| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCJ6 | 1 |
| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCG9 | 1 |
| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCI2 | 1 |
| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCI3 | 1 |
| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCH4 | 1 |
| Immunglobulin light chain variable region (Fragment) | 0 | Q8TE63 | 1 |
| Immunoglobulin heavy constant gamma 1 (Fragment) | IGHG1 | A0A0A0MS07 | 1 |
| Immunoglobulin heavy variable 1-24 | IGHV1-24 | A0A0C4DH33 | 1 |
| Immunoglobulin heavy variable 1-58 | IGHV1-58 | A0A0C4DH39 | 1 |
| Immunoglobulin heavy variable 1/OR15-9 (non-functional) (Fragment) | IGHV1OR15-9 | A0A0B4J2B8 | 1 |
| Immunoglobulin heavy variable 2-70 (Ig heavy chain V-II region COR) (Ig heavy chain V-II region DAW) (Ig heavy chain V-II region OU) (Ig heavy chain V-II region SESS) | IGHV2-70 | P01815 | 1 |
| Immunoglobulin heavy variable 3-13 (Ig heavy chain V-III region BRO) | IGHV3-13 | A0A0A0MS11 | 1 |
| Immunoglobulin heavy variable 3-16 (non-functional) (Fragment) | IGHV3-16 | A0A0C4DH30 | 1 |
| Immunoglobulin heavy variable 3-23 (Ig heavy chain V-III region LAY) (Ig heavy chain V-III region POM) (Ig heavy chain V-III region TEI) (Ig heavy chain V-III region TIL) (Ig heavy chain V-III region TUR) (Ig heavy chain V-III region VH26) (Ig heavy chain V-III region WAS) (Ig heavy chain V-III region ZAP) | IGHV3-23 | P01775 | 1 |
| Immunoglobulin heavy variable 3-23 (Ig heavy chain V-III region LAY) (Ig heavy chain V-III region POM) (Ig heavy chain V-III region TEI) (Ig heavy chain V-III region TIL) (Ig heavy chain V-III region TUR) (Ig heavy chain V-III region VH26) (Ig heavy chain V-III region WAS) (Ig heavy chain V-III region ZAP) | IGHV3-23 | P01778 | 1 |
| Immunoglobulin J chain (Fragment) | JCHAIN | C9JA05 | 1 |
| Immunoglobulin kappa joining 5 (Fragment) | IGKJ5 | A0A0A0MTA3 | 1 |
| Immunoglobulin kappa variable 1-33 (Ig kappa chain V-I region AU) (Ig kappa chain V-I region Ka) | IGKV1-33 | A0A087WZH9 | 1 |
| Immunoglobulin kappa variable 1D-17 | IGKV1D-17 | A0A075B6S4 | 1 |
| Immunoglobulin kappa variable 2D-26 | IGKV2D-26 | A0A0A0MRZ7 | 1 |
| Immunoglobulin kappa variable 2D-29 | IGKV2D-29 | A0A087X0P6 | 1 |
| Immunoglobulin kappa variable 2D-30 | IGKV2D-30 | A0A075B6S6 | 1 |
| Immunoglobulin kappa variable 5-2 (Ig kappa chain V region EV15) | IGKV5-2 | P06315 | 1 |
| Immunoglobulin lambda constant 3 (Ig lambda chain C region DOT) (Ig lambda chain C region NEWM) (Ig lambda-3 chain C regions) | IGLC3 | A0A075B6L0 | 1 |
| Immunoglobulin lambda variable 1-51 (Ig lambda chain V-I region BL2) (Ig lambda chain V-I region EPS) (Ig lambda chain V-I region NEW) (Ig lambda chain V-I region NIG-64) | IGLV1-51 | P06888 | 1 |
| Immunoglobulin lambda variable 2-11 (Ig gamma lambda chain V-II region DOT) (Ig lambda chain V-II region BOH) (Ig lambda chain V-II region BUR) (Ig lambda chain V-II region NIG-58) (Ig lambda chain V-II region TRO) (Ig lambda chain V-II region WIN) | IGLV2-11 | P80422 | 1 |
| Immunoglobulin lambda variable 2-11 (Ig gamma lambda chain V-II region DOT) (Ig lambda chain V-II region BOH) (Ig lambda chain V-II region BUR) (Ig lambda chain V-II region NIG-58) (Ig lambda chain V-II region TRO) (Ig lambda chain V-II region WIN) | IGLV2-11 | P01712 | 1 |
| Immunoglobulin lambda variable 2-11 (Ig gamma lambda chain V-II region DOT) (Ig lambda chain V-II region BOH) (Ig lambda chain V-II region BUR) (Ig lambda chain V-II region NIG-58) (Ig lambda chain V-II region TRO) (Ig lambda chain V-II region WIN) | IGLV2-11 | P01713 | 1 |
| Immunoglobulin lambda variable 2-11 (Ig gamma lambda chain V-II region DOT) (Ig lambda chain V-II region BOH) (Ig lambda chain V-II region BUR) (Ig lambda chain V-II region NIG-58) (Ig lambda chain V-II region TRO) (Ig lambda chain V-II region WIN) | IGLV2-11 | A0A075B6K3 | 1 |
| Immunoglobulin lambda variable 2-8 (Ig lambda chain V-II region BO) (Ig lambda chain V-II region MGC) | IGLV2-8 | P01710 | 1 |
| Immunoglobulin lambda variable 3-1 (Ig lambda chain V-IV region Bau) (Ig lambda chain V-IV region MOL) (Ig lambda chain V-IV region X) | IGLV3-1 | P01716 | 1 |
| Immunoglobulin lambda variable 3-16 | IGLV3-16 | A0A075B6K0 | 1 |
| Immunoglobulin lambda variable 5-45 | IGLV5-45 | A0A087WSX0 | 1 |
| Immunoglobulin lambda variable 5-52 | IGLV5-52 | A0A0A0MRZ9 | 1 |
| Immunoglobulin lambda variable 6-57 (Ig lambda chain V-VI region AR) (Ig lambda chain V-VI region EB4) (Ig lambda chain V-VI region NIG-48) (Ig lambda chain V-VI region SUT) (Ig lambda chain V-VI region WLT) | IGLV6-57 | P06318 | 1 |
| Immunoglobulin superfamily containing leucine-rich repeat protein 2 (Leucine-rich repeat domain and immunoglobulin domain-containing axon extension protein) | ISLR2 KIAA1465 LINX UNQ1885/PRO4329 | Q6UXK2 | 1 |
| Immunoglobulin superfamily member 10 (Fragment) | IGSF10 | H7C4M2 | 1 |
| Immunoglobulin superfamily member 21 (IgSF21) | IGSF21 | Q96ID5 | 1 |
| Immunoglobulin superfamily member 22 (IgSF22) | IGSF22 | Q8N9C0 | 1 |
| Immunoglobulin superfamily member 23 (Fragment) | IGSF23 | H0Y773 | 1 |
| Immunoglobulin superfamily member 5 (IgSF5) (Junctional adhesion molecule 4) (JAM-4) | IGSF5 JAM4 | Q9NSI5 | 1 |
| Immunoglobulin-like domain-containing receptor 2 | ILDR2 | E9PNU3 | 1 |
| Immunogobulin kappa, VJ region (Fragment) | 0 | A2NH54 | 1 |
| Importin subunit alpha-1 | KPNA2 | J3QL07 | 1 |
| Importin subunit alpha-3 (Fragment) | KPNA4 | H7C4F6 | 1 |
| Importin subunit alpha-5 (Fragment) | KPNA1 | C9J352 | 1 |
| Importin subunit alpha-7 (Fragment) | KPNA6 | Q5TFJ7 | 1 |
| Importin subunit alpha-8 (Karyopherin subunit alpha-7) | KPNA7 | A9QM74 | 1 |
| Importin subunit beta-1 (Importin-90) (Karyopherin subunit beta-1) (Nuclear factor p97) (Pore targeting complex 97 kDa subunit) (PTAC97) | KPNB1 NTF97 | B7ZAV6 | 1 |
| Importin-11 | IPO11 | F8WDV0 | 1 |
| Importin-4 | IPO4 | H0YK93 | 1 |
| Importin-4 (Fragment) | IPO4 | H0YN07 | 1 |
| Importin-5 (Fragment) | IPO5 | C9J875 | 1 |
| Inactive glycosyltransferase 25 family member 3 (Fragment) | CERCAM | B7ZBT0 | 1 |
| Inactive heparanase-2 (Hpa2) | HPSE2 HPA2 | Q8WWQ2 | 1 |
| Inactive serine protease PAMR1 (Peptidase domain-containing protein associated with muscle regeneration 1) (Regeneration-associated muscle protease homolog) | PAMR1 RAMP FP938 UNQ699/PRO1344 | Q6UXH9 | 1 |
| Inactive serine/threonine-protein kinase PLK5 (Polo-like kinase 5) (PLK-5) | PLK5 PLK5P FG060302 | Q496M5 | 1 |
| Inactive serine/threonine-protein kinase TEX14 (Protein kinase-like protein SgK307) (Sugen kinase 307) (Testis-expressed sequence 14) (Testis-expressed sequence 14 protein) | TEX14 SGK307 | Q8IWB6 | 1 |
| Inactive tyrosine-protein kinase 7 (Fragment) | PTK7 | C9JQR6 | 1 |
| InaD-like protein | PATJ | A0A087WUZ6 | 1 |
| InaD-like protein | PATJ | A0A0X1KG69 | 1 |
| Indolethylamine N-methyltransferase (Indolamine N-methyltransferase) (EC 2.1.1.49) (EC 2.1.1.96) (Aromatic alkylamine N-methyltransferase) (Amine N-methyltransferase) (Arylamine N-methyltransferase) (Thioether S-methyltransferase) (TEMT) | INMT | O95050 | 1 |
| Inhibitor of Bruton tyrosine kinase (Fragment) | IBTK | H0Y9N7 | 1 |
| Inhibitor of growth protein 1 | ING1 | Q9UK53 | 1 |
| Inhibitor of growth protein 3 (p47ING3) | ING3 HSPC301 | Q9NXR8 | 1 |
| Inhibitor of growth protein 4 (p29ING4) | ING4 My036 | Q9UNL4 | 1 |
| Inhibitor of growth protein 5 (p28ING5) | ING5 | Q8WYH8 | 1 |
| Inhibitor of nuclear factor kappa-B kinase subunit beta | IKBKB | E5RFT3 | 1 |
| INO80 complex subunit E (Coiled-coil domain-containing protein 95) | INO80E CCDC95 | Q8NBZ0 | 1 |
| Inorganic pyrophosphatase 2, mitochondrial (EC 3.6.1.1) (Pyrophosphatase SID6-306) (Pyrophosphate phospho-hydrolase 2) (PPase 2) | PPA2 HSPC124 | F8WDN9 | 1 |
| Inosine triphosphate pyrophosphatase (ITPase) (Inosine triphosphatase) (EC 3.6.1.9) (Non-canonical purine NTP pyrophosphatase) (Non-standard purine NTP pyrophosphatase) (Nucleoside-triphosphate diphosphatase) (Nucleoside-triphosphate pyrophosphatase) (NTPase) (Putative oncogene protein hlc14-06-p) | ITPA C20orf37 My049 OK/SW-cl.9 | Q9BYX0 | 1 |
| Inositol 1,4,5-trisphosphate receptor type 1 (IP3 receptor isoform 1) (IP3R 1) (InsP3R1) (Type 1 inositol 1,4,5-trisphosphate receptor) (Type 1 InsP3 receptor) | ITPR1 INSP3R1 | E7EPX7 | 1 |
| Inositol 1,4,5-trisphosphate receptor type 3 variant (Fragment) | 0 | Q59ES2 | 1 |
| Inositol hexakisphosphate and diphosphoinositol-pentakisphosphate kinase 1 (Fragment) | PPIP5K1 | H7C436 | 1 |
| Inositol hexakisphosphate kinase 3 (InsP6 kinase 3) (EC 2.7.4.21) (Inositol hexaphosphate kinase 3) | IP6K3 IHPK3 | Q96PC2 | 1 |
| Inositol monophosphatase 1 (IMP 1) (IMPase 1) (EC 3.1.3.25) (D-galactose 1-phosphate phosphatase) (EC 3.1.3.94) (Inositol-1(or 4)-monophosphatase 1) (Lithium-sensitive myo-inositol monophosphatase A1) | IMPA1 IMPA | B7Z6Q4 | 1 |
| Inositol monophosphatase 2 | IMPA2 | K7EL65 | 1 |
| Inositol monophosphatase 3 (Fragment) | IMPAD1 | H0YB38 | 1 |
| Inositol polyphosphate 1-phosphatase (Fragment) | INPP1 | E7ENF2 | 1 |
| Inositol polyphosphate 1-phosphatase (Fragment) | INPP1 | C9J128 | 1 |
| Inositol polyphosphate 5-phosphatase K | INPP5K | C9JQW8 | 1 |
| Inositol polyphosphate 5-phosphatase K (EC 3.1.3.56) (Skeletal muscle and kidney-enriched inositol phosphatase) | INPP5K PPS SKIP | Q9BT40 | 1 |
| Inositol polyphosphate multikinase (EC 2.7.1.151) (Inositol 1,3,4,6-tetrakisphosphate 5-kinase) | IPMK IMPK | Q8NFU5 | 1 |
| Inositol polyphosphate-5-phosphatase (Fragment) | INPP5A | Q9C055 | 1 |
| Inositol-pentakisphosphate 2-kinase (EC 2.7.1.158) (IPK1 homolog) (Inositol-1,3,4,5,6-pentakisphosphate 2-kinase) (Ins(1,3,4,5,6)P5 2-kinase) (InsP5 2-kinase) | IPPK C9orf12 | Q9H8X2 | 1 |
| Inositol-trisphosphate 3-kinase A (EC 2.7.1.127) (Inositol 1,4,5-trisphosphate 3-kinase A) (IP3 3-kinase A) (IP3K A) (InsP 3-kinase A) | ITPKA | P23677 | 1 |
| INPP1 protein (Inositol polyphosphate-1-phosphatase) (Inositol polyphosphate-1-phosphatase isoform 1) (Inositol polyphosphate-1-phosphatase, isoform CRA_a) (Putative uncharacterized protein INPP1) | INPP1 hCG_24794 | Q6IBG4 | 1 |
| Insulin receptor (Fragment) | 0 | A4ZPI2 | 1 |
| Insulin receptor-related protein (IRR) (EC 2.7.10.1) (IR-related receptor) [Cleaved into: Insulin receptor-related protein alpha chain; Insulin receptor-related protein beta chain] | INSRR IRR | P14616 | 1 |
| Insulin, isoform 2 (INS-IGF2 readthrough transcript protein) | INS-IGF2 | F8WCM5 | 1 |
| Insulin-degrading enzyme (EC 3.4.24.56) (Abeta-degrading protease) (Insulin protease) (Insulinase) (Insulysin) | IDE | Q5T5N2 | 1 |
| Insulin-degrading enzyme (Fragment) | IDE | Q5T5N3 | 1 |
| Insulin-like 3 (Leydig insulin-like peptide) (Ley-I-L) (Relaxin-like factor) [Cleaved into: Insulin-like 3 B chain; Insulin-like 3 A chain] | INSL3 RLF RLNL | P51460 | 1 |
| Insulin-like growth factor 1 receptor (Fragment) | IGF1R | H0YNR0 | 1 |
| Insulin-like growth factor binding protein 3 (Insulin-like growth factor-binding protein 3) | IGFBP3 | A6XND0 | 1 |
| Insulin-like growth factor binding protein 3 isoform b (Insulin-like growth factor-binding protein 3) | IGFBP3 | A6XND1 | 1 |
| Insulin-like growth factor binding protein 3, isoform CRA_b (Insulin-like growth factor-binding protein 3) (cDNA FLJ43234 fis, clone HCHON2002964, highly similar to Insulin-like growth factor-binding protein 3) | IGFBP3 hCG_1735376 | B3KWK7 | 1 |
| Insulin-like growth factor-binding protein 2 | IGFBP2 | C9JMY1 | 1 |
| Insulin-like growth factor-binding protein 3 (Fragment) | IGFBP3 | C9JMX4 | 1 |
| Insulin-like growth factor-binding protein 3 (Fragment) | IGFBP3 | H0Y485 | 1 |