| KH domain-containing, RNA-binding, signal transduction-associated protein 3 (RNA-binding protein T-Star) (Sam68-like mammalian protein 2) (SLM-2) (Sam68-like phosphotyrosine protein) | KHDRBS3 SALP SLM2 | O75525 | 4 |
| KIAA1033 protein | KIAA1033 | B7ZKT9 | 4 |
| Kinesin-like protein | KIF5B hCG_37538 | D3DRX6 | 4 |
| Kinesin-like protein (Fragment) | KIF5B | Q6P164 | 4 |
| Kinesin-like protein KIF21B | KIF21B KIAA0449 | O75037 | 4 |
| KRT8 protein (Fragment) | KRT8 | Q969I0 | 4 |
| L-plastin variant (Fragment) | 0 | Q53FI1 | 4 |
| La-related protein 6 (Acheron) (Achn) (La ribonucleoprotein domain family member 6) | LARP6 | Q9BRS8 | 4 |
| Lactadherin (Fragment) | MFGE8 | H0YKS8 | 4 |
| Lactoperoxidase (LPO) (EC 1.11.1.7) (Salivary peroxidase) (SPO) | LPO SAPX | P22079 | 4 |
| Lactosylceramide 4-alpha-galactosyltransferase (EC 2.4.1.228) (Alpha-1,4-N-acetylglucosaminyltransferase) (Alpha-1,4-galactosyltransferase) (Alpha4Gal-T1) (CD77 synthase) (Globotriaosylceramide synthase) (Gb3 synthase) (P1/Pk synthase) (UDP-galactose:beta-D-galactosyl-beta1-R 4-alpha-D-galactosyltransferase) | A4GALT A14GALT A4GALT1 | Q9NPC4 | 4 |
| Laminin alpha 5 chain (Fragment) | 0 | O75079 | 4 |
| Laminin alpha-3 chain variant 1 | LAMA3 | B0YJ32 | 4 |
| Laminin subunit alpha-5 (Laminin-10 subunit alpha) (Laminin-11 subunit alpha) (Laminin-15 subunit alpha) | LAMA5 KIAA0533 KIAA1907 | Q5U4N9 | 4 |
| LAMP1 protein variant (Fragment) | 0 | Q59FZ0 | 4 |
| Large neutral amino acids transporter 1 (Fragment) | SLC7A5 | Q2MCL6 | 4 |
| Lebercilin-like protein (Leber congenital amaurosis 5-like protein) | LCA5L C21orf13 | O95447 | 4 |
| Leucine zipper putative tumor suppressor 3 (ProSAP-interacting protein 1) (ProSAPiP1) | LZTS3 KIAA0552 PROSAPIP1 | O60299 | 4 |
| Leucine-rich melanocyte differentiation-associated protein | LRMDA C10orf11 CDA017 | Q9H2I8 | 4 |
| Leucine-rich repeat and guanylate kinase domain-containing protein | LRGUK | Q96M69 | 4 |
| Leucine-rich repeat-containing protein 20 | LRRC20 UNQ2429/PRO4989 | Q8TCA0 | 4 |
| Leucine-rich repeat-containing protein 25 (Monocyte and plasmacytoid-activated protein) | LRRC25 MAPA UNQ6169/PRO20174 | Q8N386 | 4 |
| Leucine-rich repeat-containing protein 26 (BK channel auxiliary gamma subunit LRRC26) (Cytokeratin-associated protein in cancer) | LRRC26 CAPC | Q2I0M4 | 4 |
| Leucine-rich repeat-containing protein 32 (Garpin) (Glycoprotein A repetitions predominant) (GARP) | LRRC32 D11S833E GARP | Q14392 | 4 |
| Leucine-rich repeat-containing protein 37A3 | LRRC37A3 KIAA0563 | O60309 | 4 |
| Leucine-rich repeat-containing protein 75A (Leucine-rich repeat-containing protein FAM211A) | LRRC75A C17orf76 FAM211A | Q8NAA5 | 4 |
| Leukocyte immunoglobulin-like receptor subfamily B member 2 (LIR-2) (Leukocyte immunoglobulin-like receptor 2) (CD85 antigen-like family member D) (Immunoglobulin-like transcript 4) (ILT-4) (Monocyte/macrophage immunoglobulin-like receptor 10) (MIR-10) (CD antigen CD85d) | LILRB2 ILT4 LIR2 MIR10 | Q8N423 | 4 |
| Leukocyte receptor cluster member 8 | LENG8 KIAA1932 | Q96PV6 | 4 |
| Leukocyte-associated immunoglobulin-like receptor 2 (LAIR-2) (CD antigen CD306) | LAIR2 CD306 | Q6ISS4 | 4 |
| Leukosialin (Galactoglycoprotein) (GALGP) (Leukocyte sialoglycoprotein) (Sialophorin) (CD antigen CD43) | SPN CD43 | A8K9B1 | 4 |
| LIM and calponin homology domains-containing protein 1 (Fragment) | LIMCH1 | H0Y8P3 | 4 |
| LIM domain and actin-binding protein 1 | LIMA1 | F8VQE1 | 4 |
| Limbin (Ellis-van Creveld syndrome protein 2) (EVC2) | EVC2 LBN | Q86UK5 | 4 |
| Lipoprotein, Lp(A) | LPA | Q1HP67 | 4 |
| LON peptidase N-terminal domain and RING finger protein 1 (RING finger protein 191) | LONRF1 RNF191 | Q17RB8 | 4 |
| Lon protease homolog, mitochondrial (EC 3.4.21.-) (Lon protease-like protein) (LONP) (Mitochondrial ATP-dependent protease Lon) (Serine protease 15) | LONP1 | B3KU28 | 4 |
| Low-density lipoprotein receptor (Fragment) | LDLR | J3KMZ9 | 4 |
| Low-density lipoprotein receptor-related protein 12 (LRP-12) (Suppressor of tumorigenicity 7 protein) | LRP12 ST7 | Q9Y561 | 4 |
| LRP protein (Fragment) | LRP | Q6LAF4 | 4 |
| LRRN4 C-terminal-like protein | LRRN4CL UNQ728/PRO1410 | Q8ND94 | 4 |
| Lymphocyte antigen 6 complex locus protein G6f | LY6G6F C6orf21 G6F LY6G6D NG32 | Q5SQ64 | 4 |
| Lysine-specific demethylase 6B (EC 1.14.11.-) (JmjC domain-containing protein 3) (Jumonji domain-containing protein 3) (Lysine demethylase 6B) | KDM6B JMJD3 KIAA0346 | O15054 | 4 |
| Lysophosphatidic acid receptor 3 (LPA receptor 3) (LPA-3) (Lysophosphatidic acid receptor Edg-7) | LPAR3 EDG7 LPA3 | Q9UBY5 | 4 |
| Lysosome membrane protein 2 | SCARB2 | D6RDG0 | 4 |
| M6PR protein | M6PR | Q6I9U3 | 4 |
| Macrophage colony-stimulating factor 1 receptor (CSF-1 receptor) (CSF-1-R) (CSF-1R) (M-CSF-R) (EC 2.7.10.1) (Proto-oncogene c-Fms) (CD antigen CD115) | CSF1R FMS | P07333 | 4 |
| Major prion protein (Fragment) | PRNP | D4P3Q7 | 4 |
| MAP7 domain-containing protein 2 | MAP7D2 | Q96T17 | 4 |
| MARVEL domain-containing protein 1 | MARVELD1 MRVLDC1 | Q9BSK0 | 4 |
| Matrilin-4 | MATN4 | O95460 | 4 |
| Matrin-3 | MATR3 | D6REM6 | 4 |
| Matrix metalloproteinase-25 (MMP-25) (EC 3.4.24.-) (Leukolysin) (Membrane-type matrix metalloproteinase 6) (MT-MMP 6) (MTMMP6) (Membrane-type-6 matrix metalloproteinase) (MT6-MMP) (MT6MMP) | MMP25 MMP20 MMPL1 MT6MMP | Q9NPA2 | 4 |
| Mediator of RNA polymerase II transcription subunit 15 (Activator-recruited cofactor 105 kDa component) (ARC105) (CTG repeat protein 7a) (Mediator complex subunit 15) (Positive cofactor 2 glutamine/Q-rich-associated protein) (PC2 glutamine/Q-rich-associated protein) (TPA-inducible gene 1 protein) (TIG-1) (Trinucleotide repeat-containing gene 7 protein) | MED15 ARC105 CTG7A PCQAP TIG1 TNRC7 | Q96RN5 | 4 |
| Mediator of RNA polymerase II transcription subunit 16 (Mediator complex subunit 16) (Thyroid hormone receptor-associated protein 5) (Thyroid hormone receptor-associated protein complex 95 kDa component) (Trap95) (Vitamin D3 receptor-interacting protein complex 92 kDa component) (DRIP92) | MED16 DRIP92 THRAP5 | Q9Y2X0 | 4 |
| Mediator of RNA polymerase II transcription subunit 17 (Activator-recruited cofactor 77 kDa component) (ARC77) (Cofactor required for Sp1 transcriptional activation subunit 6) (CRSP complex subunit 6) (Mediator complex subunit 17) (Thyroid hormone receptor-associated protein complex 80 kDa component) (Trap80) (Transcriptional coactivator CRSP77) (Vitamin D3 receptor-interacting protein complex 80 kDa component) (DRIP80) | MED17 ARC77 CRSP6 DRIP77 DRIP80 TRAP80 | Q9NVC6 | 4 |
| Mediator of RNA polymerase II transcription subunit 6 (Activator-recruited cofactor 33 kDa component) (ARC33) (Mediator complex subunit 6) (hMed6) (Renal carcinoma antigen NY-REN-28) | MED6 ARC33 | O75586 | 4 |
| Melanoma-associated antigen C1 (Cancer/testis antigen 7.1) (CT7.1) (MAGE-C1 antigen) | MAGEC1 | O60732 | 4 |
| Melanoma-associated antigen D2 | MAGED2 | Q5H909 | 4 |
| Membrane cofactor protein (Fragment) | CD46 | R4GN18 | 4 |
| Membrane-associated transporter protein (Melanoma antigen AIM1) (Protein AIM-1) (Solute carrier family 45 member 2) | SLC45A2 AIM1 MATP | Q9UMX9 | 4 |
| Membrane-spanning 4-domains subfamily A member 10 (CD20 antigen-like 7) | MS4A10 CD20L7 MS4A9 | Q96PG2 | 4 |
| Menin | MEN1 SCG2 | O00255 | 4 |
| Metalloendopeptidase (EC 3.4.24.-) (Fragment) | 0 | Q59F71 | 4 |
| Metaxin-2 (Fragment) | MTX2 | C9JAZ1 | 4 |
| Methylmalonic aciduria type A protein, mitochondrial (EC 3.6.-.-) | MMAA | Q8IVH4 | 4 |
| Methyltransferase-like protein 16 (EC 2.1.1.-) (Methyltransferase 10 domain-containing protein) | METTL16 METT10D | Q86W50 | 4 |
| Methyltransferase-like protein 7B (EC 2.1.1.-) | METTL7B UNQ594/PRO1180 | Q6UX53 | 4 |
| MHC class I antigen | HLA-B | C0KXH2 | 4 |
| MHC class I antigen (Fragment) | HLA-A | D9UAY2 | 4 |
| Microtubule-associated protein 1A | MAP1A | E9PGC8 | 4 |
| Microtubule-associated serine/threonine-protein kinase 2 (EC 2.7.11.1) | MAST2 KIAA0807 MAST205 | Q6P0Q8 | 4 |
| MIF4G domain-containing protein (SLBP-interacting protein 1) (hSLIP1) | MIF4GD SLIP1 | A9UHW6 | 4 |
| Mirror-image polydactyly gene 1 protein | MIPOL1 | Q8TD10 | 4 |
| MIT domain-containing protein 1 (Fragment) | MITD1 | B8ZZL5 | 4 |
| Mitochondrial chaperone BCS1 (h-BCS1) (BCS1-like protein) | BCS1L BCS1 | Q9Y276 | 4 |
| Mitochondrial heat shock 60kD protein 1 variant 1 | HSPD1 | B3GQS7 | 4 |
| Mitochondrial import inner membrane translocase subunit Tim10 | TIMM10 TIM10 | P62072 | 4 |
| Mitochondrial ornithine transporter 1 (Solute carrier family 25 member 15) | SLC25A15 ORNT1 SP1855 | Q9Y619 | 4 |
| Mitochondrial Rho GTPase 1 (MIRO-1) (hMiro-1) (EC 3.6.5.-) (Rac-GTP-binding protein-like protein) (Ras homolog gene family member T1) | RHOT1 ARHT1 | Q8IXI2 | 4 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | MAPK1 | Q499G7 | 4 |
| Mitogen-activated protein kinase 7 (MAP kinase 7) (MAPK 7) (EC 2.7.11.24) (Big MAP kinase 1) (BMK-1) (Extracellular signal-regulated kinase 5) (ERK-5) | MAPK7 BMK1 ERK5 PRKM7 | Q13164 | 4 |
| Mitogen-activated protein kinase kinase kinase kinase 2 (EC 2.7.11.1) (B lymphocyte serine/threonine-protein kinase) (Germinal center kinase) (GC kinase) (MAPK/ERK kinase kinase kinase 2) (MEK kinase kinase 2) (MEKKK 2) (Rab8-interacting protein) | MAP4K2 GCK RAB8IP | Q12851 | 4 |
| Mitogen-activated protein kinase kinase kinase kinase 4 | MAP4K4 | E7EN19 | 4 |
| Mitogen-activated protein kinase-binding protein 1 (JNK-binding protein 1) (JNKBP-1) | MAPKBP1 JNKBP1 KIAA0596 | O60336 | 4 |
| Mitotic checkpoint serine/threonine-protein kinase BUB1 beta (EC 2.7.11.1) (MAD3/BUB1-related protein kinase) (hBUBR1) (Mitotic checkpoint kinase MAD3L) (Protein SSK1) | BUB1B BUBR1 MAD3L SSK1 | O60566 | 4 |
| Mitotic-spindle organizing protein 2A (Mitotic-spindle organizing protein associated with a ring of gamma-tubulin 2A) | MZT2A FAM128A MOZART2A | Q6P582 | 4 |
| MLN64 N-terminal domain homolog (Fragment) | STARD3NL | C9JPX5 | 4 |
| Molybdenum cofactor sulfurase (MCS) (MOS) (MoCo sulfurase) (hMCS) (EC 2.8.1.9) (Molybdenum cofactor sulfurtransferase) | MOCOS | Q96EN8 | 4 |
| MORC family CW-type zinc finger protein 3 (Nuclear matrix protein 2) (Zinc finger CW-type coiled-coil domain protein 3) | MORC3 KIAA0136 NXP2 ZCWCC3 | Q14149 | 4 |
| MORF4 family-associated protein 1 (Protein PGR1) (Protein associated with MRG of 14 kDa) | MRFAP1 PAM14 PGR1 | Q9Y605 | 4 |
| Motile sperm domain-containing protein 2 | MOSPD2 | Q8NHP6 | 4 |
| Mucin-1 (MUC-1) (Breast carcinoma-associated antigen DF3) (Cancer antigen 15-3) (CA 15-3) (Carcinoma-associated mucin) (Episialin) (H23AG) (Krebs von den Lungen-6) (KL-6) (PEMT) (Peanut-reactive urinary mucin) (PUM) (Polymorphic epithelial mucin) (PEM) (Tumor-associated epithelial membrane antigen) (EMA) (Tumor-associated mucin) (CD antigen CD227) [Cleaved into: Mucin-1 subunit alpha (MUC1-NT) (MUC1-alpha); Mucin-1 subunit beta (MUC1-beta) (MUC1-CT)] | MUC1 PUM | Q7Z550 | 4 |
| Mucin-15 (MUC-15) | MUC15 UNQ750/PRO1481 | Q8N387 | 4 |
| Mucin-19 (MUC-19) | MUC19 | Q7Z5P9 | 4 |
| Mucosal addressin cell adhesion molecule 1 (MAdCAM-1) (hMAdCAM-1) | MADCAM1 | Q13477 | 4 |
| Muscarinic acetylcholine receptor M2 | CHRM2 | P08172 | 4 |
| Muskelin | MKLN1 | Q9UL63 | 4 |
| Myb-related protein A (A-Myb) (Myb-like protein 1) | MYBL1 AMYB | P10243 | 4 |
| MYCBP-associated protein (AMAM-1) (AMY-1-binding protein 1) (AMAP-1) | MYCBPAP AMAP1 | Q8TBZ2 | 4 |
| Myelin protein P0 (Myelin peripheral protein) (MPP) (Myelin protein zero) | MPZ | P25189 | 4 |