| HP protein | HP | Q6NSB4 | 3 |
| HSPE1-MOB4 readthrough | HSPE1-MOB4 | S4R3N1 | 3 |
| Hyaluronan and proteoglycan link protein 2 (Brain link protein 1) | HAPLN2 BRAL1 | Q9GZV7 | 3 |
| Hydrocephalus-inducing protein homolog | HYDIN HYDIN1 KIAA1864 | Q4G0P3 | 3 |
| IGH@ protein | IGH@ | Q6P089 | 3 |
| IGK@ protein | IGK@ | Q6PIL8 | 3 |
| IgLON family member 5 | IGLON5 | A6NGN9 | 3 |
| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCH9 | 3 |
| Immunglobulin heavy chain variable region (Fragment) | 0 | Q0ZCI1 | 3 |
| Immunoglobulin alpha Fc receptor (IgA Fc receptor) (CD antigen CD89) | FCAR CD89 | P24071 | 3 |
| Immunoglobulin heavy variable 1-3 | IGHV1-3 | A0A0C4DH29 | 3 |
| Immunoglobulin heavy variable 1/OR15-1 (non-functional) (Fragment) | IGHV1OR15-1 | A0A075B7D0 | 3 |
| 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 | P01774 | 3 |
| Immunoglobulin heavy variable 3-49 | IGHV3-49 | A0A0A0MS15 | 3 |
| Immunoglobulin heavy variable 4-28 | IGHV4-28 | A0A0C4DH34 | 3 |
| Immunoglobulin J chain (Fragment) | JCHAIN | D6RHJ6 | 3 |
| Immunoglobulin kappa variable 1-13 | IGKV1-13 | P0DP09 | 3 |
| Immunoglobulin kappa variable 1-33 (Ig kappa chain V-I region AU) (Ig kappa chain V-I region Ka) | IGKV1-33 | P01603 | 3 |
| Immunoglobulin kappa variable 1-37 (non-functional) (Immunoglobulin kappa variable 1D-37 (non-functional)) (Fragment) | IGKV1D-37 IGKV1-37 | A0A075B6S9 | 3 |
| Immunoglobulin kappa variable 1D-33 (Ig kappa chain V-I region AG) (Ig kappa chain V-I region Bi) (Ig kappa chain V-I region Lay) (Ig kappa chain V-I region Ni) (Ig kappa chain V-I region Rei) (Ig kappa chain V-I region Roy) (Ig kappa chain V-I region Scw) (Ig kappa chain V-I region WAT) | IGKV1D-33 | P01607 | 3 |
| Immunoglobulin kappa variable 1D-39 (Ig kappa chain V-I region Daudi) | IGKV1D-39 | P04432 | 3 |
| Immunoglobulin kappa variable 3D-11 | IGKV3D-11 | A0A0A0MRZ8 | 3 |
| Immunoglobulin kappa variable 3D-15 | IGKV3D-15 | A0A087WSY6 | 3 |
| Immunoglobulin kappa variable 4-1 (Ig kappa chain V-IV region B17) (Ig kappa chain V-IV region JI) (Ig kappa chain V-IV region Len) (Ig kappa chain V-IV region STH) | IGKV4-1 | P83593 | 3 |
| Immunoglobulin kappa variable 6D-21 | IGKV6D-21 | A0A0A0MT36 | 3 |
| 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 | P01707 | 3 |
| Immunoglobulin lambda variable 3-25 (Ig lambda chain V-IV region Hil) | IGLV3-25 | A0A075B6J4 | 3 |
| Immunoglobulin superfamily DCC subclass member 4 (Neighbor of punc e11) (Protein DDM36) (hDDM36) | IGDCC4 DDM36 KIAA1628 NOPE | Q8TDY8 | 3 |
| Immunoglobulin superfamily member 6 (IgSF6) (Protein DORA) | IGSF6 DORA | O95976 | 3 |
| Importin subunit beta-1 (Fragment) | KPNB1 | J3QKQ5 | 3 |
| Inactive dipeptidyl peptidase 10 (Dipeptidyl peptidase IV-related protein 3) (DPRP-3) (Dipeptidyl peptidase X) (DPP X) (Dipeptidyl peptidase-like protein 2) (DPL2) | DPP10 DPRP3 KIAA1492 | Q8N608 | 3 |
| Inactive rhomboid protein | 0 | B3KPT2 | 3 |
| InaD-like protein (cDNA FLJ59473, highly similar to InaD-like protein) | PATJ | B4DE90 | 3 |
| Indoleamine 2,3-dioxygenase 1 (IDO-1) (EC 1.13.11.52) (Indoleamine-pyrrole 2,3-dioxygenase) | IDO1 IDO INDO | P14902 | 3 |
| Inhibitor of Bruton tyrosine kinase (IBtk) | IBTK BTKI KIAA1417 | Q9P2D0 | 3 |
| Inositol 1,4,5-trisphosphate receptor-interacting protein-like 2 | ITPRIPL2 | Q3MIP1 | 3 |
| Inositol-trisphosphate 3-kinase B (EC 2.7.1.127) (Inositol 1,4,5-trisphosphate 3-kinase B) (IP3 3-kinase B) (IP3K B) (InsP 3-kinase B) | ITPKB | P27987 | 3 |
| Insulin growth factor-like family member 1 | IGFL1 UNQ644/PRO1274 | Q6UW32 | 3 |
| Insulin receptor substrate 1 (IRS-1) | IRS1 | P35568 | 3 |
| Insulin [Cleaved into: Insulin B chain; Insulin A chain] | INS | P01308 | 3 |
| Insulin-like growth factor I (IGF-I) (Mechano growth factor) (MGF) (Somatomedin-C) | IGF1 IBP1 | P05019 | 3 |
| Insulin-like growth factor type II receptor (Fragment) | IGF2R | A0N9R7 | 3 |
| Insulin-like growth factor-binding protein 1 (IBP-1) (IGF-binding protein 1) (IGFBP-1) (Placental protein 12) (PP12) | IGFBP1 IBP1 | P08833 | 3 |
| Integral membrane protein GPR137B (Fragment) | GPR137B | H0Y509 | 3 |
| Integrator complex subunit 12 (Int12) (PHD finger protein 22) | INTS12 PHF22 SBBI22 | Q96CB8 | 3 |
| Integrin alpha 3 isoform b, variant (Fragment) | 0 | Q59F03 | 3 |
| Integrin alpha-2 | ITGA2 | D6RG08 | 3 |
| Integrin alpha-2 | ITGA2 | E7EMF1 | 3 |
| Integrin alpha-D (ADB2) (CD11 antigen-like family member D) (Leukointegrin alpha D) (CD antigen CD11d) | ITGAD | Q13349 | 3 |
| Integrin alpha-V (Fragment) | ITGAV | H7BZG1 | 3 |
| Integrin beta | ITGB5 hCG_17803 | D3DNA1 | 3 |
| Integrin beta | ITGB4 | B7ZLD5 | 3 |
| Integrin beta | ITGB6 | E9PEE8 | 3 |
| Intercellular adhesion molecule 1 | ICAM1 | Q5NKV8 | 3 |
| Interferon regulatory factor 2-binding protein 1 (IRF-2-binding protein 1) (IRF-2BP1) (Probable E3 ubiquitin-protein ligase IRF2BP1) (EC 2.3.2.27) (Probable RING-type E3 ubiquitin transferase IRF2BP1) | IRF2BP1 | Q8IU81 | 3 |
| Interferon regulatory factor 7 (IRF-7) | IRF7 | Q92985 | 3 |
| Interferon-induced GTP-binding protein Mx1 (Fragment) | MX1 | H9KVC3 | 3 |
| Interferon-induced protein with tetratricopeptide repeats 1 (IFIT-1) (Interferon-induced 56 kDa protein) (IFI-56K) (P56) | IFIT1 G10P1 IFI56 IFNAI1 ISG56 | D3DR31 | 3 |
| Interferon-induced transmembrane protein 2 (Fragment) | IFITM2 | H7BYV1 | 3 |
| Interleukin-1 receptor-associated kinase 4 (IRAK-4) (EC 2.7.11.1) (Renal carcinoma antigen NY-REN-64) | IRAK4 | Q9NWZ3 | 3 |
| Interleukin-11 (IL-11) (Adipogenesis inhibitory factor) (AGIF) (Oprelvekin) | IL11 | P20809 | 3 |
| Intraflagellar transport protein 52 homolog (Protein NGD5 homolog) | IFT52 C20orf9 NGD5 CGI-53 | Q9Y366 | 3 |
| Inversin (Inversion of embryo turning homolog) (Nephrocystin-2) | INVS INV NPHP2 | Q9Y283 | 3 |
| IQ and AAA domain-containing protein 1-like (IQ and AAA domain-containing protein 1 pseudogene 1) | IQCA1L IQCA1P1 | A6NCM1 | 3 |
| Iron-sulfur cluster assembly 2 homolog, mitochondrial (HESB-like domain-containing protein 1) | ISCA2 HBLD1 | Q86U28 | 3 |
| Iron-sulfur cluster assembly enzyme ISCU, mitochondrial (NifU-like N-terminal domain-containing protein) (NifU-like protein) | ISCU NIFUN | Q9H1K1 | 3 |
| Isocitrate dehydrogenase [NADP] cytoplasmic (Fragment) | IDH1 | C9J4N6 | 3 |
| Isocitrate dehydrogenase [NADP] cytoplasmic (Fragment) | IDH1 | C9JJE5 | 3 |
| Isocitrate dehydrogenase [NAD] subunit alpha, mitochondrial | IDH3A | H0YL72 | 3 |
| Isoleucyl-tRNA synthetase, cytoplasmic variant (Fragment) | 0 | Q59G75 | 3 |
| IST1 homolog (Fragment) | IST1 | H3BRE2 | 3 |
| ITGA9 protein | 0 | Q8N6H6 | 3 |
| JAK1 protein (Fragment) | JAK1 | Q8IV82 | 3 |
| Junction plakoglobin (Fragment) | JUP | C9JTX4 | 3 |
| Junctophilin-3 (JP-3) (Junctophilin type 3) (Trinucleotide repeat-containing gene 22 protein) | JPH3 JP3 TNRC22 | Q8WXH2 | 3 |
| Kallikrein-13 (EC 3.4.21.-) (Kallikrein-like protein 4) (KLK-L4) | KLK13 KLKL4 | Q9UKR3 | 3 |
| Kazal-type serine protease inhibitor domain-containing protein 1 | KAZALD1 FKSG28 FKSG40 UNQ2945/PRO21184 | Q96I82 | 3 |
| KDEL motif-containing protein 1 (Endoplasmic reticulum resident protein 58) (ER protein 58) (ERp58) | KDELC1 EP58 UNQ1910/PRO4357 | Q6UW63 | 3 |
| Kelch domain-containing protein 10 | KLHDC10 KIAA0265 | Q6PID8 | 3 |
| Kelch repeat and BTB domain-containing protein 6 | KBTBD6 | Q86V97 | 3 |
| Kelch-like protein 25 (Ectoderm-neural cortex protein 2) (ENC-2) | KLHL25 ENC2 | Q9H0H3 | 3 |
| Kelch-like protein 36 | KLHL36 C16orf44 | Q8N4N3 | 3 |
| Kelch-like protein 6 | KLHL6 | Q8WZ60 | 3 |
| Kelch-like protein 9 | KLHL9 KIAA1354 | Q9P2J3 | 3 |
| Keratin, type I cytoskeletal 13 (Fragment) | KRT13 | K7EMD9 | 3 |
| Keratin, type I cytoskeletal 40 (Cytokeratin-40) (CK-40) (Keratin-40) (K40) (Type I hair keratin Ka36) | KRT40 KA36 | Q6A162 | 3 |
| Keratin, type II cytoskeletal 4 (Cytokeratin-4) (CK-4) (Keratin-4) (K4) (Type-II keratin Kb4) | KRT4 CYK4 | F8VS64 | 3 |
| Keratin, type II cytoskeletal 79 (Fragment) | KRT79 | H0YID6 | 3 |
| Keratin-associated protein 13-2 | KRTAP13-2 KAP13.2 | Q52LG2 | 3 |
| Keratin-associated protein 9-9 (Keratin-associated protein 9-5) (Keratin-associated protein 9.5) (Keratin-associated protein 9.9) (Ultrahigh sulfur keratin-associated protein 9.9) | KRTAP9-9 KAP9.5 KAP9.9 KRTAP9-5 KRTAP9.5 KRTAP9.9 | Q9BYP9 | 3 |
| Keratocan (KTN) (Keratan sulfate proteoglycan keratocan) | KERA SLRR2B | O60938 | 3 |
| KIAA0063 protein | KIAA0063 | Q6IB81 | 3 |
| KIAA0103 variant (Fragment) | 0 | Q53HG5 | 3 |
| KIAA0118 protein (Fragment) | 0 | Q96GX3 | 3 |
| KIAA1609 protein, isoform CRA_a | KIAA1609 hCG_39793 | D3DUL8 | 3 |
| Kinase suppressor of Ras 1 | KSR1 KSR | Q8IVT5 | 3 |
| Kinesin light chain 1 | KLC1 | G3V5R9 | 3 |
| Kinesin-like protein | 0 | B0AZS5 | 3 |
| Kinesin-like protein | 0 | B4DM85 | 3 |
| Kinesin-like protein KIF24 | KIF24 C9orf48 | Q5T7B8 | 3 |