| Latent-transforming growth factor beta-binding protein 2 (LTBP-2) | Ltbp2 | O08999 | 1 |
| Latrophilin-3 (Lectomedin-3) | Lphn3 Kiaa0768 Lec3 | Q80TS3 | 1 |
| Lectin-related NK cell receptor LY49L4 (Natural killer cell receptor Ly-49L4) | Klra12 | Q9JIP9 | 1 |
| Legumain (EC 3.4.22.34) (Asparaginyl endopeptidase) (Protease, cysteine 1) | Lgmn Prsc1 | O89017 | 1 |
| Leptin receptor (LEP-R) (B219) (OB receptor) (OB-R) (CD antigen CD295) | Lepr Db Obr | P48356 | 1 |
| Lethal(2) giant larvae protein homolog 1 (LLGL) (Mgl-1) (Mlgl) | Llgl1 Llglh | Q80Y17 | 1 |
| Lethal(2) giant larvae protein homolog 2 (Lethal giant larvae-like protein 2) | Llgl2 Llglh2 | Q3TJ91 | 1 |
| Leucine rich adaptor protein 1-like | Lurap1l D4Bwg0951e | Q8K2P1 | 1 |
| Leucine-rich PPR motif-containing protein, mitochondrial (130 kDa leucine-rich protein) (LRP 130) (mLRP130) | Lrpprc Lrp130 | Q6PB66 | 1 |
| Leucine-rich repeat and calponin homology domain-containing protein 4 | Lrch4 | Q921G6 | 1 |
| Leucine-rich repeat and coiled-coil domain-containing protein 1 | Lrrcc1 Kiaa1764 | Q69ZB0 | 1 |
| Leucine-rich repeat transmembrane neuronal protein 1 | Lrrtm1 | Q8K377 | 1 |
| Leucine-rich repeat-containing protein 16B | Lrrc16b | Q3UFQ8 | 1 |
| Leucine-rich repeat-containing protein 17 | Lrrc17 | Q9CXD9 | 1 |
| Leucine-rich repeat-containing protein 19 | Lrrc19 | Q8BZT5 | 1 |
| Leucine-rich repeat-containing protein 27 | Lrrc27 | Q80YS5 | 1 |
| Leucine-rich repeat-containing protein 34 | Lrrc34 | Q9DAM1 | 1 |
| Leucine-rich repeat-containing protein 40 | Lrrc40 | Q9CRC8 | 1 |
| Leucine-rich repeat-containing protein 45 | Lrrc45 | Q8CIM1 | 1 |
| Leucine-rich repeat-containing protein 48 | Lrrc48 | Q9D5E4 | 1 |
| Leucine-rich repeat-containing protein 4C (Netrin-G1 ligand) (NGL-1) | Lrrc4c Ngl1 | Q8C031 | 1 |
| Leucine-rich repeat-containing protein 8A | Lrrc8a Lrrc8 | Q80WG5 | 1 |
| Leucine-rich repeat-containing protein LOC400891 homolog | 0 | Q14BP6 | 1 |
| Leucine-rich repeats and immunoglobulin-like domains protein 2 (LIG-2) | Lrig2 Kiaa0806 | Q52KR2 | 1 |
| Leucine-rich repeats and immunoglobulin-like domains protein 3 (LIG-3) | Lrig3 Kiaa3016 | Q6P1C6 | 1 |
| Leukemia inhibitory factor receptor (LIF receptor) (LIF-R) (D-factor/LIF receptor) (CD antigen CD118) | Lifr | P42703 | 1 |
| Leukotriene A-4 hydrolase (LTA-4 hydrolase) (EC 3.3.2.6) (Leukotriene A(4) hydrolase) | Lta4h | P24527 | 1 |
| Leukotriene C4 synthase (LTC4 synthase) (EC 4.4.1.20) (Leukotriene-C(4) synthase) | Ltc4s | Q60860 | 1 |
| Ligand of Numb protein X 2 (Numb-binding protein 2) | Lnx2 | Q91XL2 | 1 |
| Ligand-dependent corepressor (LCoR) (Mblk1-related protein 2) | Lcor Kiaa1795 Mlr2 | Q6ZPI3 | 1 |
| Ligand-dependent nuclear receptor corepressor-like protein (LCoR-like protein) (Mblk1-related protein 1) (Transcription factor MLR1) | Lcorl Mlr1 | Q3U285 | 1 |
| LIM domain kinase 1 (LIMK-1) (EC 2.7.11.1) (KIZ-1) | Limk1 Limk | P53668 | 1 |
| LIM domain only 7 | Lmo7 | A0T1J8 | 1 |
| LIM domain-containing protein 1 | Limd1 | Q9QXD8 | 1 |
| LIM/homeobox protein Lhx1 (LIM homeobox protein 1) (Homeobox protein Lim-1) | Lhx1 Lim-1 Lim1 | P63006 | 1 |
| Limb region 1 protein | Lmbr1 | Q9JIT0 | 1 |
| Limbin | Evc2 Lbn | Q8K1G2 | 1 |
| Lipase | Lipo1 AI747699 | Q3UT41 | 1 |
| Lipase member H (EC 3.1.1.-) | Liph | Q8CIV3 | 1 |
| Lipase member K (EC 3.1.1.-) (Lipase-like abhydrolase domain-containing protein 2) | Lipk Lipl2 | Q8BM14 | 1 |
| LisH domain-containing protein ARMC9 | Armc9 | Q9D2I5 | 1 |
| LisH domain-containing protein FOPNL (FGFR1OP N-terminal-like protein) (FOP-related protein of 20 kDa) | Fopnl For20 | Q9CZS3 | 1 |
| LMBR1 domain-containing protein 2 | Lmbrd2 | Q8C561 | 1 |
| Lon protease homolog, mitochondrial (EC 3.4.21.-) (Lon protease-like protein) (LONP) (Mitochondrial ATP-dependent protease Lon) (Serine protease 15) | Lonp1 Prss15 | Q8CGK3 | 1 |
| Loss of heterozygosity 12 chromosomal region 1 protein homolog | Loh12cr1 | Q9D920 | 1 |
| Low density lipoprotein receptor adapter protein 1 (Autosomal recessive hypercholesterolemia protein homolog) | Ldlrap1 Arh | Q8C142 | 1 |
| Low-density lipoprotein receptor class A domain-containing protein 4 | Ldlrad4 D18Ertd653e | Q8BWJ4 | 1 |
| Low-density lipoprotein receptor-related protein 5 (LRP-5) (Low-density lipoprotein receptor-related protein 7) (LRP-7) (Lr3) | Lrp5 Lrp7 | Q91VN0 | 1 |
| LRRN4 C-terminal-like protein | Lrrn4cl | Q3TYX2 | 1 |
| Lumican (Keratan sulfate proteoglycan lumican) (KSPG lumican) | Lum Lcn Ldc | P51885 | 1 |
| Lymphocyte antigen 6 complex locus protein G5c | Ly6g5c | Q8K1T5 | 1 |
| Lymphocyte antigen 6A-2/6E-1 (Ly-6A.2/Ly-6E.1) (Stem cell antigen 1) (SCA-1) (T-cell-activating protein) (TAP) | Ly6a Ly6 | P05533 | 1 |
| Lymphocyte antigen 6C1 (Ly-6C1) | Ly6c1 | P0CW02 | 1 |
| Lymphocyte antigen 6D (Ly-6D) (Thymocyte B-cell antigen) (ThB) | Ly6d Ly61 Thb | P35459 | 1 |
| Lymphocyte antigen 6E (Ly-6E) (Stem cell antigen 2) (Thymic shared antigen 1) (TSA-1) | Ly6e Ly67 Sca-2 Tsa-1 | Q64253 | 1 |
| Lymphocyte antigen 6H (Ly-6H) | Ly6h | Q9WUC3 | 1 |
| Lymphocyte antigen 86 (Ly-86) (Protein MD-1) | Ly86 Md1 | O88188 | 1 |
| Lymphocyte antigen 96 (Ly-96) (ESOP-1) (Protein MD-2) | Ly96 Esop1 Md2 | Q9JHF9 | 1 |
| Lymphokine-activated killer T-cell-originated protein kinase (EC 2.7.12.2) (PDZ-binding kinase) (T-LAK cell-originated protein kinase) | Pbk Topk | Q9JJ78 | 1 |
| LYR motif-containing protein 4 | Lyrm4 Isd11 | Q8K215 | 1 |
| LYR motif-containing protein 9 | Lyrm9 | Q3UN90 | 1 |
| Lysine-specific demethylase 2A (EC 1.14.11.27) (F-box and leucine-rich repeat protein 11) (F-box/LRR-repeat protein 11) (JmjC domain-containing histone demethylation protein 1A) ([Histone-H3]-lysine-36 demethylase 1A) | Kdm2a Fbxl11 Jhdm1a Kiaa1004 | P59997 | 1 |
| Lysine-specific demethylase 3A (EC 1.14.11.-) (JmjC domain-containing histone demethylation protein 2A) (Jumonji domain-containing protein 1A) | Kdm3a Jhdm2a Jmjd1a Kiaa0742 | Q6PCM1 | 1 |
| Lysine-specific demethylase 5C (EC 1.14.11.-) (Histone demethylase JARID1C) (Jumonji/ARID domain-containing protein 1C) (Protein SmcX) (Protein Xe169) | Kdm5c Jarid1c Kiaa0234 Smcx Xe169 | P41230 | 1 |
| Lysine-specific demethylase 6B (EC 1.14.11.-) (JmjC domain-containing protein 3) (Jumonji domain-containing protein 3) | Kdm6b Jmjd3 Kiaa0346 | Q5NCY0 | 1 |
| Lysine-specific demethylase 7 (EC 1.14.11.-) (JmjC domain-containing histone demethylation protein 1D) | Jhdm1d Kdm7 Kiaa1718 | Q3UWM4 | 1 |
| Lysine-specific demethylase 8 (EC 1.14.11.27) (JmjC domain-containing protein 5) (Jumonji domain-containing protein 5) | Kdm8 Jmjd5 | Q9CXT6 | 1 |
| Lysine-specific demethylase PHF2 (EC 1.14.11.-) (GRC5) (PHD finger protein 2) | Phf2 Kiaa0662 | Q9WTU0 | 1 |
| Lysine-specific histone demethylase 1B (EC 1.-.-.-) (Flavin-containing amine oxidase domain-containing protein 1) (Lysine-specific histone demethylase 2) | Kdm1b Aof1 Lsd2 | Q8CIG3 | 1 |
| LysM and putative peptidoglycan-binding domain-containing protein 1 | Lysmd1 | Q9D0E3 | 1 |
| LysM and putative peptidoglycan-binding domain-containing protein 4 | Lysmd4 | Q8CC84 | 1 |
| Lysophosphatidic acid phosphatase type 6 (EC 3.1.3.2) (Acid phosphatase 6, lysophosphatidic) (Acid phosphatase-like protein 1) (PACPL1) | Acp6 Acpl1 Lpap | Q8BP40 | 1 |
| Lysosomal acid lipase/cholesteryl ester hydrolase (Acid cholesteryl ester hydrolase) (LAL) (EC 3.1.1.13) (Cholesteryl esterase) (Lipase A) (Sterol esterase) | Lipa Lip1 | Q9Z0M5 | 1 |
| Lysosomal amino acid transporter 1 homolog (PQ-loop repeat-containing protein 2) | Pqlc2 | Q8C4N4 | 1 |
| Lysosome-associated membrane glycoprotein 3 (LAMP-3) (Lysosomal-associated membrane protein 3) (DC-lysosome-associated membrane glycoprotein) (DC LAMP) (CD antigen CD208) | Lamp3 | Q7TST5 | 1 |
| Lysozyme-like protein 4 (Lysozyme-4) | Lyzl4 Lyc4 | Q9D925 | 1 |
| Lysozyme-like protein 6 (EC 3.2.1.17) | Lyzl6 Lyc1 | Q9DA11 | 1 |
| m7GpppN-mRNA hydrolase (EC 3.6.1.62) (mRNA-decapping enzyme 2) | Dcp2 | Q9CYC6 | 1 |
| Maestro heat-like repeat-containing protein family member 2A (HEAT repeat-containing protein 7B1) | Mroh2a Heatr7b1 | D3Z750 | 1 |
| Magnesium transporter NIPA1 (Non-imprinted in Prader-Willi/Angelman syndrome region protein 1 homolog) | Nipa1 Spg6 | Q8BHK1 | 1 |
| Magnesium transporter protein 1 (RIKEN cDNA 2610529C04, isoform CRA_b) | Magt1 2610529C04Rik mCG_13793 | A2ADH1 | 1 |
| MAGUK p55 subfamily member 6 (Dlgh4 protein) (P55T protein) (Protein associated with Lin-7 2) | Mpp6 Dlgh4 Pals2 | Q9JLB0 | 1 |
| Major facilitator superfamily domain-containing protein 2B | Mfsd2b | B8JK43 | 1 |
| Major facilitator superfamily domain-containing protein 3 | Mfsd3 | Q5U419 | 1 |
| Major urinary protein 3 (MUP 3) (Non-group 1/group 2 MUP15) | Mup3 | P04939 | 1 |
| Major urinary protein 8 (Protein Mup10) | Mup10 Mup8 | A2BIN1 | 1 |
| MAL-like protein (Protein BENE) | Mall Bene | Q91X49 | 1 |
| Malcavernin (Cerebral cavernous malformations protein 2 homolog) (Osmosensing scaffold for MEKK3) | Ccm2 Osm | Q8K2Y9 | 1 |
| Male-specific lethal 3 homolog (Male-specific lethal-3 homolog 1) (Male-specific lethal-3 protein-like 1) (MSL3-like 1) | Msl3 Msl31 Msl3l1 | Q9WVG9 | 1 |
| Maleylacetoacetate isomerase (MAAI) (EC 5.2.1.2) (GSTZ1-1) (Glutathione S-transferase zeta 1) (EC 2.5.1.18) | Gstz1 Maai | Q9WVL0 | 1 |
| Malignant fibrous histiocytoma-amplified sequence 1 homolog | Mfhas1 | Q3V1N1 | 1 |
| MAM domain-containing glycosylphosphatidylinositol anchor protein 2 (MAM domain-containing protein 1) | Mdga2 Mamdc1 | P60755 | 1 |
| Mannose-1-phosphate guanyltransferase alpha (EC 2.7.7.13) (GDP-mannose pyrophosphorylase A) (GTP-mannose-1-phosphate guanylyltransferase alpha) | Gmppa | Q922H4 | 1 |
| Mannose-P-dolichol utilization defect 1 (Mannose-P-dolichol utilization defect 1 protein) | Mpdu1 | Q8R0J2 | 1 |
| Mannosidase, alpha, class 1C, member 1 (Protein Man1c1) | Man1c1 mCG_12952 | Q6NXK9 | 1 |
| MAP kinase-activating death domain protein (Rab3 GDP/GTP exchange factor) | Madd Kiaa0358 | Q80U28 | 1 |
| MARCKS-related protein (Brain protein F52) (MARCKS-like protein 1) (Macrophage myristoylated alanine-rich C kinase substrate) (Mac-MARCKS) (MacMARCKS) | Marcksl1 Mlp Mrp | P28667 | 1 |
| Mas-related G-protein coupled receptor member A4 (RF-amide G-protein coupled receptor) | Mrgpra4 Mrga4 | Q91WW2 | 1 |
| Mas-related G-protein coupled receptor member B4 | Mrgprb4 Mrgb4 | Q91ZC0 | 1 |
| Mas-related G-protein coupled receptor member F (Mas-related gene F protein) | Mrgprf Mrgf | Q8VCJ6 | 1 |