| Kinesin-associated protein 3 (KAP-3) (KAP3) (Smg GDS-associated protein) | KIFAP3 KIF3AP SMAP | Q92845 | 4 |
| Kinesin-like protein KIF14 | KIF14 KIAA0042 | Q15058 | 4 |
| Kinesin-like protein KIF20B (Cancer/testis antigen 90) (CT90) (Kinesin-related motor interacting with PIN1) (M-phase phosphoprotein 1) (MPP1) | KIF20B KRMP1 MPHOSPH1 | Q96Q89 | 4 |
| Kinesin-like protein KIF23 (Kinesin-like protein 5) (Mitotic kinesin-like protein 1) | KIF23 KNSL5 MKLP1 | Q02241 | 4 |
| Kininogen-1 (Alpha-2-thiol proteinase inhibitor) (Fitzgerald factor) (High molecular weight kininogen) (HMWK) (Williams-Fitzgerald-Flaujeac factor) [Cleaved into: Kininogen-1 heavy chain; T-kinin (Ile-Ser-Bradykinin); Bradykinin (Kallidin I); Lysyl-bradykinin (Kallidin II); Kininogen-1 light chain; Low molecular weight growth-promoting factor] | KNG1 BDK KNG | P01042 | 4 |
| Krev interaction trapped protein 1 (Krev interaction trapped 1) (Cerebral cavernous malformations 1 protein) | KRIT1 CCM1 | O00522 | 4 |
| Krueppel-like factor 5 (Basic transcription element-binding protein 2) (BTE-binding protein 2) (Colon krueppel-like factor) (GC-box-binding protein 2) (Intestinal-enriched krueppel-like factor) (Transcription factor BTEB2) | KLF5 BTEB2 CKLF IKLF | Q13887 | 4 |
| Krueppel-like factor 8 (Basic krueppel-like factor 3) (Zinc finger protein 741) | KLF8 BKLF3 ZNF741 | O95600 | 4 |
| Krueppel-like factor 9 (Basic transcription element-binding protein 1) (BTE-binding protein 1) (GC-box-binding protein 1) (Transcription factor BTEB1) | KLF9 BTEB BTEB1 | Q13886 | 4 |
| Kynurenine/alpha-aminoadipate aminotransferase, mitochondrial (KAT/AadAT) (2-aminoadipate aminotransferase) (2-aminoadipate transaminase) (EC 2.6.1.39) (Alpha-aminoadipate aminotransferase) (AadAT) (Kynurenine aminotransferase II) (Kynurenine--oxoglutarate aminotransferase II) (Kynurenine--oxoglutarate transaminase 2) (EC 2.6.1.7) (Kynurenine--oxoglutarate transaminase II) | AADAT KAT2 | Q8N5Z0 | 4 |
| L-aminoadipate-semialdehyde dehydrogenase-phosphopantetheinyl transferase (EC 2.7.8.-) (4'-phosphopantetheinyl transferase) (Alpha-aminoadipic semialdehyde dehydrogenase-phosphopantetheinyl transferase) (AASD-PPT) (LYS5 ortholog) | AASDHPPT CGI-80 HAH-P HSPC223 x0005 | Q9NRN7 | 4 |
| L-dopachrome tautomerase (DCT) (DT) (EC 5.3.3.12) (L-dopachrome Delta-isomerase) (Tyrosinase-related protein 2) (TRP-2) (TRP2) | DCT TYRP2 | P40126 | 4 |
| L-lactate dehydrogenase (EC 1.1.1.27) | LDHB hCG_24788 | Q5U077 | 4 |
| Lamin-B2 | LMNB2 LMN2 | Q03252 | 4 |
| Large neutral amino acids transporter small subunit 2 (L-type amino acid transporter 2) (hLAT2) (Solute carrier family 7 member 8) | SLC7A8 LAT2 | Q9UHI5 | 4 |
| Large neutral amino acids transporter small subunit 3 (L-type amino acid transporter 3) (Prostate cancer overexpressed gene 1 protein) (Solute carrier family 43 member 1) | SLC43A1 LAT3 PB39 POV1 | O75387 | 4 |
| Late cornified envelope protein 2D (Late envelope protein 12) (Small proline-rich-like epidermal differentiation complex protein 1A) | LCE2D LEP12 SPRL1A | Q5TA82 | 4 |
| Late cornified envelope protein 3A (Late envelope protein 13) | LCE3A LEP13 | Q5TA76 | 4 |
| Latent-transforming growth factor beta-binding protein 3 (LTBP-3) | LTBP3 | Q9NS15 | 4 |
| Latent-transforming growth factor beta-binding protein 4 (LTBP-4) | LTBP4 | Q8N2S1 | 4 |
| Left-right determination factor 2 (Endometrial bleeding-associated factor) (Left-right determination factor A) (Protein lefty-2) (Protein lefty-A) (Transforming growth factor beta-4) (TGF-beta-4) | LEFTY2 EBAF LEFTA LEFTYA TGFB4 PSEC0024 | O00292 | 4 |
| Leptin (Obesity factor) | LEP hCG_33000 tcag7.84 | A4D0Y8 | 4 |
| Leptin receptor overlapping transcript-like 1 (Endospanin-2) | LEPROTL1 My047 UNQ577/PRO1139 | O95214 | 4 |
| Lethal(2) giant larvae protein homolog 2 (HGL) | LLGL2 | Q6P1M3 | 4 |
| Leucine carboxyl methyltransferase 2 (EC 2.1.1.-) (p21WAF1/CIP1 promoter-interacting protein) (tRNA wybutosine-synthesizing protein 4 homolog) (tRNA yW-synthesizing protein 4 homolog) | LCMT2 KIAA0547 TYW4 | O60294 | 4 |
| Leucine zipper transcription factor-like protein 1 | LZTFL1 | Q9NQ48 | 4 |
| Leucine-rich repeat and calponin homology domain-containing protein 3 | LRCH3 | Q96II8 | 4 |
| Leucine-rich repeat and calponin homology domain-containing protein 4 (Leucine-rich repeat neuronal protein 4) (Leucine-rich neuronal protein) | LRCH4 LRN LRRN1 LRRN4 | O75427 | 4 |
| Leucine-rich repeat-containing G-protein coupled receptor 4 (G-protein coupled receptor 48) | LGR4 GPR48 | Q9BXB1 | 4 |
| Leucine-rich repeat-containing protein 14 | LRRC14 KIAA0014 | Q15048 | 4 |
| Leucine-rich repeat-containing protein 28 | LRRC28 UNQ436/PRO867 | Q86X40 | 4 |
| Leucine-rich repeat-containing protein 37B (C66 SLIT-like testicular protein) | LRRC37B | Q96QE4 | 4 |
| Leucine-rich repeat-containing protein 48 | LRRC48 | Q9H069 | 4 |
| Leucyl-cystinyl aminopeptidase (Cystinyl aminopeptidase) (EC 3.4.11.3) (Insulin-regulated membrane aminopeptidase) (Insulin-responsive aminopeptidase) (IRAP) (Oxytocinase) (OTase) (Placental leucine aminopeptidase) (P-LAP) [Cleaved into: Leucyl-cystinyl aminopeptidase, pregnancy serum form] | LNPEP OTASE | Q9UIQ6 | 4 |
| Leukemia-associated protein 7 (Deleted in lymphocytic leukemia 7) | DLEU7 LEU7 | Q6UYE1 | 4 |
| Leukocyte immunoglobulin-like receptor subfamily A member 3 (CD85 antigen-like family member E) (Immunoglobulin-like transcript 6) (ILT-6) (Leukocyte immunoglobulin-like receptor 4) (LIR-4) (Monocyte inhibitory receptor HM43/HM31) (CD antigen CD85e) | LILRA3 ILT6 LIR4 | Q8N6C8 | 4 |
| Leukocyte immunoglobulin-like receptor subfamily A member 6 (Immunoglobulin-like transcript 8) (ILT-8) (Leukocyte Ig-like receptor) | LILRA6 ILT8 | Q6PI73 | 4 |
| Leukocyte-associated immunoglobulin-like receptor 2 (LAIR-2) (CD antigen CD306) | LAIR2 CD306 | Q6ISS4 | 4 |
| Leukotriene C4 synthase (LTC4 synthase) (EC 4.4.1.20) (Leukotriene-C(4) synthase) | LTC4S | Q16873 | 4 |
| Ligand-dependent corepressor (LCoR) (Mblk1-related protein 2) | LCOR KIAA1795 MLR2 | Q96JN0 | 4 |
| LIM/homeobox protein Lhx1 (LIM homeobox protein 1) (Homeobox protein Lim-1) (hLim-1) | LHX1 LIM-1 LIM1 | P48742 | 4 |
| LIM/homeobox protein Lhx9 (LIM homeobox protein 9) | LHX9 | Q9NQ69 | 4 |
| Lipid phosphate phosphohydrolase 2 (EC 3.1.3.4) (PAP2-gamma) (PAP2-G) (Phosphatidate phosphohydrolase type 2c) (Phosphatidic acid phosphatase 2c) (PAP-2c) (PAP2c) | PPAP2C LPP2 | O43688 | 4 |
| Lipoyl synthase, mitochondrial (EC 2.8.1.8) (Lipoate synthase) (LS) (Lip-syn) (Lipoic acid synthase) | LIAS LAS HUSSY-01 | O43766 | 4 |
| Liver carboxylesterase 1 (Acyl-coenzyme A:cholesterol acyltransferase) (ACAT) (Brain carboxylesterase hBr1) (Carboxylesterase 1) (CE-1) (hCE-1) (EC 3.1.1.1) (Cocaine carboxylesterase) (Egasyn) (HMSE) (Methylumbelliferyl-acetate deacetylase 1) (EC 3.1.1.56) (Monocyte/macrophage serine esterase) (Retinyl ester hydrolase) (REH) (Serine esterase 1) (Triacylglycerol hydrolase) (TGH) | CES1 CES2 SES1 | P23141 | 4 |
| LON peptidase N-terminal domain and RING finger protein 1 (RING finger protein 191) | LONRF1 RNF191 | Q17RB8 | 4 |
| Long-chain fatty acid transport protein 1 (FATP-1) (Fatty acid transport protein 1) (EC 6.2.1.-) (Solute carrier family 27 member 1) | SLC27A1 ACSVL5 FATP1 | Q6PCB7 | 4 |
| Loricrin | LOR LRN | P23490 | 4 |
| Low density lipoprotein-related protein 1 variant (Fragment) | 0 | Q59FG2 | 4 |
| Low-density lipoprotein receptor-related protein 3 (LRP-3) (105 kDa low-density lipoprotein receptor-related protein) (hLRp105) | LRP3 | O75074 | 4 |
| Low-density lipoprotein receptor-related protein 6 (LRP-6) | LRP6 | O75581 | 4 |
| Low-density lipoprotein receptor-related protein 8 (LRP-8) (Apolipoprotein E receptor 2) | LRP8 APOER2 | Q14114 | 4 |
| LUC7-like (S. cerevisiae) (LUC7-like (S. cerevisiae), isoform CRA_g) (Putative RNA-binding protein Luc7-like 1) | LUC7L hCG_22425 LA16c-OS12.1-001 | Q1W6G4 | 4 |
| Ly6/PLAUR domain-containing protein 6B | LYPD6B | Q8NI32 | 4 |
| Lymphocyte antigen 6 complex locus protein G5b | LY6G5B C6orf19 G5B | Q8NDX9 | 4 |
| Lymphoid enhancer-binding factor 1 (LEF-1) (T cell-specific transcription factor 1-alpha) (TCF1-alpha) | LEF1 | Q9UJU2 | 4 |
| LYN protein (Fragment) | LYN | Q6NUK7 | 4 |
| LYR motif-containing protein 4 | LYRM4 C6orf149 ISD11 CGI-203 | Q9HD34 | 4 |
| Lysine-specific demethylase 3A (EC 1.14.11.-) (JmjC domain-containing histone demethylation protein 2A) (Jumonji domain-containing protein 1A) | KDM3A JHDM2A JMJD1 JMJD1A KIAA0742 TSGA | Q9Y4C1 | 4 |
| Lysine-specific demethylase 3B (EC 1.14.11.-) (JmjC domain-containing histone demethylation protein 2B) (Jumonji domain-containing protein 1B) (Nuclear protein 5qNCA) | KDM3B C5orf7 JHDM2B JMJD1B KIAA1082 | Q7LBC6 | 4 |
| Lysine-specific demethylase 4B (EC 1.14.11.-) (JmjC domain-containing histone demethylation protein 3B) (Jumonji domain-containing protein 2B) | KDM4B JHDM3B JMJD2B KIAA0876 | O94953 | 4 |
| Lysine-specific demethylase 5A (EC 1.14.11.-) (Histone demethylase JARID1A) (Jumonji/ARID domain-containing protein 1A) (Retinoblastoma-binding protein 2) (RBBP-2) | KDM5A JARID1A RBBP2 RBP2 | P29375 | 4 |
| Lysophospholipid acyltransferase LPCAT4 (1-acylglycerol-3-phosphate O-acyltransferase 7) (1-AGP acyltransferase 7) (1-AGPAT 7) (1-acylglycerophosphocholine O-acyltransferase) (EC 2.3.1.23) (1-acylglycerophosphoserine O-acyltransferase) (EC 2.3.1.n6) (1-alkenylglycerophosphoethanolamine O-acyltransferase) (EC 2.3.1.121) (1-alkylglycerophosphocholine O-acetyltransferase) (EC 2.3.1.67) (Acyltransferase-like 3) (Lysophosphatidylcholine acyltransferase 4) (Lysophosphatidylethanolamine acyltransferase 2) (EC 2.3.1.n7) (Plasmalogen synthase) | LPCAT4 AGPAT7 AYTL3 LPEAT2 | Q643R3 | 4 |
| Lysosomal-associated transmembrane protein 4A (Golgi 4-transmembrane-spanning transporter MTP) | LAPTM4A KIAA0108 LAPTM4 MBNT MTRP UNQ1846/PRO3574 | Q15012 | 4 |
| Lysosomal-trafficking regulator (Beige homolog) | LYST CHS CHS1 | Q99698 | 4 |
| M-phase phosphoprotein 6 | MPHOSPH6 MPP6 | Q99547 | 4 |
| M-phase-specific PLK1-interacting protein (TTD non-photosensitive 1 protein) | MPLKIP C7orf11 TTDN1 | Q8TAP9 | 4 |
| Macrophage migration inhibitory factor (Fragment) | 0 | I4AY87 | 4 |
| Macrophage scavenger receptor types I and II (Macrophage acetylated LDL receptor I and II) (Scavenger receptor class A member 1) (CD antigen CD204) | MSR1 SCARA1 | P21757 | 4 |
| Magnesium transporter NIPA3 (NIPA-like protein 1) (Non-imprinted in Prader-Willi/Angelman syndrome region protein 3) | NIPAL1 NIPA3 NPAL1 | Q6NVV3 | 4 |
| Magnesium transporter protein 1 (MagT1) (Implantation-associated protein) (IAP) | MAGT1 IAG2 PSEC0084 UNQ628/PRO1244 | Q9H0U3 | 4 |
| MAGUK p55 subfamily member 4 (Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 5 protein) (Discs large homolog 6) | MPP4 ALS2CR5 DLG6 | Q96JB8 | 4 |
| Major facilitator superfamily domain-containing protein 12 | MFSD12 C19orf28 | Q6NUT3 | 4 |
| Mannosyl-oligosaccharide 1,2-alpha-mannosidase IB (EC 3.2.1.113) (Mannosidase alpha class 1A member 2) (Processing alpha-1,2-mannosidase IB) (Alpha-1,2-mannosidase IB) | MAN1A2 MAN1B | O60476 | 4 |
| Mannosyl-oligosaccharide glucosidase (EC 3.2.1.106) (Processing A-glucosidase I) | MOGS GCS1 | Q13724 | 4 |
| MAP kinase-activating death domain protein (Differentially expressed in normal and neoplastic cells) (Insulinoma glucagonoma clone 20) (Rab3 GDP/GTP exchange factor) | MADD DENN IG20 KIAA0358 | Q8WXG6 | 4 |
| MAP/microtubule affinity-regulating kinase 3 (EC 2.7.11.1) (C-TAK1) (cTAK1) (Cdc25C-associated protein kinase 1) (ELKL motif kinase 2) (EMK-2) (Protein kinase STK10) (Ser/Thr protein kinase PAR-1) (Par-1a) (Serine/threonine-protein kinase p78) | MARK3 CTAK1 EMK2 | P27448 | 4 |
| MAPK/MAK/MRK overlapping kinase (EC 2.7.11.22) (MOK protein kinase) (Renal tumor antigen 1) (RAGE-1) | MOK RAGE RAGE1 | Q9UQ07 | 4 |
| Max dimerization protein 1 (Max dimerizer 1) (Protein MAD) | MXD1 MAD | Q05195 | 4 |
| MBT domain-containing protein 1 | MBTD1 | Q05BQ5 | 4 |
| Mediator of RNA polymerase II transcription subunit 13 (Activator-recruited cofactor 250 kDa component) (ARC250) (Mediator complex subunit 13) (Thyroid hormone receptor-associated protein 1) (Thyroid hormone receptor-associated protein complex 240 kDa component) (Trap240) (Vitamin D3 receptor-interacting protein complex component DRIP250) (DRIP250) | MED13 ARC250 KIAA0593 THRAP1 TRAP240 | Q9UHV7 | 4 |
| Mediator of RNA polymerase II transcription subunit 14 (Activator-recruited cofactor 150 kDa component) (ARC150) (Cofactor required for Sp1 transcriptional activation subunit 2) (CRSP complex subunit 2) (Mediator complex subunit 14) (RGR1 homolog) (hRGR1) (Thyroid hormone receptor-associated protein complex 170 kDa component) (Trap170) (Transcriptional coactivator CRSP150) (Vitamin D3 receptor-interacting protein complex 150 kDa component) (DRIP150) | MED14 ARC150 CRSP2 CXorf4 DRIP150 EXLM1 RGR1 TRAP170 | O60244 | 4 |
| Mediator of RNA polymerase II transcription subunit 20 (Mediator complex subunit 20) (TRF-proximal protein homolog) (hTRFP) | MED20 TRFP | Q9H944 | 4 |
| Mediator of RNA polymerase II transcription subunit 21 (Mediator complex subunit 21) (RNA polymerase II holoenzyme component SRB7) (RNAPII complex component SRB7) (hSrb7) | MED21 SRB7 SURB7 | Q13503 | 4 |
| Mediator of RNA polymerase II transcription subunit 22 (Mediator complex subunit 22) (Surfeit locus protein 5) (Surf-5) | MED22 SURF5 | Q15528 | 4 |
| Mediator of RNA polymerase II transcription subunit 30 (Mediator complex subunit 30) (TRAP/Mediator complex component TRAP25) (Thyroid hormone receptor-associated protein 6) (Thyroid hormone receptor-associated protein complex 25 kDa component) (Trap25) | MED30 THRAP6 TRAP25 | Q96HR3 | 4 |
| Mediator of RNA polymerase II transcription subunit 4 (Activator-recruited cofactor 36 kDa component) (ARC36) (Mediator complex subunit 4) (TRAP/SMCC/PC2 subunit p36 subunit) (Vitamin D3 receptor-interacting protein complex 36 kDa component) (DRIP36) | MED4 ARC36 DRIP36 VDRIP HSPC126 | Q9NPJ6 | 4 |
| Meiotic recombination protein DMC1/LIM15 homolog | DMC1 DMC1H LIM15 | Q14565 | 4 |
| Melanoma-associated antigen 1 (Antigen MZ2-E) (Cancer/testis antigen 1.1) (CT1.1) (MAGE-1 antigen) | MAGEA1 MAGE1 MAGE1A | P43355 | 4 |
| Melanoma-derived growth regulatory protein (Melanoma inhibitory activity protein) | MIA | Q16674 | 4 |
| Membralin (Transmembrane protein 259) | TMEM259 C19orf6 | Q4ZIN3 | 4 |
| Membrane-associated guanylate kinase, WW and PDZ domain-containing protein 3 (Membrane-associated guanylate kinase inverted 3) (MAGI-3) | MAGI3 KIAA1634 | Q5TCQ9 | 4 |
| Membrane-associated phosphatidylinositol transfer protein 1 (Drosophila retinal degeneration B homolog) (Phosphatidylinositol transfer protein, membrane-associated 1) (PITPnm 1) (Pyk2 N-terminal domain-interacting receptor 2) (NIR-2) | PITPNM1 DRES9 NIR2 PITPNM | O00562 | 4 |
| Merlin (Moesin-ezrin-radixin-like protein) (Neurofibromin-2) (Schwannomerlin) (Schwannomin) | NF2 SCH | P35240 | 4 |
| Mesoderm development candidate 1 | MESDC1 | Q9H1K6 | 4 |
| Mesoderm induction early response protein 1 (Early response 1) (Er1) (Mi-er1) (hMi-er1) | MIER1 KIAA1610 | Q8N108 | 4 |
| Metabotropic glutamate receptor 4 (mGluR4) | GRM4 GPRC1D MGLUR4 | Q14833 | 4 |
| Metal transporter CNNM1 (Ancient conserved domain-containing protein 1) (Cyclin-M1) | CNNM1 ACDP1 | Q9NRU3 | 4 |
| Metallothionein-1M (MT-1M) (Metallothionein-IM) (MT-IM) | MT1M MT1K | Q8N339 | 4 |
| Meteorin | METRN C16orf23 RJD6 | Q9UJH8 | 4 |