010 | 65 aa | 24% | 1d2o | Cna protein B-type domain |
| CNF1 | PF05785 | 4 | 19 | 275 aa | 41% | 1hzg | Rho-activating domain of cytotoxic necrotizing factor |
| CNH | PF00780 | 22 | 233 | 269 aa | 20% |   | CNH domain |
| Cnl2_NKP2 | PF09447 | 11 | 16 | 66 aa | 42% |   | Cnl2/NKP2 family protein |
| cNMP_binding | PF00027 | 351 | 5773 | 90 aa | 18% | 1cgp | Cyclic nucleotide-binding domain |
| CNP1 | PF08750 | 10 | 38 | 147 aa | 39% |   | CNP1-like family |
| CNPase | PF05881 | 5 | 18 | 365 aa | 56% | 1n4t | 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNP or CNPase) |
| CNTF | PF01110 | 2 | 9 | 184 aa | 77% | 1cnt | Ciliary neurotrophic factor |
| CN_hydrolase | PF00795 | 48 | 2367 | 176 aa | 20% | 1ems | Carbon-nitrogen hydrolase |
| CoaE | PF01121 | 13 | 650 | 176 aa | 33% | 1jjv | Dephospho-CoA kinase |
| Coagulase | PF08764 | 11 | 68 | 227 aa | 45% | 1nu9 | Staphylococcus aureus coagulase |
| Coagulin | PF02035 | 2 | 4 | 173 aa | 78% | 1aoc | Coagulin |
| Coatamer_beta_C | PF07718 | 11 | 94 | 260 aa | 41% |   | Coatamer beta C-terminal region |
| Coatomer_E | PF04733 | 7 | 75 | 270 aa | 33% |   | Coatomer epsilon subunit |
| Coatomer_WDAD | PF04053 | 14 | 180 | 385 aa | 29% |   | Coatomer WD associated region |
| Coat_F | PF07875 | 17 | 79 | 65 aa | 25% |   | Coat F domain |
| Coat_X | PF07552 | 12 | 41 | 59 aa | 40% |   | Spore Coat Protein X and V domain |
| CoA_binding | PF02629 | 62 | 1463 | 95 aa | 27% | 1cqi | CoA binding domain |
| CoA_trans | PF01144 | 43 | 1232 | 205 aa | 26% | 1poi | Coenzyme A transferase |
| CoA_transf_3 | PF02515 | 17 | 1676 | 174 aa | 32% | 1p5r | CoA-transferase family III |
| Cobalamin_bind | PF01122 | 5 | 34 | 374 aa | 40% |   | Eukaryotic cobalamin-binding protein |
| CobA_CobO_BtuR | PF02572 | 3 | 425 | 174 aa | 38% | 1g64 | ATP:corrinoid adenosyltransferase BtuR/CobO/CobP |
| CobD_Cbib | PF03186 | 14 | 358 | 306 aa | 30% |   | CobD/Cbib protein |
| Cobl | PF09469 | 4 | 20 | 285 aa | 52% |   | Cordon-bleu domain |
| CobN-Mg_chel | PF02514 | 19 | 374 | 892 aa | 31% |   | CobN/Magnesium Chelatase |
| COBRA1 | PF06209 | 3 | 20 | 420 aa | 59% |   | Cofactor of BRCA1 (COBRA1) |
| CobS | PF02654 | 8 | 346 | 237 aa | 27% |   | Cobalamin-5-phosphate synthase |
| CobT | PF06213 | 10 | 88 | 546 aa | 43% |   | Cobalamin biosynthesis protein CobT |
| CobU | PF02283 | 5 | 299 | 169 aa | 39% | 1cbu | Cobinamide kinase / cobinamide phosphate guanyltransferase |
| cobW | PF02492 | 62 | 1486 | 176 aa | 28% | 1nij | CobW/HypB/UreG, nucleotide-binding domain |
| CobW_C | PF07683 | 108 | 805 | 100 aa | 24% | 1nij | Cobalamin synthesis protein cobW C-terminal domain |
| Cob_adeno_trans | PF01923 | 37 | 349 | 165 aa | 38% | 1nog | Cobalamin adenosyltransferase |
| CodY | PF06018 | 17 | 94 | 176 aa | 47% |   | CodY GAF-like domain |
| COesterase | PF00135 | 126 | 1678 | 419 aa | 25% | 1acj | Carboxylesterase |
| Cofilin_ADF | PF00241 | 16 | 456 | 123 aa | 21% | 2prf | Cofilin/tropomyosin-type actin-binding protein |
| COG2 | PF06148 | 4 | 34 | 559 aa | 36% |   | COG (conserved oligomeric Golgi) complex component, COG2 |
| COG4 | PF08318 | 15 | 54 | 308 aa | 29% |   | COG4 transport protein |
| COG6 | PF06419 | 6 | 60 | 523 aa | 31% |   | Conserved oligomeric complex COG6 |
| Cohesin | PF00963 | 42 | 172 | 142 aa | 24% | 1anu | Cohesin domain |
| CoiA | PF06054 | 14 | 100 | 291 aa | 26% |   | Competence protein CoiA-like family |
| Coiled | PF05710 | 2 | 54 | 80 aa | 47% |   | Coiled coil |
| Coleoptericin | PF06286 | 3 | 10 | 118 aa | 54% |   | Coleoptericin |
| COLFI | PF01410 | 12 | 245 | 190 aa | 48% |   | Fibrillar collagen C-terminal domain |
| Colicin | PF01024 | 9 | 48 | 187 aa | 41% | 1col | Colicin pore forming domain |
| ColicinD | PF09204 | 3 | 9 | 80 aa | 50% | 1v74 | Colicin D |
| Colicin_im | PF03857 | 5 | 6 | 136 aa | 40% |   | Colicin immunity protein |
| Colicin_Pyocin | PF01320 | 6 | 63 | 86 aa | 49% | 1cei | Colicin immunity protein / pyocin immunity protein |
| Colicin_V | PF02674 | 18 | 451 | 154 aa | 22% |   | Colicin V production protein |
| Colipase | PF01114 | 5 | 16 | 39 aa | 70% | 1lpb | Colipase, N-terminal domain |
| Colipase_C | PF02740 | 5 | 16 | 44 aa | 81% | 1lpb | Colipase, C-terminal domain |
| Collagen | PF01391 | 41 | 9194 | 53 aa | 41% | 1a9a | Collagen triple helix repeat (20 copies) |
| Collagen_bind | PF05737 | 15 | 145 | 134 aa | 20% | 1amx | Collagen binding domain |
| Collar | PF07484 | 37 | 275 | 53 aa | 36% | 1ocy | Phage Tail Collar Domain |
| Col_cuticle_N | PF01484 | 55 | 300 | 61 aa | 21% |   | Nematode cuticle collagen N-terminal domain |
| ComA | PF02679 | 7 | 52 | 243 aa | 32% | 1qwg | (2R)-phospho-3-sulfolactate synthase (ComA) |
| ComC | PF03047 | 12 | 32 | 43 aa | 52% |   | COMC family |
| ComK | PF06338 | 5 | 73 | 166 aa | 37% |   | ComK protein |
| Como_LCP | PF02247 | 10 | 56 | 337 aa | 42% | 1bmv | Large coat protein |
| Como_SCP | PF02248 | 10 | 21 | 177 aa | 48% | 1bmv | Small coat protein |
| Competence | PF03772 | 31 | 510 | 262 aa | 22% |   | Competence protein |
| Complex1_24kDa | PF01257 | 5 | 592 | 149 aa | 33% |   | Respiratory-chain NADH dehydrogenase 24 Kd subunit |
| Complex1_30kDa | PF00329 | 57 | 747 | 68 aa | 42% |   | Respiratory-chain NADH dehydrogenase, 30 Kd subunit |
| Complex1_49kDa | PF00346 | 7 | 883 | 222 aa | 38% |   | Respiratory-chain NADH dehydrogenase, 49 Kd subunit |
| Complex1_51K | PF01512 | 19 | 839 | 248 aa | 39% |   | Respiratory-chain NADH dehydrogenase 51 Kd subunit |
| Complex1_LYR | PF05347 | 20 | 214 | 64 aa | 23% |   | Complex 1 protein (LYR family) |
| ComX | PF05952 | 8 | 19 | 50 aa | 40% |   | Bacillus competence pheromone ComX |
| Condensation | PF00668 | 42 | 3693 | 272 aa | 21% | 1l5a | Condensation domain |
| Connexin | PF00029 | 16 | 346 | 115 aa | 47% |   | Connexin |
| Connexin43 | PF03508 | 2 | 40 | 20 aa | 92% |   | Gap junction alpha-1 protein (Cx43) |
| Connexin50 | PF03509 | 4 | 13 | 67 aa | 73% |   | Gap junction alpha-8 protein (Cx50) |
| Conotoxin | PF02950 | 123 | 483 | 67 aa | 23% | 2cco | Conotoxin |
| Cons_hypoth698 | PF03601 | 13 | 368 | 292 aa | 29% |   | Conserved hypothetical protein 698 |
| Cons_hypoth95 | PF03602 | 28 | 685 | 169 aa | 28% |   | Conserved hypothetical protein 95 |
| CopB | PF05275 | 9 | 109 | 243 aa | 41% |   | Copper resistance protein B precursor (CopB) |
| CopC | PF04234 | 12 | 218 | 120 aa | 29% | 1ix2 | Copper resistance protein CopC |
| CopD | PF05425 | 12 | 216 | 287 aa | 23% |   | Copper resistance protein D |
| Copine | PF07002 | 20 | 185 | 141 aa | 43% |   | Copine |
| COPI_assoc | PF08507 | 9 | 34 | 131 aa | 28% |   | COPI associated protein |
| COPI_C | PF06957 | 5 | 92 | 378 aa | 36% |   | Coatomer (COPI) alpha subunit C-terminus |
| Copper-bind | PF00127 | 31 | 441 | 87 aa | 30% | 1plc | Copper binding proteins, plastocyanin/azurin family |
| Copper-fist | PF00649 | 9 | 38 | 40 aa | 55% | 1co4 | Copper fist DNA binding domain |
| Coprinus_mating | PF05920 | 9 | 29 | 558 aa | 36% |   | Coprinus cinereus mating-type protein |
| Coprogen_oxidas | PF01218 | 5 | 350 | 294 aa | 48% |   | Coproporphyrinogen III oxidase |
| Coq4 | PF05019 | 5 | 63 | 198 aa | 38% |   | Coenzyme Q (ubiquinone) biosynthesis protein Coq4 |
| COQ7 | PF03232 | 11 | 172 | 86 aa | 28% |   | Ubiquinone biosynthesis protein COQ7 |
| COQ9 | PF08511 | 21 | 85 | 78 aa | 36% |   | COQ9 |
| Cor1 | PF04803 | 5 | 55 | 120 aa | 31% |   | Cor1/Xlr/Xmr conserved region |
| CorA | PF01544 | 25 | 977 | 293 aa | 17% |   | CorA-like Mg2+ transporter protein |
| CorC_HlyC | PF03471 | 74 | 1341 | 79 aa | 23% |   | Transporter associated domain |
| Cornichon | PF03311 | 9 | 95 | 125 aa | 42% |   | Cornichon protein |
| Cornifin | PF02389 | 5 | 34 | 123 aa | 39% |   | Cornifin (SPRR) family |
| Coronavirus_5 | PF05528 | 2 | 35 | 82 aa | 90% |   | Coronavirus gene 5 protein |
| Coronavirus_NS4 | PF05780 | 4 | 36 | 74 aa | 66% |   | Coronavirus nonstructural protein 4 |
| Corona_3 | PF04694 | 2 | 27 | 57 aa | 87% |   | Coronavirus ORF3 protein |
| Corona_5a | PF06336 | 2 | 27 | 63 aa | 86% |   | Coronavirus 5a protein |
| Corona_6B_7B | PF03262 | 2 | 60 | 203 aa | 83% |   | Coronavirus 6B/7B protein |
| Corona_7 | PF02398 | 2 | 39 | 90 aa | 83% |   | Coronavirus protein 7 |
| Corona_I | PF03187 | 3 | 32 | 199 aa | 59% |   | Corona nucleocapsid I protein |
| Corona_M | PF01635 | 5 | 269 | 199 aa | 42% |   | Coronavirus M matrix/glycoprotein |
| Corona_NS1 | PF06145 | 8 | 11 | 29 aa | 92% |   | Coronavirus nonstructural protein NS1 |
| Corona_NS2 | PF04753 | 2 | 33 | 107 aa | 72% |   | Coronavirus non-structural protein NS2 |
| Corona_NS2A | PF05213 | 2 | 24 | 240 aa | 62% |   | Coronavirus NS2A protein |
| Corona_NS3b | PF03053 | 2 | 54 | 199 aa | 56% |   | ORF3b coronavirus protein |
| Corona_NS4 | PF03905 | 2 | 19 | 48 aa | 70% |   | Coronavirus non-structural protein NS4 |
| Corona_nucleoca | PF00937 | 9 | 373 | 339 aa | 38% |   | Coronavirus nucleocapsid protein |
| Corona_RPol_N | PF06478 | 5 | 150 | 342 aa | 65% |   | Coronavirus RPol N-terminus |
| Corona_S1 | PF01600 | 8 | 928 | 345 aa | 49% |   | Coronavirus S1 glycoprotein |
| Corona_S2 | PF01601 | 8 | 500 | 466 aa | 38% |   | Coronavirus S2 glycoprotein |
| Cortex-I_coil | PF09304 | 7 | 7 | 107 aa | 55% |   | Cortexillin I, coiled coil |
| CotH | PF08757 | 16 | 82 | 329 aa | 20% |   | CotH protein |
| COX1 | PF00115 | 23 | 46020 | 232 aa | 50% | 1occ | Cytochrome C and Quinol oxidase polypeptide I |
| COX15-CtaA | PF02628 | 6 | 385 | 315 aa | 24% |   | Cytochrome oxidase assembly protein |
| COX17 | PF05051 | 7 | 59 | 62 aa | 43% |   | Cytochrome C oxidase copper chaperone (COX17) |
| COX2 | PF00116 | 32 | 12470 | 103 aa | 56% | 1occ | Cytochrome C oxidase subunit II, periplasmic domain |
| COX2-transmemb | PF09125 | 2 | 2 | 38 aa | 100% | 1ehk | Cytochrome C oxidase subunit II, transmembrane |
| COX2_TM | PF02790 | 32 | 10903 | 76 aa | 52% | 1occ | Cytochrome C oxidase subunit II, transmembrane domain |
| COX3 | PF00510 | 21 | 3955 | 203 aa | 51% | 1occ | Cytochrome c oxidase subunit III |
| COX4 | PF02936 | 10 | 94 | 129 aa | 34% | 2occ | Cytochrome c oxidase subunit IV |
| COX4_pro | PF03626 | 17 | 233 | 86 aa | 38% | 1occ | Prokaryotic Cytochrome C oxidase subunit IV |
| COX4_pro_2 | PF07835 | 7 | 41 | 45 aa | 34% | 1qle | Bacterial aa3 type cytochrome c oxidase subunit IV |
| COX5A | PF02284 | 3 | 65 | 93 aa | 51% | 2occ | Cytochrome c oxidase subunit Va |
| COX5B | PF01215 | 4 | 92 | 84 aa | 40% | 1occ | Cytochrome c oxidase subunit Vb |
| COX5C | PF05799 | 6 | 14 | 59 aa | 71% |   | Cytochrome c oxidase subunit Vc (COX5C) |
| COX6A | PF02046 | 6 | 69 | 90 aa | 41% | 2occ | Cytochrome c oxidase subunit VIa |
| COX6B | PF02297 | 3 | 70 | 72 aa | 52% | 2occ | Cytochrome oxidase c subunit VIb |
| COX6C | PF02937 | 4 | 31 | 71 aa | 53% | 2occ | Cytochrome c oxidase subunit VIc |
| COX7a | PF02238 | 8 | 73 | 50 aa | 46% | 1occ | Cytochrome c oxidase subunit VIIa |
| COX7B | PF05392 | 4 | 14 | 79 aa | 63% | 1ocz | Cytochrome C oxidase chain VIIB |
| COX7C | PF02935 | 4 | 45 | 61 aa | 49% | 2occ | Cytochrome c oxidase subunit VIIc |
| COX8 | PF02285 | 6 | 39 | 43 aa | 57% | 1occ | Cytochrome oxidase c subunit VIII |
| COX9 | PF09576 | 12 | 17 | 57 aa | 47% |   | Cytochrome c oxidase subunit COX9 |
| COXG | PF06240 | 15 | 176 | 140 aa | 26% |   | Carbon monoxide dehydrogenase subunit G (CoxG) |
| CoxIIa | PF08113 | 2 | 2 | 34 aa | 100% |   | Cytochrome c oxidase subunit IIa family |
| COX_ARM | PF06481 | 28 | 192 | 47 aa | 31% | 1cyw | COX Aromatic Rich Motif |
| CO_deh_flav_C | PF03450 | 17 | 677 | 94 aa | 31% | 1fo4 | CO dehydrogenase flavoprotein C-terminal domain |
| CO_dh | PF02552 | 6 | 30 | 156 aa | 33% |   | CO dehydrogenase beta subunit/acetyl-CoA synthase epsilon subunit |
| CP12 | PF02672 | 4 | 80 | 55 aa | 45% |   | CP12 domain |
| CP2 | PF04516 | 8 | 84 | 214 aa | 38% |   | CP2 transcription factor |
| CpcD | PF01383 | 22 | 151 | 55 aa | 34% | 1b33 | CpcD/allophycocyanin linker domain |
| CPDase | PF07823 | 15 | 20 | 201 aa | 23% |   | Cyclic phosphodiesterase-like protein |
| CpeS | PF09367 | 35 | 78 | 165 aa | 29% |   | CpeS-like protein |
| CPL | PF08144 | 4 | 21 | 130 aa | 37% |   | CPL (NUC119) domain |
| Cpl-7 | PF08230 | 5 | 17 | 40 aa | 49% |   | Cpl-7 lysozyme C-terminal domain |
| Cpn10 | PF00166 | 48 | 1156 | 87 aa | 43% | 1lep | Chaperonin 10 Kd subunit |
| Cpn60_TCP1 | PF00118 | 40 | 6001 | 293 aa | 38% | 1grl | TCP-1/cpn60 chaperonin family |
| Cps15 | PF05205 | 2 | 5 | 125 aa | 37% |   | Chromatin remodelling complex component cps15 |
| CPSase_L_chain | PF00289 | 18 | 3127 | 114 aa | 31% | 1bnc | Carbamoyl-phosphate synthase L chain, N-terminal domain |
| CPSase_L_D2 | PF02786 | 16 | 3385 | 192 aa | 31% | 1bnc | Carbamoyl-phosphate synthase L chain, ATP binding domain |
| CPSase_L_D3 | PF02787 | 40 | 847 | 119 aa | 38% | 1bnc | Carbamoyl-phosphate synthetase large chain, oligomerisation domain |
| CPSase_sm_chain | PF00988 | 24 | 1070 | 133 aa | 42% | 1jdb | Carbamoyl-phosphate synthase small chain, CPSase domain |
| CPSF_A | PF03178 | 14 | 198 | 292 aa | 22% |   | CPSF A subunit region |
| CPT | PF07931 | 7 | 21 | 167 aa | 31% | 1grq | Chloramphenicol phosphotransferase-like protein |
| CPW_WPC | PF09717 | 45 | 140 | 57 aa | 30% |   | Plasmodium falciparum domain of unknown function (CPW_WPC) |
| CRA | PF06589 | 3 | 18 | 134 aa | 79% |   | Circumsporozoite-related antigen (CRA) |
| CRAL_TRIO | PF00650 | 15 | 706 | 140 aa | 21% | 1aua | CRAL/TRIO domain |
| CRAL_TRIO_N | PF03765 | 14 | 387 | 71 aa | 27% | 1aua | CRAL/TRIO, N-terminus |
| CRAM_rpt | PF07016 | 2 | 73 | 24 aa | 96% |   | Cysteine-rich, acidic integral membrane protein precursor (CRAM) repeat |
| CRA_rpt | PF07046 | 3 | 73 | 41 aa | 88% |   | Cytoplasmic repetitive antigen (CRA) like repeat |
| CRCB | PF02537 | 12 | 653 | 114 aa | 31% |   | CrcB-like protein |
| CRC_subunit | PF08624 | 15 | 38 | 101 aa | 50% |   | Chromatin remodelling complex subunit |
| CreA | PF05981 | 9 | 147 | 145 aa | 43% |   | CreA protein |
| Creatinase_N | PF01321 | 29 | 872 | 110 aa | 22% | 1chm | Creatinase/Prolidase N-terminal domain |
| Creatininase | PF02633 | 5 | 238 | 243 aa | 25% | 1v7z | Creatinine amidohydrolase |
| Creb_binding | PF09030 | 4 | 16 | 101 aa | 59% |   | Creb binding |
| CreD | PF06123 | 10 | 84 | 415 aa | 35% |   | Inner membrane protein CreD |
| CRF | PF00473 | 7 | 73 | 39 aa | 51% | 1goe | Corticotropin-releasing factor family |
| CRF-BP | PF05428 | 3 | 28 | 266 aa | 52% |   | Corticotropin-releasing factor binding protein (CRF-BP) |
| Crinivirus_P26 | PF07416 | 2 | 5 | 227 aa | 99% |   | Crinivirus P26 protein |
| Crisp | PF08562 | 26 | 83 | 52 aa | 52% |   | Crisp |
| CRISPR_assoc | PF08798 | 20 | 66 | 221 aa | 26% |   | CRISPR associated protein |
| CRISPR_Cse1 | PF09481 | 47 | 60 | 465 aa | 21% |   | CRISPR-associated protein Cse1 (CRISPR_cse1) |
| CRISPR_Cse2 | PF09485 | 53 | 64 | 143 aa | 21% |   | CRISPR-associated protein Cse2 (CRISPR_cse2) |
| Crl | PF07417 | 4 | 37 | 128 aa | 54% |   | Transcriptional regulator Crl |
| CRM1_C | PF08767 | 14 | 90 | 281 aa | 38% |   | CRM1 C terminal |
| Cro | PF09048 | 5 | 7 | 59 aa | 59% |   | Cro |
| Crp | PF00325 | 12 | 1189 | 31 aa | 33% | 1cgp | Bacterial regulatory proteins, crp family |
| CRPA | PF05745 | 5 | 11 | 134 aa | 51% |   | Chlamydia 15 kDa cysteine-rich outer membrane protein (CRPA) |
| CRPV_capsid | PF08762 | 7 | 49 | 174 aa | 37% | 1b35 | CRPV capsid protein like |
| CRS1_YhbY | PF01985 | 52 | 414 | 83 aa | 31% | 1jo0 | CRS1 / YhbY domain |
| CRT-like | PF08627 | 3 | 5 | 124 aa | 66% |   | CRT-like |
| CRT10 | PF08728 | 7 | 7 | 705 aa | 20% |   | CRT10 |
| CrtC | PF07143 | 7 | 41 | 282 aa | 34% |   | Hydroxyneurosporene synthase (CrtC) |
| Crust_neurohorm | PF01147 | 10 | 168 | 68 aa | 43% | 1j0t | Crustacean CHH/MIH/GIH neurohormone family |
| Crust_neuro_H | PF03858 | 2 | 32 | 39 aa | 61% |   | Crustacean neurohormone H |
| CryBP1 | PF07029 | 3 | 18 | 155 aa | 46% |   | CryBP1 protein |
| Crystall | PF00030 | 37 | 635 | 79 aa | 35% | 4gcr | Beta/Gamma crystallin |
| Crystallin | PF00525 | 13 | 119 | 54 aa | 67% |   | Alpha crystallin A chain, N terminal |
| CS | PF04969 | 100 | 551 | 75 aa | 20% | 1rl1 | CS domain |
| CsbD | PF05532 | 21 | 392 | 52 aa | 33% | 1jyg | CsbD-like |
| CSD | PF00313 | 40 | 2172 | 66 aa | 43% | 1mjc | 'Cold-shock' DNA-binding domain |
| Cse1 | PF08506 | 15 | 64 | 285 aa | 37% |   | Cse1 |
| CSE2 | PF07544 | 5 | 28 | 83 aa | 31% |   | RNA polymerase II transcription mediator |
| CSF-1 | PF05337 | 7 | 32 | 260 aa | 41% |   | Macrophage colony stimulating factor-1 (CSF-1) |
| CsgG | PF03783 | 6 | 113 | 220 aa | 30% |   | Curli production assembly/transport component CsgG |
| CsiD | PF08943 | 9 | 27 | 295 aa | 65% |   | CsiD |
| CsoSCA | PF08936 | 13 | 35 | 458 aa | 56% |   | Carboxysome Shell Carbonic Anhydrase |
| CsrA | PF02599 | 33 | 254 | 60 aa | 52% |   | Global regulator protein family |
| CST-I | PF06002 | 3 | 33 | 267 aa | 66% | 1ro8 | Alpha-2,3-sialyltransferase (CST-I) |
| CstA | PF02554 | 7 | 317 | 378 aa | 42% |   | Carbon starvation protein CstA |
| CT20 | PF07904 | 9 | 33 | 93 aa | 33% |   | CT20 family |
| CtaG_Cox11 | PF04442 | 13 | 246 | 142 aa | 40% |   | Cytochrome c oxidase assembly protein CtaG / Cox11 |
| Ctf8 | PF09696 | 26 | 35 | 123 aa | 29% |   | Ctf8 |
| CTF_NFI | PF00859 | 3 | 102 | 220 aa | 58% |   | CTF/NF-I family transcription modulation region |
| CTI | PF06934 | 6 | 52 | 683 aa | 48% |   | Fatty acid cis/trans isomerase (CTI) |
| CtnDOT_TraJ | PF07863 | 7 | 22 | 65 aa | 49% |   | Homologues of TraJ from Bacteroides conjugative transposon |
| CTNNB1_binding | PF08347 | 13 | 90 | 189 aa | 47% |   | N-terminal CTNNB1 binding |
| CTP_synth_N | PF06418 | 62 | 736 | 261 aa | 55% |   | CTP synthase N-terminus |
| CTP_transf_1 | PF01148 | 48 | 912 | 251 aa | 21% |   | Cytidylyltransferase family |
| CTP_transf_2 | PF01467 | 65 | 2025 | 133 aa | 20% | 1coz | Cytidylyltransferase |
| CTP_transf_3 | PF02348 | 20 | 687 | 183 aa | 28% | 1h7t | Cytidylyltransferase |
| Ctr | PF04145 | 21 | 209 | 141 aa | 23% |   | Ctr copper transporter family |
| CtsR | PF05848 | 11 | 104 | 149 aa | 47% |   | Firmicute transcriptional repressor of class III stress genes (CtsR) |
| CTV_P13 | PF06922 | 3 | 16 | 110 aa | 92% |   | Citrus tristeza virus P13 protein |
| CTV_P23 | PF04808 | 3 | 99 | 205 aa | 91% |   | Citrus tristeza virus (CTV) P23 protein |
| CTV_P33 | PF07184 | 2 | 113 | 203 aa | 88% |   | Citrus tristeza virus P33 protein |
| CTV_P6 | PF06706 | 2 | 9 | 51 aa | 94% |   | Citrus tristeza virus 6-kDa protein |
| CTX_RstB | PF07459 | 3 | 11 | 116 aa | 77% |   | CTX phage RstB protein |
| Cu-oxidase | PF00394 | 72 | 2869 | 137 aa | 38% | 1aoz | Multicopper oxidase |
| Cu-oxidase_2 | PF07731 | 128 | 1293 | 126 aa | 22% | 1aoz | Multicopper oxidase |
| Cu-oxidase_3 | PF07732 | 124 | 1875 | 88 aa | 35% | 1aoz | Multicopper oxidase |
| Cu2_monooxygen | PF01082 | 13 | 98 | 137 aa | 30% | 1phm | Copper type II ascorbate-dependent monooxygenase, N-terminal domain |
| Cu2_monoox_C | PF03712 | 11 | 99 | 144 aa | 33% | 1phm | Copper type II ascorbate-dependent monooxygenase, C-terminal domain |
| CUB | PF00431 | 29 | 1942 | 102 aa | 28% | 1sfp | CUB domain |
| CUB_2 | PF02408 | 29 | 81 | 114 aa | 21% |   | CUB-like domain |
| Cucumo_2B | PF03263 | 3 | 45 | 103 aa | 71% |   | Cucumovirus protein 2B |
| Cucumo_coat | PF00760 | 4 | 318 | 189 aa | 83% | 1f15 | Cucumovirus coat protein |
| CUE | PF02845 | 23 | 231 | 42 aa | 24% | 1otr | CUE domain |
| Cullin | PF00888 | 49 | 404 | 474 aa | 21% | 1ldj | Cullin family |
| Cupin_1 | PF00190 | 225 | 1157 | 142 aa | 19% | 2phl | Cupin |
| Cupin_2 | PF07883 | 156 | 2971 | 70 aa | 20% | 1vj2 | Cupin domain |
| Cupin_3 | PF05899 | 33 | 325 | 74 aa | 26% | 1o5u | Protein of unknown function (DUF861) |
| Cupin_4 | PF08007 | 26 | 243 | 288 aa | 29% |   | Cupin superfamily protein |
| Cupin_5 | PF06172 | 20 | 195 | 136 aa | 38% |   | Cupin superfamily (DUF985) |
| Curlin_rpt | PF07012 | 22 | 549 | 32 aa | 32% |   | Curlin associated repeat |
| Curto_V2 | PF07325 | 2 | 8 | 118 aa | 85% |   | Curtovirus V2 protein |
| Curto_V3 | PF07436 | 2 | 7 | 87 aa | 89% |   | Curtovirus V3 protein |
| CUT | PF02376 | 10 | 123 | 86 aa | 39% |   | CUT domain |
| Cut8 | PF08559 | 15 | 25 | 226 aa | 32% |   | Cut8 |
| CutA1 | PF03091 | 13 | 288 | 97 aa | 35% | 1p1l | CutA1 divalent ion tolerance protein |
| CutC | PF03932 | 8 | 212 | 199 aa | 37% |   | CutC family |
| Cuticle_1 | PF08140 | 16 | 46 | 38 aa | 48% |   | Crustacean cuticle protein repeat |
| Cuticle_2 | PF08184 | 3 | 3 | 59 aa | 96% |   | Cuticle protein 7 isoform family |
| Cutinase | PF01083 | 23 | 235 | 187 aa | 30% | 1cex | Cutinase |
| Cu_amine_oxid | PF01179 | 15 | 228 | 378 aa | 32% | 1oac | Copper amine oxidase, enzyme domain |
| Cu_amine_oxidN1 | PF07833 | 13 | 167 | 86 aa | 27% | 1spu | Copper amine oxidase N-terminal domain |
| Cu_amine_oxidN2 | PF02727 | 17 | 180 | 79 aa | 26% | 1oac | Copper amine oxidase, N2 domain |
| Cu_amine_oxidN3 | PF02728 | 18 | 158 | 100 aa | 22% | 1oac | Copper amine oxidase, N3 domain |
| Cu_bind_like | PF02298 | 26 | 248 | 78 aa | 34% | 2cbp | Plastocyanin-like domain |
| CVNH | PF08881 | 26 | 55 | 103 aa | 29% |   | CVNH domain |
| cwf18 | PF08315 | 8 | 44 | 144 aa | 31% |   | cwf18 pre-mRNA splicing factor |
| cwf21 | PF08312 | 21 | 63 | 47 aa | 40% |   | cwf21 |
| CwfJ_C_1 | PF04677 | 8 | 105 | 127 aa | 29% |   | Protein similar to CwfJ C-terminus 1 |
| CwfJ_C_2 | PF04676 | 8 | 92 | 92 aa | 29% |   | Protein similar to CwfJ C-terminus 2 |
| Cwf_Cwc_15 | PF04889 | 5 | 64 | 213 aa | 43% |   | Cwf15/Cwc15 cell cycle control protein |
| CW_binding_1 | PF01473 | 213 | 1825 | 19 aa | 42% | 1hcx | Putative cell wall binding repeat |
| CW_binding_2 | PF04122 | 12 | 403 | 86 aa | 29% |   | Putative cell wall binding repeat 2 |
| CX | PF01705 | 9 | 34 | 59 aa | 35% |   | CX module |
| CXC | PF03638 | 14 | 291 | 41 aa | 47% |   | Tesmin/TSO1-like CXC domain |
| CXCXC | PF03128 | 116 | 394 | 14 aa | 31% |   | CXCXC repeat |
| CxxC_CxxC_SSSS | PF09723 | 165 | 291 | 41 aa | 37% |   | Putative regulatory protein (CxxC_CxxC_SSSS) |
| Cyanate_lyase | PF02560 | 4 | 107 | 72 aa | 56% | 1dw9 | Cyanate lyase C-terminal domain |
| CybS | PF05328 | 8 | 62 | 144 aa | 31% |   | CybS |
| Cyc-maltodext_N | PF09087 | 10 | 25 | 89 aa | 36% | 1h3g | Cyclomaltodextrinase, N-terminal |
| Cyclase | PF04199 | 25 | 384 | 207 aa | 25% |   | Putative cyclase |
| Cyclase_polyket | PF04673 | 9 | 36 | 95 aa | 50% |   | Polyketide synthesis cyclase |
| Cyclin | PF08613 | 11 | 238 | 146 aa | 25% |   | Cyclin |
| Cyclin_C | PF02984 | 140 | 766 | 113 aa | 22% | 1vin | Cyclin, C-terminal domain |
| Cyclin_N | PF00134 | 133 | 1387 | 115 aa | 26% | 1vin | Cyclin, N-terminal domain |
| Cyclotide | PF03784 | 4 | 81 | 29 aa | 59% | 1kal | Cyclotide family |
| Cyd_oper_YbgE | PF09600 | 19 | 44 | 81 aa | 44% |   | Cyd operon protein YbgE (Cyd_oper_YbgE) |
| Cypo_polyhedrin | PF05865 | 2 | 12 | 248 aa | 96% |   | Cypovirus polyhedrin protein |
| Cystatin | PF00031 | 44 | 606 | 82 aa | 21% | 1cew | Cystatin domain |
| Cys_knot | PF00007 | 24 | 576 | 87 aa | 36% | 1hcn | Cystine-knot domain |
| Cys_Met_Meta_PP | PF01053 | 30 | 1785 | 370 aa | 34% | 1cs1 | Cys/Met metabolism PLP-dependent enzyme |
| Cys_rich_FGFR | PF00839 | 25 | 233 | 58 aa | 25% |   | Cysteine rich repeat |
| Cyt-b5 | PF00173 | 213 | 1287 | 81 aa | 27% | 3b5c | Cytochrome b5-like Heme/Steroid binding domain |
| Cytadhesin_P30 | PF07271 | 3 | 25 | 216 aa | 75% |   | Cytadhesin P30/P32 |
| CytB6-F_Fe-S | PF08802 | 15 | 72 | 37 aa | 45% |   | Cytochrome B6-F complex Fe-S subunit |
| CYTH | PF01928 | 56 | 489 | 179 aa | 20% |   | CYTH domain |
| Cytidylate_kin | PF02224 | 14 | 520 | 155 aa | 39% | 2cmk | Cytidylate kinase |
| Cytochrom_B558a | PF05038 | 4 | 21 | 177 aa | 74% |   | Cytochrome Cytochrome b558 alpha-subunit |
| Cytochrom_B559 | PF00283 | 8 | 780 | 28 aa | 54% |   | Cytochrome b559, alpha (gene psbE) and beta (gene psbF)subunits |
| Cytochrom_B559a | PF00284 | 14 | 405 | 39 aa | 83% |   | Lumenal portion of Cytochrome b559, alpha (gene psbE) subunit |
| Cytochrom_B561 | PF03188 | 11 | 144 | 198 aa | 26% |   | Cytochrome b561 |
| Cytochrom_B562 | PF07361 | 8 | 47 | 103 aa | 38% | 1qq3 | Cytochrome b562 |
| Cytochrom_B_C | PF00032 | 9 | 27866 | 88 aa | 75% | 1bcc | Cytochrome b(C-terminal)/b6/petD |
| Cytochrom_B_N | PF00033 | 8 | 43650 | 153 aa | 69% | 3bcc | Cytochrome b(N-terminal)/b6/petB |
| Cytochrom_C | PF00034 | 34 | 3008 | 83 aa | 21% | 1cry | Cytochrome c |
| Cytochrom_C1 | PF02167 | 14 | 306 | 212 aa | 34% | 3bcc | Cytochrome C1 family |
| Cytochrom_C552 | PF02335 | 3 | 124 | 398 aa | 41% | 1qdb | Cytochrome c552 |
| Cytochrom_CIII | PF02085 | 9 | 46 | 94 aa | 29% | 2cdv | Class III cytochrome C family |
| Cytochrom_C_2 | PF01322 | 15 | 128 | 121 aa | 29% | 1cgo | Cytochrome C' |
| Cytochrom_C_asm | PF01578 | 39 | 1255 | 207 aa | 22% |   | Cytochrome C assembly protein |
| Cytochrom_D1 | PF02239 | 8 | 2098 | 238 aa | 58% | 1nir | Cytochrome D1 heme domain |
| Cytochrom_NNT | PF03264 | 15 | 283 | 162 aa | 42% |   | NapC/NirT cytochrome c family, N-terminal region |
| CytoC_RC | PF02276 | 10 | 40 | 244 aa | 41% | 1prc | Photosynthetic reaction centre cytochrome C subunit |
| Cytokin-bind | PF09265 | 19 | 54 | 243 aa | 36% | 1w1o | Cytokinin dehydrogenase 1, FAD and cytokinin binding |
| Cytomega_gL | PF01801 | 5 | 37 | 260 aa | 55% |   | Cytomegalovirus glycoprotein L |
| Cytomega_TRL10 | PF06084 | 5 | 14 | 170 aa | 89% |   | Cytomegalovirus TRL10 protein |
| Cytomega_UL20A | PF05984 | 2 | 3 | 99 aa | 57% |   | Cytomegalovirus UL20A protein |
| Cytomega_UL84 | PF06284 | 4 | 9 | 528 aa | 70% |   | Cytomegalovirus UL84 protein |
| Cytomega_US3 | PF05963 | 2 | 29 | 177 aa | 87% |   | Cytomegalovirus US3 protein |
| Cytotoxic | PF09000 | 9 | 15 | 86 aa | 56% |   | Cytotoxic |
| Cyto_heme_lyase | PF01265 | 6 | 86 | 220 aa | 39% |   | Cytochrome c/c1 heme lyase |
| Cyto_ox_2 | PF02322 | 15 | 521 | 334 aa | 34% |   | Cytochrome oxidase subunit II |
| C_GCAxxG_C_C | PF09719 | 48 | 71 | 121 aa | 27% |   | Putative redox-active protein (C_GCAxxG_C_C) |
| C_tripleX | PF02363 | 168 | 1263 | 16 aa | 31% |   | Cysteine rich repeat |
Available sections: Numbers A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Top twenty families