| PF00037 | Fer4 | 4Fe-4S binding domain | A0A097ATG3 |
| PF00038 | Filament | Intermediate filament protein | P02545 |
| PF00039 | fn1 | Fibronectin type I domain | P02751 |
| PF00040 | fn2 | Fibronectin type II domain | Q13018 |
| PF00041 | fn3 | Fibronectin type III domain | P15208 |
| PF00111 | Fer2 | 2Fe-2S iron-sulfur cluster binding domain | P80457 |
| PF00142 | Fer4_NifH | 4Fe-4S iron sulfur cluster binding proteins, NifH/frxC family | P00459 |
| PF00147 | Fibrinogen_C | Fibrinogen beta and gamma chains, C-terminal globular domain | P55083 |
| PF00167 | FGF | Fibroblast growth factor | Q9NSA1 |
| PF00210 | Ferritin | Ferritin-like domain | P02791 |
| PF00250 | Forkhead | Forkhead domain | P70056 |
| PF00254 | FKBP_C | FKBP-type peptidyl-prolyl cis-trans isomerase | O08915 |
| PF00258 | Flavodoxin_1 | Flavodoxin | P10340 |
| PF00286 | Flexi_CP | Viral coat protein | Q52Z61 |
| PF00316 | FBPase | Fructose-1-6-bisphosphatase, N-terminal domain | P09467 |
| PF00370 | FGGY_N | FGGY family of carbohydrate kinases, N-terminal domain | A0A287BD08 |
| PF00373 | FERM_M | FERM central domain | P26038 |
| PF00419 | Fimbrial | Fimbrial protein | P08191 |
| PF00460 | Flg_bb_rod | Flagella basal body rod protein | A0A0F7J893 |
| PF00465 | Fe-ADH | Iron-containing alcohol dehydrogenase | Q8R612 |
| PF00469 | F-protein | Negative factor, (F-Protein) or Nef | P03407 |
| PF00487 | FA_desaturase | Fatty acid desaturase | P13516 |
| PF00498 | FHA | FHA domain | O60934 |
| PF00506 | Flu_NP | Influenza virus nucleoprotein | P03467 |
| PF00523 | Fusion_gly | Fusion glycoprotein F0 | H6X1Z0 |
| PF00551 | Formyl_trans_N | Formyl transferase | P28037 |
| PF00598 | Flu_M1 | Influenza Matrix protein (M1) | P03485 |
| PF00599 | Flu_M2 | Influenza Matrix protein (M2) | D5F6K1 |
| PF00600 | Flu_NS1 | Influenza non-structural protein (NS1) | A5A5U1 |
| PF00601 | Flu_NS2 | Influenza non-structural protein (NS2) | P03508 |
| PF00602 | Flu_PB1 | Influenza RNA-dependent RNA polymerase subunit PB1 | Q5V8Y6 |
| PF00603 | Flu_PA | Influenza RNA-dependent RNA polymerase subunit PA | C6H0Y9 |
| PF00604 | Flu_PB2_5th | Influenza RNA polymerase PB2 CAP binding domain | Q5V8X3 |
| PF00611 | FCH | Fes/CIP4, and EFC/F-BAR homology domain | O43586 |
| PF00624 | Flocculin | Flocculin repeat | |
| PF00630 | Filamin | Filamin/ABP280 repeat | P13466 |
| PF00646 | F-box | F-box domain | Q8N3Y1 |
| PF00667 | FAD_binding_1 | FAD binding domain | C5YJG8 |
| PF00669 | Flagellin_N | Bacterial flagellin N-terminal helical region | B7USU2 |
| PF00700 | Flagellin_C | Bacterial flagellin C-terminal helical region | B7USU2 |
| PF00743 | FMO-like | Flavin-binding monooxygenase-like | A0A0A8XFY0 |
| PF00754 | F5_F8_type_C | F5/8 type C domain | B2UQE4 |
| PF00757 | Furin-like | Furin-like cysteine rich region | P00533 |
| PF00762 | Ferrochelatase | Ferrochelatase | Q8Y565 |
| PF00771 | FHIPEP | FHIPEP family | P0C2V3 |
| PF00813 | FliP | FliP family | P0A1L3 |
| PF00869 | Flavi_glycoprot | Flavivirus glycoprotein, central and dimerisation domains | Q89292 |
| PF00890 | FAD_binding_2 | FAD binding domain | Q8GQE7 |
| PF00941 | FAD_binding_5 | FAD binding domain in molybdopterin dehydrogenase | P80457 |
| PF00948 | Flavi_NS1 | Flavivirus non-structural Protein NS1 | H9M640 |
| PF00970 | FAD_binding_6 | Oxidoreductase FAD-binding domain | A0A085ST13 |
| PF00972 | Flavi_NS5 | Flavivirus RNA-directed RNA polymerase, fingers and palm domains | Q91H74 |
| PF01002 | Flavi_NS2B | Flavivirus non-structural protein NS2B | Q32ZE1 |
| PF01004 | Flavi_M | Flavivirus envelope glycoprotein M | P14336 |
| PF01032 | FecCD | FecCD transport family | P06972 |
| PF01052 | FliMN_C | Type III flagellar switch regulator (C-ring) FliN C-term | O25674 |
| PF01070 | FMN_dh | FMN-dependent dehydrogenase | Q9UJM8 |
| PF01098 | FTSW_RODA_SPOVE | Cell cycle protein | Q5SIX3 |
| PF01115 | F_actin_cap_B | F-actin capping protein, beta subunit | A0PFK7 |
| PF01116 | F_bP_aldolase | Fructose-bisphosphate aldolase class-II | Q9URB4 |
| PF01149 | Fapy_DNA_glyco | Formamidopyrimidine-DNA glycosylase N-terminal domain | I4E596 |
| PF01226 | Form_Nir_trans | Formate/nitrite transporter | O77389 |
| PF01267 | F-actin_cap_A | F-actin capping protein alpha subunit | A0A4X1T8I3 |
| PF01268 | FTHFS | Formate--tetrahydrofolate ligase | B7L0A5 |
| PF01269 | Fibrillarin | Fibrillarin | D0KTQ8 |
| PF01325 | Fe_dep_repress | Iron dependent repressor, N-terminal DNA binding domain | A0A2A9J1W2 |
| PF01346 | FKBP_N | Domain amino terminal to FKBP-type peptidyl-prolyl isomerase | Q9HYX8 |
| PF01349 | Flavi_NS4B | Flavivirus non-structural protein NS4B | |
| PF01350 | Flavi_NS4A | Flavivirus non-structural protein NS4A | |
| PF01363 | FYVE | FYVE zinc finger | Q8IZQ1 |
| PF01392 | Fz | Fz domain | P56726 |
| PF01475 | FUR | Ferric uptake regulator family | Q9L2H5 |
| PF01491 | Frataxin_Cyay | Frataxin-like domain | C3SKF0 |
| PF01494 | FAD_binding_3 | FAD binding domain | A0A1E7MYN1 |
| PF01521 | Fe-S_biosyn | Iron-sulphur cluster biosynthesis | Q5FLQ3 |
| PF01534 | Frizzled | Frizzled/Smoothened family membrane region | P56726 |
| PF01557 | FAA_hydrolase | Fumarylacetoacetate (FAA) hydrolase C-terminal | A0QTY3 |
| PF01565 | FAD_binding_4 | FAD binding domain | A3RXB7 |
| PF01570 | Flavi_propep | Flavivirus polyprotein propeptide | A0A481XTV0 |
| PF01580 | FtsK_SpoIIIE | FtsK/SpoIIIE family | P9WNA5 |
| PF01581 | FARP | FMRFamide related peptide family | |
| PF01613 | Flavin_Reduct | Flavin reductase like domain | Q6Q271 |
| PF01687 | Flavokinase | Riboflavin kinase | Q59263 |
| PF01706 | FliG_C | FliG C-terminal domain | Q9WY63 |
| PF01728 | FtsJ | FtsJ-like methyltransferase | O42832 |
| PF01770 | Folate_carrier | Reduced folate carrier | P41440 |
| PF01794 | Ferric_reduct | Ferric reductase like transmembrane component | P04839 |
| PF01799 | Fer2_2 | [2Fe-2S] binding domain | P80457 |
| PF01827 | FTH | FTH domain | |
| PF01839 | FG-GAP | FG-GAP repeat | P06756 |
| PF01846 | FF | FF domain | P33203 |
| PF01883 | FeS_assembly_P | Iron-sulfur cluster assembly protein | Q9VTC4 |
| PF01913 | FTR | Formylmethanofuran-tetrahydromethanopterin formyltransferase | A9W3R8 |
| PF01950 | FBPase_3 | Fructose-1,6-bisphosphatase | B1YAL1 |
| PF01996 | F420_ligase | F420-0:Gamma-glutamyl ligase | O28028 |
| PF02049 | FliE | Flagellar hook-basal body complex protein FliE | A0A0D6FLN2 |
| PF02050 | FliJ | Flagellar FliJ protein | P0A1K1 |
| PF02106 | Fanconi_C | Fanconi anaemia group C protein | Q00597 |
| PF02107 | FlgH | Flagellar L-ring protein | A0A0J5DWE9 |
| PF02108 | FliH | Flagellar assembly protein FliH | P15934 |
| PF02119 | FlgI | Flagellar P-ring protein | A0A0F7J5J5 |
| PF02120 | Flg_hook | Flagellar hook-length control protein FliK | Q9I332 |
| PF02152 | FolB | Dihydroneopterin aldolase | B5Z9C8 |
| PF02154 | FliM | Flagellar motor switch protein FliM | A0A1W6VDB9 |
| PF02181 | FH2 | Formin Homology 2 Domain | Q6ZPF4 |
| PF02256 | Fe_hyd_SSU | Iron hydrogenase small subunit | A0A097ATG3 |
| PF02259 | FAT | FAT domain | Q9Y4A5 |
| PF02260 | FATC | FATC domain | P42345 |
| PF02300 | Fumarate_red_C | Fumarate reductase subunit C | B7MKV9 |
| PF02313 | Fumarate_red_D | Fumarate reductase subunit D | B7MKV8 |
| PF02318 | FYVE_2 | FYVE-type zinc finger | Q9HCH5 |
| PF02388 | FemAB | FemAB family | Q9EY50 |
| PF02421 | FeoB_N | Ferrous iron transport protein B | A0A2X3IBQ3 |
| PF02432 | Fimbrial_K88 | Fimbrial, major and minor subunit | |
| PF02433 | FixO | Cytochrome C oxidase, mono-heme subunit/FixO | D5ARP5 |
| PF02434 | Fringe | Fringe-like | Q7K237 |
| PF02441 | Flavoprotein | Flavoprotein | O84222 |
| PF02465 | FliD_N | Flagellar hook-associated protein 2 N-terminus | A0A3I4YJR7 |
| PF02469 | Fasciclin | Fasciclin domain | A0A5J4Z027 |
| PF02504 | FA_synthesis | Fatty acid synthesis protein | P71018 |
| PF02525 | Flavodoxin_2 | Flavodoxin-like fold | P16083 |
| PF02561 | FliS | Flagellar protein FliS | I9NY49 |
| PF02623 | FliW | FliW protein | A4ISV0 |
| PF02634 | FdhD-NarQ | FdhD/NarQ family | P32177 |
| PF02661 | Fic | Fic/DOC family | Q666X7 |
| PF02662 | FlpD | Methyl-viologen-reducing hydrogenase, delta subunit | Q2FKZ0 |
| PF02663 | FmdE | FmdE, Molybdenum formylmethanofuran dehydrogenase operon | Q2LQ23 |
| PF02687 | FtsX | FtsX-like permease C-terminal | Q6NEF1 |
| PF02741 | FTR_C | FTR, proximal lobe | A9W3R8 |
| PF02742 | Fe_dep_repr_C | Iron dependent repressor, metal binding and dimerisation domain | A0A2A9J1W2 |
| PF02782 | FGGY_C | FGGY family of carbohydrate kinases, C-terminal domain | A0A287BD08 |
| PF02906 | Fe_hyd_lg_C | Iron only hydrogenase large subunit, C-terminal domain | A0A097ATG3 |
| PF02911 | Formyl_trans_C | Formyl transferase, C-terminal domain | P28037 |
| PF02913 | FAD-oxidase_C | FAD linked oxidases, C-terminal domain | Q0SBK1 |
| PF02941 | FeThRed_A | Ferredoxin thioredoxin reductase variable alpha chain | Q8LBP6 |
| PF02943 | FeThRed_B | Ferredoxin thioredoxin reductase catalytic beta chain | Q6AL91 |
| PF02947 | Flt3_lig | flt3 ligand | A0A287B929 |
| PF02952 | Fucose_iso_C | L-fucose isomerase, C-terminal domain | A0A443VNT1 |
| PF02971 | FTCD | Formiminotransferase domain | O88618 |
| PF02980 | FokI_dom_2 | FokI, recognition domain, subdomain 2 | P14870 |
| PF02981 | FokI_D1 | FokI, recognition domain, subdomain 1 | P14870 |
| PF02986 | Fn_bind | Fibronectin binding repeat | A0A0H3BX48 |
| PF03024 | Folate_rec | Folate receptor family | Q96QV1 |
| PF03069 | FmdA_AmdA | Acetamidase/Formamidase family | A0A0H3NNJ4 |
| PF03101 | FAR1 | FAR1 DNA-binding domain | |
| PF03147 | FDX-ACB | Ferredoxin-fold anticodon binding domain | A0A0D6GBX6 |
| PF03239 | FTR1 | Iron permease FTR1 family | |
| PF03320 | FBPase_glpX | Bacterial fructose-1,6-bisphosphatase, glpX-encoded | Q5NEJ8 |
| PF03358 | FMN_red | NADPH-dependent FMN reductase | A1BCD5 |
| PF03405 | FA_desaturase_2 | Fatty acid desaturase | Q41510 |
| PF03441 | FAD_binding_7 | FAD binding domain of DNA photolyase | O77059 |
| PF03511 | FANCA_CTD | Fanconi anaemia group A protein C-terminal domain | O15360 |
| PF03516 | Filaggrin | Filaggrin | |
| PF03597 | FixS | Cytochrome oxidase maturation protein cbb3-type | |
| PF03614 | Flag1_repress | Repressor of phase-1 flagellin | |
| PF03623 | Focal_AT | Focal adhesion targeting region | Q05397 |
| PF03630 | Fumble | Fumble | Q04430 |
| PF03646 | FlaG | FlaG protein | A0A0B2DZ94 |
| PF03748 | FliL | Flagellar basal body-associated protein FliL | A0A293T1P9 |
| PF03781 | FGE-sulfatase | Sulfatase-modifying factor enzyme 1 | Q8KND1 |
| PF03799 | FtsQ_DivIB_C | Cell division protein FtsQ/DivIB, C-terminal | P06136 |
| PF03807 | F420_oxidored | NADP oxidoreductase coenzyme F420-dependent | P32322 |
| PF03867 | FTZ | Fushi tarazu (FTZ), N-terminal region | |
| PF03881 | Fructosamin_kin | Fructosamine kinase | Q9LEW8 |
| PF03930 | Flp_N | Recombinase Flp protein N-terminus | P03870 |
| PF03959 | FSH1 | Serine hydrolase (FSH1) | P38777 |
| PF03961 | FapA | Flagellar Assembly Protein A beta solenoid domain | |
| PF03963 | FlgD | Flagellar hook capping protein - N-terminal region | A0A0F7J820 |
| PF04023 | FeoA | FeoA domain | Q5LFM5 |
| PF04060 | FeS | Putative Fe-S cluster | Q07340 |
| PF04068 | Fer4_RLI | Possible Fer4-like domain in RNase L inhibitor, RLI | G1SG72 |
| PF04075 | F420H2_quin_red | F420H(2)-dependent quinone reductase | P9WP11 |
| PF04082 | Fungal_trans | Fungal specific transcription factor domain | |
| PF04116 | FA_hydroxylase | Fatty acid hydroxylase | Q03529 |
| PF04186 | FxsA | FxsA cytoplasmic membrane protein | |
| PF04205 | FMN_bind | FMN-binding domain | A0A085R7S2 |
| PF04216 | FdhE_N | FdhE, N-terminal | Q9HV00 |
| PF04299 | FMN_bind_2 | Putative FMN-binding domain | Q5L206 |
| PF04300 | FBA | F-box associated region | Q80UW2 |
| PF04316 | FlgM | Anti-sigma-28 factor, FlgM | O66683 |
| PF04324 | Fer2_BFD | BFD-like [2Fe-2S] binding domain | Q9HY80 |
| PF04339 | FemAB_like | Peptidogalycan biosysnthesis/recognition | |
| PF04347 | FliO | Flagellar biosynthesis protein, FliO | |
| PF04384 | Fe-S_assembly | Iron-sulphur cluster assembly | P0C0L9 |
| PF04385 | FAINT | Domain of unknown function, DUF529 | |
| PF04422 | FrhB_FdhB_N | Coenzyme F420 hydrogenase/dehydrogenase, beta subunit N-term | A0A2Z5PF12 |
| PF04432 | FrhB_FdhB_C | Coenzyme F420 hydrogenase/dehydrogenase, beta subunit C terminus | A0A2Z5PF12 |
| PF04449 | Fimbrial_CS1 | CS1 type fimbrial major subunit | P0CK93 |
| PF04500 | FLYWCH | FLYWCH zinc finger domain | Q4VC44 |
| PF04620 | FlaA | Flagellar filament outer layer protein Flaa | |
| PF04632 | FUSC | Fusaric acid resistance protein family | |
| PF04703 | FaeA | FaeA-like protein | Q04822 |
| PF04732 | Filament_head | Intermediate filament head (DNA binding) region | |
| PF04750 | Far-17a_AIG1 | FAR-17a/AIG1-like protein | |
| PF04773 | FecR | FecR protein | A6LCL9 |
| PF04799 | Fzo_mitofusin | fzo-like conserved region | Q811U4 |
| PF04900 | Fcf1 | Fcf1 | Q05498 |
| PF04930 | FUN14 | FUN14 family | |
| PF04961 | FTCD_C | Formiminotransferase-cyclodeaminase | Q49135 |
| PF04964 | Flp_Fap | Flp/Fap pilin component | |
| PF04999 | FtsL | Cell division protein FtsL | |
| PF05013 | FGase | N-formylglutamate amidohydrolase | Q46VW8 |
| PF05130 | FlgN | FlgN protein | P0A1J7 |
| PF05149 | Flagellar_rod | Paraflagellar rod protein | |
| PF05182 | Fip1 | Fip1 motif | Q6UN15 |
| PF05187 | Fer4_ETF_QO | Electron transfer flavoprotein-ubiquinone oxidoreductase, 4Fe-4S | R4NRM2 |
| PF05202 | Flp_C | Recombinase Flp protein | P03870 |
| PF05247 | FlhD | Flagellar transcriptional activator (FlhD) | P0A8S9 |
| PF05280 | FlhC | Flagellar transcriptional activator (FlhC) | P0ABY7 |
| PF05377 | FlaC_arch | Flagella accessory protein C (FlaC) | |
| PF05400 | FliT | Flagellar protein FliT | P0A1N3 |
| PF05427 | FIBP | Acidic fibroblast growth factor binding (FIBP) | |
| PF05523 | FdtA | WxcM-like, C-terminal | C5ZW00 |
| PF05545 | FixQ | Cbb3-type cytochrome oxidase component FixQ | |
| PF05594 | Fil_haemagg | Haemagglutinin repeat | |
| PF05681 | Fumerase | Fumarate hydratase (Fumerase) | E9AE57 |
| PF05683 | Fumerase_C | Fumarase C-terminus | E9AE57 |
| PF05725 | FNIP | FNIP Repeat | E3T5W0 |
| PF05751 | FixH | FixH | D5ARP9 |
| PF05911 | FPP | Filament-like plant protein, long coiled-coil | |
| PF05933 | Fun_ATP-synt_8 | Fungal ATP synthase protein 8 (A6L) | P00856 |
| PF05964 | FYRN | F/Y-rich N-terminus | Q3YBR2 |
| PF05965 | FYRC | F/Y rich C-terminus | Q3YBR2 |
| PF05994 | FragX_IP | Cytoplasmic Fragile-X interacting family | Q7L576 |
| PF05996 | Fe_bilin_red | Ferredoxin-dependent bilin reductase | Q55891 |
| PF06229 | FRG1 | FRG1-like domain | Q14331 |
| PF06268 | Fascin | Fascin domain | Q16658 |
| PF06276 | FhuF | Ferric iron reductase FhuF-like transporter | A0A1Q5L7T0 |
| PF06280 | fn3_5 | Fn3-like domain | P15926 |
| PF06289 | FlbD | Flagellar and Swarming motility proteins | |
| PF06366 | FlhE | Flagellar protein FlhE | |
| PF06429 | Flg_bbr_C | Flagellar basal body rod FlgEFG protein C-terminal | A0A0F7J893 |
| PF06473 | FGF-BP1 | FGF binding protein 1 (FGF-BP1) | |
| PF06480 | FtsH_ext | FtsH Extracellular | P0AAI3 |
| PF06490 | FleQ | Flagellar regulatory protein FleQ | A0A7Z8DVG5 |
| PF06500 | FrsA-like | Esterase FrsA-like | Q7MZT8 |
| PF06574 | FAD_syn | FAD synthetase | Q59263 |
| PF06702 | Fam20C | Golgi casein kinase, C-terminal, Fam20 | Q8IXL6 |
| PF06730 | FAM92 | FAM92 protein | |
| PF06743 | FAST_1 | FAST kinase-like protein, subdomain 1 | |
| PF06818 | Fez1 | Fez1 | |
| PF06874 | FBPase_2 | Firmicute fructose-1,6-bisphosphatase | |
| PF06901 | FrpC | RTX iron-regulated protein FrpC | Q9K129 |
| PF06902 | Fer4_19 | Divergent 4Fe-4S mono-cluster | |
| PF06905 | FAIM1 | Fas apoptotic inhibitory molecule (FAIM1) | Q9NVQ4 |
| PF06916 | FAM210A-B_dom | FAM210A/B-like domain | |
| PF06963 | FPN1 | Ferroportin1 (FPN1) | Q9NP59 |
| PF06986 | F_T4SS_TraN | F-type Type IV secretion system, TraN | |
| PF07078 | FYTT | Forty-two-three protein | |
| PF07091 | FmrO | Ribosomal RNA methyltransferase (FmrO) | Q33DX5 |
| PF07174 | FAP | Fibronectin-attachment protein (FAP) domain | P9WIR7 |
| PF07195 | FliD_C | Flagellar hook-associated protein 2 C-terminus | A0A3I4YJR7 |
| PF07196 | Flagellin_IN | Flagellin hook IN motif | P22251 |
| PF07294 | Fibroin_P25 | Fibroin P25 | |
| PF07309 | FlaF | Flagellar protein FlaF | |
| PF07367 | FB_lectin | Fungal fruit body lectin | A0A0M3KL31 |
| PF07378 | FlbT | Flagellar protein FlbT | |
| PF07504 | FTP | Fungalysin/Thermolysin Propeptide Motif | P00800 |
| PF07554 | FIVAR | FIVAR domain | Q5HPA2 |
| PF07559 | FlgE_D2 | Flagellar basal body protein FlaE D2 domain | P0A1J1 |
| PF07652 | Flavi_DEAD | Flavivirus DEAD domain | P26663 |
| PF07664 | FeoB_C | Ferrous iron transport protein B C terminus | |
| PF07692 | Fea1 | Low iron-inducible periplasmic protein | |
| PF07729 | FCD | FCD domain | C0RLW1 |
| PF07734 | FBA_1 | F-box associated | |
| PF07735 | FBA_2 | F-box associated | |
| PF07763 | FEZ | FEZ-like protein | |
| PF07837 | FTCD_N | Formiminotransferase domain, N-terminal subdomain | O88618 |
| PF07840 | FadR_C | FadR C-terminal domain | A0A0H0Y8X2 |
| PF07881 | Fucose_iso_N1 | L-fucose isomerase, first N-terminal domain | A0A443VNT1 |
| PF07882 | Fucose_iso_N2 | L-fucose isomerase, second N-terminal domain | A0A443VNT1 |
| PF07899 | Frigida | Frigida-like protein | A0A182DWB3 |
| PF07921 | Fibritin_C | Fibritin C-terminal region | M1E1E4 |
| PF07938 | Fungal_lectin | Fungal fucose-specific lectin | A0A0S4TLR1 |
| PF07959 | Fucose_pyrophosphorylase | Fucose pyrophosphorylase domain | Q58T34 |
| PF07972 | Flavodoxin_NdrI | NrdI Flavodoxin like | Q81G57 |
| PF07977 | FabA | FabA-like domain | O33877 |
| PF08017 | Fibrinogen_BP | Fibrinogen binding protein | |
| PF08021 | FAD_binding_9 | Siderophore-interacting FAD-binding domain | P9WQJ9 |
| PF08022 | FAD_binding_8 | FAD-binding domain | P04839 |
| PF08150 | FerB | FerB (NUC096) domain | |
| PF08151 | FerI | FerI (NUC094) domain | |
| PF08165 | FerA | FerA (NUC095) domain | |
| PF08268 | FBA_3 | F-box associated domain | |
| PF08289 | Flu_M1_C | Influenza Matrix protein (M1) C-terminal domain | P03485 |
| PF08350 | FilR1_middle | Methanogenesis regulatory protein FilR1, middle domain | |
| PF08354 | Fas1-AflB-like_hel | Fatty acid synthase subunit beta/Fas1-like, helical | P34731 |
| PF08368 | FAST_2 | FAST kinase-like protein, subdomain 2 | |
| PF08387 | FBD | FBD | |
| PF08392 | FAE1_CUT1_RppA | FAE1/Type III polyketide synthase-like protein | |
| PF08430 | Forkhead_N | Forkhead N-terminal region | |
| PF08445 | FR47 | FR47-like protein | Q2G7J6 |
| PF08495 | FIST | FIST N domain | |
| PF08555 | FAM32A | FAM32A | Q9Y421 |
| PF08609 | Fes1 | Nucleotide exchange factor Fes1 | Q9NZL4 |
| PF08698 | Fcf2 | Fcf2 pre-rRNA processing | Q12035 |
| PF08702 | Fib_alpha | Fibrinogen alpha/beta chain family | P02679 |
| PF08714 | Fae | Formaldehyde-activating enzyme (Fae) | Q9FA38 |
| PF08736 | FA | FERM adjacent (FA) | E7FE33 |
| PF08771 | FRB_dom | FKBP12-rapamycin binding domain | P42345 |
| PF08794 | FHBP_C | Factor H binding protein, C-terminal | E6MV22 |
| PF08867 | FRG | FRG domain | |
| PF08884 | Flagellin_D3 | Flagellin D3 domain | P04949 |
| PF08919 | F_actin_bind | F-actin binding | P42684 |
| PF09005 | FUBP_C | Far upstream element-binding protein, C-terminal | Q7JPS0 |
| PF09012 | FeoC | FeoC like transcriptional regulator | W9BMW4 |
| PF09160 | FimH_man-bind | FimH, mannose binding | P08191 |
| PF09163 | Form-deh_trans | Formate dehydrogenase N, transmembrane | P0AAJ3 |
| PF09242 | FCSD-flav_bind | Flavocytochrome c sulphide dehydrogenase, flavin-binding | W0DP88 |
| PF09252 | Feld-I_B | Allergen Fel d I-B chain | P30440 |
| PF09254 | FokI_cleav_dom | FokI, cleavage domain | P14870 |
| PF09259 | Fve | Fungal immunomodulatory protein Fve | E7FH75 |
| PF09289 | FOLN | Follistatin/Osteonectin-like EGF domain | Q14515 |
| PF09298 | FAA_hydrolase_N | Fumarylacetoacetase N-terminal | Q144Z1 |
| PF09309 | FCP1_C | FCP1, C-terminal | Q9Y5B0 |
| PF09379 | FERM_N | FERM N-terminal domain | P26038 |
| PF09380 | FERM_C | FERM C-terminal PH-like domain | P26038 |
| PF09397 | FtsK_gamma | Ftsk gamma domain | Q9I0M3 |
| PF09398 | FOP_dimer | FOP N terminal dimerisation domain | O95684 |
| PF09403 | FadA | Adhesion protein FadA | Q5I6B0 |
| PF09421 | FRQ | Frequency clock protein | |
| PF09479 | Flg_new | Listeria-Bacteroides repeat domain (List_Bact_rpt) | P0DQD2 |
| PF09532 | FDF | FDF domain | Q9XW17 |
| PF09538 | FYDLN_acid | Protein of unknown function (FYDLN_acid) | |
| PF09603 | Fib_succ_major | Fibrobacter succinogenes major domain (Fib_succ_major) | |
| PF09645 | F-112 | F-112 protein | P20220 |
| PF09725 | Fra10Ac1 | Folate-sensitive fragile site protein Fra10Ac1 | |
| PF09758 | FPL | Uncharacterised conserved protein | |
| PF09765 | FANCL_d1 | FANCL UBC-like domain 1 | Q9NW38 |
| PF09766 | FmiP_Thoc5 | Fms-interacting protein/Thoc5 | Q13769 |
| PF10080 | FtrD-like | Membrane iron-sulfur containing protein FtrD-like | |
| PF10113 | Fibrillarin_2 | FeGP cofactor biosynthesis protein, fibrillarin family | |
| PF10154 | Fy-3 | Ferry endosomal RAB5 effector complex subunit 3 | |
| PF10182 | Flo11 | Flo11 domain | C4R2D7 |
| PF10187 | FAM192A_Fyv6_N | FAM192A/Fyv6, N-terminal domain | Q9GZU8 |
| PF10261 | FIT | Fat storage-inducing transmembrane protein | |
| PF10277 | Frag1 | Frag1/DRAM/Sfk1 family | |
| PF10306 | FLILHELTA | Hypothetical protein FLILHELTA | |
| PF10415 | FumaraseC_C | Fumarase C C-terminus | A0PKR5 |
| PF10442 | FIST_C | FIST C domain | |
| PF10577 | FAM171A1-2-B_N | FAM171A1/A2/B, N-terminal | |
| PF10595 | FAM161A_B | Protein FAM161A/B | |
| PF10621 | FpoO | F420H2 dehydrogenase subunit FpoO | |
| PF10768 | FliX | Class II flagellar assembly regulator | |
| PF10791 | F1F0-ATPsyn_F | Mitochondrial F1-F0 ATP synthase subunit F of fungi | Q06405 |
| PF10862 | FcoT | FcoT-like thioesterase domain | Q79ZR9 |
| PF10917 | Fungus-induced | Fungus-induced protein | |
| PF10955 | Fin | Anti-sigma-F factor Fin | P37553 |
| PF11107 | FANCF | Fanconi anemia group F protein (FANCF) | Q9NPI8 |
| PF11229 | Focadhesin | Focadhesin | |
| PF11250 | FAF | Fantastic Four meristem regulator | |
| PF11390 | FdsD | NADH-dependant formate dehydrogenase delta subunit FdsD | D5AQG8 |
| PF11510 | FA_FANCE | Fanconi Anaemia group E protein FANCE | Q9HB96 |
| PF11575 | FhuF_C | FhuF 2Fe-2S C-terminal domain | |
| PF11614 | FixG_C | IG-like fold at C-terminal of FixG, putative oxidoreductase | Q87KC5 |
| PF11652 | FAM167 | FAM167 | |
| PF11704 | Folliculin | Vesicle coat protein involved in Golgi to plasma membrane transport | Q8NFG4 |
| PF11768 | Frtz | WD repeat-containing and planar cell polarity effector protein Fritz | Q8C456 |
| PF11793 | FANCL_C | FANCL C-terminal domain | Q9NW38 |
| PF11817 | Foie-gras_1 | Foie gras liver health family 1 | Q8IRE3 |
| PF11951 | Fungal_trans_2 | Fungal specific transcription factor domain | Q12151 |
| PF11983 | FtsA_C | Cell division protein FtsA, C-terminal | |
| PF12018 | FAP206 | Domain of unknown function | |
| PF12127 | FloA | Flotillin-like protein FloA | |
| PF12160 | Fibrinogen_aC | Fibrinogen alpha C domain | P02671 |
| PF12235 | FXMRP1_C_core | Fragile X-related 1 protein core C terminal | |
| PF12318 | FAD-SLDH | Membrane bound FAD containing D-sorbitol dehydrogenase | A0A0H3KLY3 |
| PF12327 | FtsZ_C | FtsZ family, C-terminal domain | Q2FZ89 |
| PF12351 | Fig1 | Ca2+ regulator and membrane fusion protein Fig1 | |
| PF12401 | FhaA_N | FhaA, N-terminal domain | P71590 |
| PF12414 | Fox-1_C | Calcitonin gene-related peptide regulator C terminal | |
| PF12445 | FliC | Flagellin protein | B7USU2 |
| PF12538 | FtsK_SpoIIIE_N | DNA transporter | A4IKE7 |
| PF12602 | FinO_N | Fertility inhibition protein N terminal | P29367 |
| PF12611 | Flagellar_put | Putative flagellar | |
| PF12613 | FliC_D2 | Flagellin, D2 domain | P70944 |
| PF12641 | Flavodoxin_3 | Flavodoxin domain | |
| PF12669 | FeoB_associated | FeoB-associated Cys-rich membrane protein | |
| PF12682 | Flavodoxin_4 | Flavodoxin | A7VAB4 |
| PF12709 | Fungal_TACC | Fungal Transforming acidic coiled-coil (TACC) proteins | |
| PF12724 | Flavodoxin_5 | Flavodoxin domain | |
| PF12797 | Fer4_2 | 4Fe-4S binding domain | |
| PF12798 | Fer4_3 | 4Fe-4S binding domain | A0A097ATK6 |
| PF12800 | Fer4_4 | 4Fe-4S binding domain | A0A097ATK6 |
| PF12801 | Fer4_5 | 4Fe-4S binding domain | |
| PF12805 | FUSC-like | FUSC-like inner membrane protein yccS | |
| PF12831 | FAD_oxidored | FAD dependent oxidoreductase | P9WHH9 |
| PF12837 | Fer4_6 | 4Fe-4S binding domain | Q39TV9 |
| PF12838 | Fer4_7 | 4Fe-4S dicluster domain | Q8KAY1 |
| PF12892 | FctA | Spy0128-like isopeptide containing domain | A0A096ZH83 |
| PF12902 | Ferritin-like | Ferritin-like | Q9AAP0 |
| PF12933 | FTO_NTD | FTO catalytic domain | Q9C0B1 |
| PF12934 | FTO_CTD | FTO C-terminal domain | Q9C0B1 |
| PF12937 | F-box-like | F-box-like | Q969H0 |
| PF13013 | F-box-like_2 | F-box-like domain | |
| PF13040 | Fur_reg_FbpB | Fur-regulated basic protein B | |
| PF13076 | Fur_reg_FbpA | Fur-regulated basic protein A | |
| PF13085 | Fer2_3 | 2Fe-2S iron-sulfur cluster binding domain | P21912 |
| PF13093 | FTA4 | Kinetochore complex Fta4 of Sim4 subunit, or CENP-50 | |
| PF13095 | FTA2 | Kinetochore Sim4 complex subunit FTA2 | |
| PF13183 | Fer4_8 | 4Fe-4S dicluster domain | A0QPJ2 |
| PF13187 | Fer4_9 | 4Fe-4S dicluster domain | P56755 |
| PF13237 | Fer4_10 | 4Fe-4S dicluster domain | A0A218LNN1 |
| PF13247 | Fer4_11 | 4Fe-4S dicluster domain | Q72EJ0 |
| PF13287 | Fn3_assoc | Fn3 associated | A0A174QSL3 |
| PF13332 | Fil_haemagg_2 | Hemagglutinin repeat | |
| PF13353 | Fer4_12 | 4Fe-4S single cluster domain | G9MQB8 |
| PF13370 | Fer4_13 | 4Fe-4S single cluster domain of Ferredoxin I | Q75VV9 |
| PF13452 | FAS1_DH_region | FAS1-like, dehydratase domain region | P34731 |
| PF13459 | Fer4_15 | 4Fe-4S single cluster domain | O53937 |
| PF13484 | Fer4_16 | 4Fe-4S double cluster binding domain | Q2RMD6 |
| PF13491 | FtsK_4TM | 4TM region of DNA translocase FtsK/SpoIIIE | |
| PF13510 | Fer2_4 | 2Fe-2S iron-sulfur cluster binding domain | A0QU30 |
| PF13515 | FUSC_2 | Fusaric acid resistance protein-like | |
| PF13517 | FG-GAP_3 | FG-GAP-like repeat | A0A1U7Q1Z0 |
| PF13534 | Fer4_17 | 4Fe-4S dicluster domain | P07014 |
| PF13553 | FIIND | Function to find | Q9Y2G2 |
| PF13668 | Ferritin_2 | Ferritin-like domain | |
| PF13684 | FakA-like_C | Fatty acid kinase subunit A-like, C-terminal | A4VXI8 |
| PF13685 | Fe-ADH_2 | Iron-containing alcohol dehydrogenase | A3MTM6 |
| PF13746 | Fer4_18 | 4Fe-4S dicluster domain | |
| PF13784 | Fic_N | Fic/DOC family N-terminal | Q8E9K5 |
| PF13860 | FlgD_ig | FlgD Ig-like domain | A0A0F7J820 |
| PF13861 | FLgD_tudor | FlgD Tudor-like domain | A0A0F7J820 |
| PF13865 | FoP_duplication | C-terminal duplication domain of Friend of PRMT1 | |
| PF13928 | Flocculin_t3 | Flocculin type 3 repeat | |
| PF13955 | Fst_toxin | Toxin Fst, type I toxin-antitoxin system | |
| PF14160 | FAM110_C | Centrosome-associated C terminus | |
| PF14161 | FAM110_N | Centrosome-associated N terminus | |
| PF14282 | FlxA | FlxA-like protein | |
| PF14288 | FKS1_dom1 | 1,3-beta-glucan synthase subunit FKS1, domain-1 | |
| PF14310 | Fn3-like | Fibronectin type III-like domain | C9ZDY4 |
| PF14312 | FG-GAP_2 | FG-GAP repeat | |
| PF14407 | Frankia_peptide | Ribosomally synthesized peptide prototyped by Frankia Franean1_4349. | |
| PF14450 | FtsA | Cell division protein FtsA | A0A090T942 |
| PF14481 | Fimbrial_PilY2 | Type 4 fimbrial biogenesis protein PilY2 | Q51537 |
| PF14484 | FISNA | Fish-specific NACHT associated domain | Q96P20 |
| PF14631 | FancD2 | Fanconi anaemia protein FancD2 nuclease | Q9BXW9 |
| PF14636 | FNIP_N | Folliculin-interacting protein N-terminus | Q9P278 |
| PF14637 | FNIP_M | Folliculin-interacting protein middle domain | Q9P278 |
| PF14638 | FNIP_C | Folliculin-interacting protein C-terminus | Q9P278 |
| PF14642 | FAM47 | FAM47 family | |
| PF14647 | FAM91_N | FAM91 N-terminus | |
| PF14648 | FAM91_C | FAM91 C-terminus | |
| PF14650 | FAM75 | FAM75 family | |
| PF14670 | FXa_inhibition | Coagulation Factor Xa inhibitory site | O75581 |
| PF14674 | FANCI_S1-cap | FANCI solenoid 1 cap | Q9NVI1 |
| PF14675 | FANCI_S1 | FANCI solenoid 1 | Q9NVI1 |
| PF14676 | FANCI_S2 | FANCI solenoid 2 | Q9NVI1 |
| PF14677 | FANCI_S3 | FANCI solenoid 3 | Q9NVI1 |
| PF14678 | FANCI_S4 | FANCI solenoid 4 | Q9NVI1 |
| PF14679 | FANCI_HD1 | FANCI helical domain 1 | Q9NVI1 |
| PF14680 | FANCI_HD2 | FANCI helical domain 2 | Q9NVI1 |
| PF14686 | fn3_3 | Polysaccharide lyase family 4, domain II | Q00019 |
| PF14691 | Fer4_20 | Dihydroprymidine dehydrogenase domain II, 4Fe-4S cluster | Q28943 |
| PF14697 | Fer4_21 | 4Fe-4S dicluster domain | Q28943 |
| PF14715 | FixP_N | N-terminal domain of cytochrome oxidase-cbb3, FixP | D5ARP7 |
| PF14753 | FAM221 | Protein FAM221A/B | |
| PF14774 | FAM177 | FAM177 family | |
| PF14799 | FAM195 | FAM195 family | |
| PF14826 | FACT-Spt16_Nlob | FACT complex subunit SPT16 N-terminal lobe domain | C4QYQ8 |
| PF14841 | FliG_M | FliG middle domain | Q9WY63 |
| PF14842 | FliG_N | FliG N-terminal domain | O25119 |
| PF14851 | FAM176 | FAM176 family | |
| PF14852 | Fis1_TPR_N | Fis1 N-terminal tetratricopeptide repeat | P40515 |
| PF14853 | Fis1_TPR_C | Fis1 C-terminal tetratricopeptide repeat | P40515 |
| PF14886 | FAM183 | FAM183A and FAM183B related | A6NL82 |
| PF14904 | FAM86 | Family of unknown function | |
| PF14922 | FWWh | Protein of unknown function | |
| PF14967 | FAM70 | FAM70 protein | |
| PF14977 | FAM194 | FAM194 protein | |
| PF14981 | FAM165 | FAM165 family | |
| PF15010 | FAM131 | Putative cell signalling | |
| PF15051 | FAM198 | FAM198 protein | |
| PF15067 | FAM124 | FAM124 domain | |
| PF15068 | FAM101 | FAM101 family | |
| PF15069 | FAM163 | FAM163 family | |
| PF15107 | FAM216B | FAM216B protein family | |
| PF15124 | FANCD2OS | FANCD2 opposite strand protein | |
| PF15146 | FANCAA | Fanconi anemia-associated | Q0VG06 |
| PF15173 | FAM180 | FAM180 family | |
| PF15193 | FAM24 | FAM24 family | |
| PF15206 | FAM209 | FAM209 family | |
| PF15215 | FDC-SP | Follicular dendritic cell secreted peptide | |
| PF15242 | FAM53 | Family of FAM53 | |
| PF15258 | FAM222A | Protein family of FAM222A | |
| PF15260 | FAM219A | Protein family FAM219A | |
| PF15265 | FAM196 | FAM196 family | |
| PF15315 | FRG2 | Facioscapulohumeral muscular dystrophy candidate 2 | |
| PF15342 | FAM212 | FAM212 family | Q96EL1 |
| PF15344 | FAM217 | FAM217 family | |
| PF15388 | FAM117 | Protein Family FAM117 | |
| PF15396 | FAM60A | Protein Family FAM60A | |
| PF15423 | FLYWCH_N | FLYWCH-type zinc finger-containing protein | |
| PF15434 | FAM104 | Family 104 | |
| PF15487 | FAM220 | FAM220 family | |
| PF15495 | Fimbrillin_C | Major fimbrial subunit protein type IV, Fimbrillin, C-terminal | B2RH54 |
| PF15554 | FSIP1 | FSIP1 family | |
| PF15665 | FAM184 | Family with sequence similarity 184, A and B | |
| PF15722 | FAM153 | FAM153 family | |
| PF15751 | FANCA_interact | FAAP20 FANCA interaction domain | |
| PF15783 | FSIP2 | Fibrous sheath-interacting protein 2 | |
| PF15814 | FAM199X | Protein family FAM199X | |
| PF15819 | Fibin | Fin bud initiation factor homologue | |
| PF15825 | FAM25 | FAM25 family | |
| PF15832 | FAM27 | FAM27 D and E protein family | |
| PF15865 | Fanconi_A_N | Fanconi anaemia group A protein N terminus | O15360 |
| PF15878 | Frey | Protein Frey | |
| PF15888 | FOG_N | Folded gastrulation N-terminus | |
| PF15913 | Furin-like_2 | Furin-like repeat, cysteine-rich | Q8BFU0 |
| PF15914 | FAM193_C | FAM193 family C-terminal | |
| PF15941 | FidL_like | FidL-like putative membrane protein | |
| PF15966 | F-box_4 | F-box | |
| PF15975 | Flot | Flotillin | |
| PF15993 | Fuseless | Fuseless | |
| PF16046 | FAM76 | FAM76 protein | |
| PF16096 | FXR_C1 | Fragile X-related 1 protein C-terminal region 2 | |
| PF16097 | FXR_C3 | Fragile X-related 1 protein C-terminal region 3 | |
| PF16098 | FXMR_C2 | Fragile X messenger ribonucleoprotein 1, C-terminal region 2 | |
| PF16104 | FPRL1_inhibitor | Formyl peptide receptor-like 1 inhibitory protein | |
| PF16159 | FOXP-CC | FOXP coiled-coil domain | Q99JB6 |
| PF16165 | Ferlin_C | Ferlin C-terminus | |
| PF16344 | FecR_C | FecR, C-terminal | A6LCL9 |
| PF16350 | FAO_M | FAD dependent oxidoreductase central domain | Q9UI17 |
| PF16376 | fragilysinNterm | N-terminal domain of fragilysin | P54355 |
| PF16511 | FERM_f0 | N-terminal or F0 domain of Talin-head FERM | P26039 |
| PF16522 | FliS_cochap | Flagellar FLiS export co-chaperone, HP1076 | O25709 |
| PF16538 | FlgT_C | Flagellar assembly protein T, C-terminal domain | D9N551 |
| PF16539 | FlgT_M | Flagellar assembly protein T, middle domain | D9N551 |
| PF16548 | FlgT_N | Flagellar assembly protein T, N-terminal domain | D9N551 |
| PF16571 | FBP_C | FBP C-terminal treble-clef zinc-finger | Q8GNY5 |
| PF16662 | FLYWCH_u | FLYWCH-type zinc finger-containing protein 1 | Q4VC44 |
| PF16675 | FOXO_KIX_bdg | KIX-binding domain of forkhead box O, CR2 | |
| PF16676 | FOXO-TAD | Transactivation domain of FOXO protein family | |
| PF16692 | Folliculin_C | Folliculin C-terminal domain | Q8NFG4 |
| PF16757 | Fucosidase_C | Alpha-L-fucosidase C-terminal domain | K1KV82 |
| PF16783 | FANCM-MHF_bd | FANCM to MHF binding domain | A0A1D5PRR9 |
| PF16794 | fn3_4 | Fibronectin-III type domain | |
| PF16797 | Fungal_KA1 | Fungal kinase associated-1 domain | P25389 |
| PF16893 | fn3_2 | Fibronectin type III domain | Q12114 |
| PF16902 | FokI_D3 | FokI, D3 domain | P14870 |
| PF16947 | Ferredoxin_N | N-terminal region of 4Fe-4S ferredoxin iron-sulfur binding | |
| PF16970 | FimA | Type-1 fimbrial protein, A | |
| PF16973 | FliN_N | Flagellar motor switch protein FliN N-terminal | P26419 |
| PF16982 | Flp1_like | Putative Flagellin, Flp1-like, domain | |
| PF17179 | Fer4_22 | 4Fe-4S dicluster domain | |
| PF17300 | FIN1 | Filaments in between nuclei protein-1 | |
| PF17315 | FMP23 | Found in mitochondrial proteome | |
| PF17357 | FIT1_2 | Facilitor Of iron transport 1 and 2 | |
| PF17672 | FIMP | Fertilisation-influencing membrane protein | |
| PF17680 | FlgO | FlgO protein | |
| PF17742 | Fndc10 | Fibronectin type III domain-containing protein 10 | |
| PF17766 | fn3_6 | Fibronectin type-III domain | Q39547 |
| PF17808 | fn3_PAP | Fn3-like domain from Purple Acid Phosphatase | Q8VX11 |
| PF17828 | FAS_N | N-terminal domain in fatty acid synthase subunit beta | P34731 |
| PF17845 | FbpC_C_terminal | FbpC C-terminal regulatory nucleotide binding domain | Q5FA19 |
| PF17854 | FtsK_alpha | FtsK alpha domain | Q9I0M3 |
| PF17891 | FluMu_N | Mu-like prophage FluMu N-terminal domain | P44228 |
| PF17910 | FeoB_Cyto | FeoB cytosolic helical domain | A0A2X3IBQ3 |
| PF17913 | FHA_2 | FHA domain | Q8IW19 |
| PF17951 | FAS_meander | Fatty acid synthase meander beta sheet domain | P34731 |
| PF18009 | Fer4_23 | 4Fe-4S iron-sulfur cluster binding domain | Q9RS86 |
| PF18023 | FKBP_N_2 | BDBT FKBP like N-terminal | Q9VDE4 |
| PF18025 | FucT_N | Alpha-(1,3)-fucosyltransferase FucT N-terminal domain | O30511 |
| PF18032 | FRP | Photoprotection regulator fluorescence recovery protein | A0A0D6KMZ1 |
| PF18038 | FERM_N_2 | FERM N-terminal domain | Q00944 |
| PF18046 | FKBP26_C | FKBP26_C-terminal | Q58235 |
| PF18060 | F_actin_bund_C | F actin bundling C terminal | P24005 |
| PF18072 | FGAR-AT_linker | Formylglycinamide ribonucleotide amidotransferase linker domain | P74881 |
| PF18075 | FtsX_ECD | FtsX extracellular domain | P0AC30 |
| PF18076 | FGAR-AT_N | Formylglycinamide ribonucleotide amidotransferase N-terminal | P74881 |
| PF18081 | FANC_SAP | Fanconi anemia-associated nuclease SAP domain | Q9I2N0 |
| PF18109 | Fer4_24 | Ferredoxin I 4Fe-4S cluster domain | Q9P0L9 |
| PF18193 | Fibrillin_U_N | Fibrillin 1 unique N-terminal domain | P35555 |
| PF18288 | FAA_hydro_N_2 | Fumarylacetoacetase N-terminal domain 2 | Q92LT4 |
| PF18314 | FAS_I_H | Fatty acid synthase type I helical domain | P43098 |
| PF18325 | Fas_alpha_ACP | Fatty acid synthase subunit alpha Acyl carrier domain | P43098 |
| PF18371 | FAD_SOX | Flavin adenine dinucleotide (FAD)-dependent sulfhydryl oxidase | Q6IUU3 |
| PF18377 | FERM_F2 | FERM F2 acyl-CoA binding protein-like domain | B1ASP2 |
| PF18379 | FERM_F1 | FERM F1 ubiquitin-like domain | B1ASP2 |
| PF18382 | Formin_GBD_N | Formin N-terminal GBD | Q9Y613 |
| PF18447 | FN3_7 | Fibronectin type III domain | P16871 |
| PF18511 | F-box_5 | F-box | O04197 |
| PF18647 | Fungal_lectin_2 | Alpha-galactosyl-binding fungal lectin | |
| PF18890 | FANCL_d2 | FANCL UBC-like domain 2 | Q9NW38 |
| PF18891 | FANCL_d3 | FANCL UBC-like domain 3 | Q9NW38 |
| PF18913 | FBPase_C | Fructose-1-6-bisphosphatase, C-terminal domain | P09467 |
| PF18998 | Flg_new_2 | Divergent InlB B-repeat domain | |
| PF19036 | Fuz_longin_1 | First Longin domain of FUZ, MON1 and HPS1 | G0SGS3 |
| PF19037 | Fuz_longin_2 | Second Longin domain of FUZ, MON1 and HPS1 | G0SGS3 |
| PF19038 | Fuz_longin_3 | Third Longin domain of FUZ, MON1 and HPS1 | G0SGS3 |
| PF19270 | FBO_C | F-box only protein C-terminal region | |
| PF19309 | Frem_N | Frem protein N-terminal domain | |
| PF19333 | FAXC_N | Failed axon connections homolog N-terminus | |
| PF19421 | Fry_C | Furry protein C-terminal | |
| PF19579 | FtsL_2 | Bacteriodetes cell division protein (FtsL-like) | |
| PF19737 | FKTN_N | Fukutin N-terminal | |
| PF19745 | FUT8_N_cat | Alpha-(1,6)-fucosyltransferase N- and catalytic domains | Q9BYC5 |
| PF19998 | fvmX1 | FtsH ternary system domain X1 | |
| PF19999 | fvmX3 | FtsH ternary system domain X3 | |
| PF20000 | fvmX2 | FtsH ternary system domain X2 | |
| PF20002 | fvmX3-analog | FtsH ternary system domain X3-analog | |
| PF20003 | fvmX5 | FtsH ternary system domain X5 | |
| PF20004 | fvmX6 | FtsH ternary system domain X6 | |
| PF20005 | fvmX7 | FtsH ternary system domain X7 | |
| PF20006 | fvmYukDl_N | YukD-like N-terminal domain | |
| PF20007 | fvmRadSAM-pep | FtsH ternary system-associated peptide | |
| PF20011 | fvmJAB_N | JAB N-terminal domain | |
| PF20250 | FapA_N | Flagellar Assembly Protein A N-terminal region | |
| PF20483 | Flavi_NS5_thumb | Flavivirus RNA-directed RNA polymerase, thumb domain | Q91H74 |
| PF20684 | Fung_rhodopsin | Fungal rhodopsin domain | |
| PF20771 | FAM171A1-2-B_C | FAM171A1/A2/B C-terminal | |
| PF20813 | FhbB | Factor H binding protein B | |
| PF20820 | Fib-H_N | Fibroin heavy chain, N-terminal domain | |
| PF20865 | FAM186A-B_C | FAM186A/B, C-terminal | |
| PF20869 | FAM186A_PQQAQ | FAM186A, PQQAQ repeat | |
| PF20870 | FAM186A-B_N | FAM186A/B, N-terminal | |
| PF20907 | Flav_NS3-hel_C | Flavivirus NS3 helicase, C-terminal helical domain | |
| PF20937 | FHBP_N | Factor H binding protein, N-terminal | |
| PF20947 | Flu_PB2_1st | Influenza RNA polymerase PB2 N-terminal region | |
| PF20948 | Flu_PB2_2nd | Influenza RNA polymerase PB2 second domain | |
| PF20949 | Flu_PB2_3rd | Influenza RNA polymerase PB2 middle domain | |
| PF20950 | Flu_PB2_4th | Influenza RNA polymerase PB2 helical domain | |
| PF20951 | Flu_PB2_6th | Influenza RNA polymerase PB2 6th domain | |
| PF20952 | Flu_PB2_7th | Influenza RNA polymerase PB2 C-terminal domain | |
| PF21007 | FBF1 | Fas-binding factor 1 | |
| PF21021 | FAF1 | Fas-associated factor 1 | |
| PF21149 | FAS_pseudo-KR | Fatty acid synthase, pseudo-KR domain | |
| PF21158 | flgK_1st_1 | Flagellar hook-associated protein 1, D2-like domain | |
| PF21159 | FlgK_2nd | Flagellar hook-associated protein 1, D3 domain | |
| PF21165 | FGFR3_TM | Fibroblast growth factor receptor 3 transmembrane domain | |
| PF21168 | FkbO_Hyg5-like_N | Chorismatase FkbO/Hyg5-like, N-terminal | |
| PF21169 | Fan1_SAP | Fanconi-associated nuclease 1, SAP subdomain | |
| PF21170 | FAN1_TPR | Fanconi-associated nuclease 1, TPR domain | |
| PF21182 | FOG1-like_PR | Zinc finger protein ZFPM1-like, PR domain | |
| PF21211 | FkbH_N | FkbH, N-terminal domain | |
| PF21218 | Fpg-like_C | Formamidopyrimidine-DNA glycosylase-like, C-terminal domain | |
| PF21247 | Fic-like_C | Filamentation induced by cAMP protein Fic-like, C-terminal domain | |
| PF21272 | FYVE_CARP1-2 | E3 ubiquitin-protein ligase CARP1/2, FYVE/PHD zinc finger | |
| PF21315 | FAN1_HTH | FAN1, HTH domain | |
| PF21333 | FST_N | Follistatin, N-terminal | |
| PF21464 | flgE_D3 | Flagellar hook protein FlgE, D3 domain | |
| PF21477 | FERM_C_FAK1 | FAK1/PYK2, FERM domain C-lobe | |
| PF21489 | Fim1C-like_C | Fimbrium tip subunit Fim1C-like, C-terminal domain | |
| PF21504 | FLIC_barrel | Flagellin, barrel domain | |
| PF21514 | FimA-like_C | FimA-like major fimbrial subunit protein, C-terminal domain | |
| PF21546 | FGGY_C_2 | Carbohydrate kinase FGGY, C-terminal domain | |
| PF21553 | Formyl_trans_C_2 | Methionyl-tRNA formyltransferase, C-terminal domain | |
| PF21573 | ForC_N | Formin C, N-terminal domain | |
| PF21607 | FabD_helical_ins | [Acyl-carrier-protein] S-malonyltransferase, inserted helical domain | |
| PF21610 | FlgA_N | Flagellar protein FlgA, N-terminal domain-like | |
| PF21645 | FakA-like_M | Fatty acid kinase subunit A-like, middle domain | |
| PF21659 | Flavi_E_stem | Flavivirus envelope glycoprotein E, stem/anchor domain | |
| PF21685 | Fungal_virus_P2_N | Fungal virus Capsid protein, N-terminal domain | |
| PF21688 | FAD-depend_C | FAD-dependent protein, C-terminal domain-like | |
| PF21706 | FCSD_central | Sulfide dehydrogenase [flavocytochrome c] flavoprotein chain, central | |
| PF21926 | FeeM | N-acyl amino acid synthase FeeM | |
| PF21998 | FERM_C1_MyoVII | Myosin-X FERM PH domain-like | |
| PF22046 | FabMG | Enoyl-acyl carrier protein reductase FabMG | |
| PF22071 | FAP42_B2 | FAP42 domain B2 | |
| PF22072 | FAP42_B3 | FAP42 domain B3 | |
| PF22117 | Fer4_Nqo3 | NADH-quinone oxidoreductase subunit 3, ferredoxin-like domain | |
| PF22148 | Fervidolysin_NPro-like | Fervidolysin N-terminal prodomain | |
| PF22151 | Fer4_NDSU1 | NADH-ubiquinone oxidoreductase NDSU1/NuoG-like, 4Fe-4S domain | |
| PF22194 | F-93_WHD | F-93, winged-helix domain | |
| PF22199 | FKBP26_IF | FKBP26, IF domain | |
| PF22201 | FlaF_Ig-like | Conserved flagellar protein F, immunoglobulin-like domain | |
| PF22235 | FAS1_thioest_ins | Fatty acid synthase subunit beta, insertion domain | |
| PF22349 | Fervidolysin_SD2 | Fervidolysin, second beta-sandwich domain | |
| PF22367 | FlgE_3rd | Flagellar hook protein FlgE, third domain | |
| PF22370 | FliC-like_3rd | Flagellin, beta sheet domain | |
| PF22438 | FlgA_HD-like | Flagellar protein FlgA, HotDog domain-like | |
| PF22443 | FbpC-like_RD | FbpC-like, regulatory domain | |
| PF22449 | Fim1F_C | Fim1F, C-terminal domain | |
| PF22492 | FimA4_C | FimA4 pilin C-terminal domain | |
| PF22498 | FKBP-like_N | FKBP-like, N-terminal domain | |
| PF22510 | FlhF_N | Flagellar biosynthesis protein FlhF, N domain | |
| PF22513 | FitA-like_RHH | Antitoxin FitA-like, ribbon-helix-helix | |
| PF22592 | FCaBP_EF-hand | FCaBP EF-hand domain | |
| PF22607 | FAD_binding-like | FAD binding domain-like | |
| PF22609 | Fe_hydrogense_Fe-S_bd | Iron hydrogenase 1-like, iron-sulfur centre-binding domain | |
| PF22633 | F5_F8_type_C_2 | NedA-like, galactose-binding domain | |
| PF22636 | FlK | Fluoroacetyl-CoA-specific thioesterase | |
| PF22638 | FlgK_D1 | Flagellar hook-associated protein FlgK helical domain | |
| PF22689 | FGAR-AT_PurM_N-like | FGAR-AT PurM_N-like domain | |
| PF22690 | FAS_AT_central | Fatty acid synthase central AT domain | |
| PF22881 | FilE_C | FilE, C-terminal domain | |
| PF22888 | FIMAH | FIMAH domain | |
| PF22914 | Fibulin_C | Fibulin C-terminal Ig-like domain | |
| PF22921 | FKRP_N | Fukutin-related protein stem domain | |
| PF22986 | Fn3_ELFN | ELFN1/ELFN2, fibronectin type-III domain | |
| PF23003 | Fn1_2 | Fibronectin type I domain | |
| PF23008 | FN3_Tor_3rd | Tyrosine-protein kinase receptor torso, third FN3 domain | |
| PF23083 | FF_RHG35_4th | Rho GTPase-activating protein 35-like, FF domain | |
| PF23144 | Fn3_PTPRU | Receptor-type tyrosine-protein phosphatase U Fn3 domain | |
| PF23298 | FZ_RECK | RECK, frizzled-like domain | |
| PF23374 | Fn3_arc | Archaeal fibronectin-III type-like domain | |
| PF23376 | Fn3_VIN3 | VIN3-like, fibronectin type-III domain | |
| PF23398 | FAZ1_cons | FAZ1, conserved domain | |
| PF23404 | FAZ1_C | FAZ1, C-terminal | |
| PF23605 | FKS1_dom2 | 1,3-beta-glucan synthase component FKS1, second domain | |
| PF23649 | FKBP15 | FK506-binding protein 15-like domain | |
| PF24031 | FN3_IL27B_N | IL27B N-terminal FN3 domain | |
| PF24102 | FLAD1_M | FAD synthase, middle domain | |
| PF24151 | FlaX | FlaX | |
| PF24221 | Fn3_nematode | Nematode fibronectin type-III domain | |
| PF24301 | FraC | Filament integrity protein FraC | |
| PF24329 | FN-plug_TEN1-4 | Teneurin 1-4, FN-plug domain | |
| PF24347 | FIGL1_N | FIGL1 N-terminal domain | |
| PF24424 | FNG | FNG domain | |
| PF24469 | F54D1_6_C | F54D1.6, C-terminal domain | |
| PF24532 | FIBL-2 | Fibulin-2 domain | |
| PF24686 | FLQE3_permease | Fluoroquinolones export permease protein family | |
| PF24781 | FANCA_helical | FANCA helical domain | |
| PF24783 | FANCA_arcN | FANCA arcN subdomain | |
| PF24801 | FNIII-A_GpJ | Tip attachment protein J,FNIII-A domain | |