| Merlin (Moesin-ezrin-radixin-like protein) (Neurofibromin-2) (Schwannomin) | Nf2 Nf-2 | P46662 | 1 |
| Mesoderm development candidate 1 | Mesdc1 | Q9ERE8 | 1 |
| Mesothelin (Pre-pro-megakaryocyte-potentiating factor) [Cleaved into: Megakaryocyte-potentiating factor (MPF); Mesothelin, cleaved form] | Msln Mes Mpf | Q61468 | 1 |
| Metal transporter CNNM2 (Ancient conserved domain-containing protein 2) (mACDP2) (Cyclin-M2) | Cnnm2 Acdp2 | Q3TWN3 | 1 |
| Metal transporter CNNM3 (Ancient conserved domain-containing protein 3) (mACDP3) (Cyclin-M3) | Cnnm3 Acdp3 | Q32NY4 | 1 |
| Metal transporter CNNM4 (Ancient conserved domain-containing protein 4) (mACDP4) (Cyclin-M4) | Cnnm4 Acdp4 Kiaa1592 | Q69ZF7 | 1 |
| Metalloendopeptidase OMA1, mitochondrial (EC 3.4.24.-) (Overlapping with the m-AAA protease 1 homolog) | Oma1 | Q9D8H7 | 1 |
| Metalloprotease TIKI2 (EC 3.4.-.-) (Heart, kidney and adipose-enriched transmembrane protein) (TRAB domain-containing protein 2B) | Trabd2b Gm12824 Hkat Tiki2 | B1ATG9 | 1 |
| Metalloproteinase inhibitor 3 (Tissue inhibitor of metalloproteinases 3) (TIMP-3) | Timp3 Sun Timp-3 | P39876 | 1 |
| Metalloreductase STEAP2 (EC 1.16.1.-) (Six-transmembrane epithelial antigen of prostate 2) | Steap2 | Q8BWB6 | 1 |
| Metastasis-associated protein MTA2 (Metastasis-associated 1-like 1) | Mta2 Mta1l1 | Q9R190 | 1 |
| Methenyltetrahydrofolate synthase domain-containing protein | Mthfsd | Q3URQ7 | 1 |
| Methionyl-tRNA formyltransferase, mitochondrial (MtFMT) (EC 2.1.2.9) | Mtfmt Fmt | Q9D799 | 1 |
| Methyl-CpG-binding domain protein 3 (Methyl-CpG-binding protein MBD3) | Mbd3 | Q9Z2D8 | 1 |
| Methyl-CpG-binding domain protein 4 (EC 3.2.2.-) (Methyl-CpG-binding protein MBD4) (Mismatch-specific DNA N-glycosylase) | Mbd4 | Q9Z2D7 | 1 |
| Methyl-CpG-binding domain protein 5 | Mbd5 | B1AYB5 | 1 |
| Methylcrotonoyl-CoA carboxylase subunit alpha, mitochondrial (MCCase subunit alpha) (EC 6.4.1.4) (3-methylcrotonyl-CoA carboxylase 1) (3-methylcrotonyl-CoA carboxylase biotin-containing subunit) (3-methylcrotonyl-CoA:carbon dioxide ligase subunit alpha) | Mccc1 Mcca | Q99MR8 | 1 |
| Methylcytosine dioxygenase TET3 (EC 1.14.11.n2) | Tet3 | Q8BG87 | 1 |
| Methylmalonic aciduria and homocystinuria type C protein homolog | Mmachc | Q9CZD0 | 1 |
| Methylmalonic aciduria type A homolog, mitochondrial (EC 3.6.-.-) | Mmaa | Q8C7H1 | 1 |
| Methyltransferase-like protein 10 (EC 2.1.1.-) | Mettl10 | Q9D853 | 1 |
| Methyltransferase-like protein 23 (EC 2.1.1.-) | Mettl23 | A2AA28 | 1 |
| MHC class I antigen (MHC class I antigen splice variant Bl.1) (Major histocompatibility complex class I b) | H2-Bl | O19440 | 1 |
| Microfibril-associated glycoprotein 4 | Mfap4 | Q9D1H9 | 1 |
| Microtubule-associated protein 1A (MAP-1A) [Cleaved into: MAP1A heavy chain; MAP1 light chain LC2] | Map1a Mtap1 Mtap1a | Q9QYR6 | 1 |
| Microtubule-associated protein 1S (MAP-1S) (BPY2-interacting protein 1) (Microtubule-associated protein 8) [Cleaved into: MAP1S heavy chain; MAP1S light chain] | Map1s Bpy2ip1 Map8 Mtap1s | Q8C052 | 1 |
| Microtubule-associated protein RP/EB family member 3 (EB1 protein family member 3) (EBF3) (End-binding protein 3) (EB3) (RP3) | Mapre3 | Q6PER3 | 1 |
| Microtubule-associated serine/threonine-protein kinase 2 (EC 2.7.11.1) | Mast2 Mast205 | Q60592 | 1 |
| Microtubule-associated serine/threonine-protein kinase 3 (EC 2.7.11.1) | Mast3 Kiaa0561 | Q3U214 | 1 |
| Mid1-interacting protein 1 (Gastrulation-specific G12-like protein) (Mid1-interacting G12-like protein) (Protein STRAIT11499 homolog) (Spot 14-related protein) (S14R) (Spot 14-R) | Mid1ip1 Mig12 | Q9CQ20 | 1 |
| MIF4G domain-containing protein | Mif4gd | Q3UBZ5 | 1 |
| Migration and invasion enhancer 1 | Mien1 Rdx12 | Q9CQ86 | 1 |
| Mimitin, mitochondrial (Myc-induced mitochondrial protein) (MMTN) (NADH dehydrogenase [ubiquinone] 1 alpha subcomplex assembly factor 2) (NDUFA12-like protein) | Ndufaf2 Ndufa12l | Q59J78 | 1 |
| Mismatch repair endonuclease PMS2 (Postmeiotic segregation increased 2 (S. cerevisiae)) (Postmeiotic segregation increased 2 (S. cerevisiae), isoform CRA_d) | Pms2 mCG_17957 | B9EJ22 | 1 |
| Misshapen-like kinase 1 (EC 2.7.11.1) (GCK family kinase MiNK) (MAPK/ERK kinase kinase kinase 6) (MEK kinase kinase 6) (MEKKK 6) (Misshapen/NIK-related kinase) (Mitogen-activated protein kinase kinase kinase kinase 6) | Mink1 Map4k6 Mink | Q9JM52 | 1 |
| Mitochondrial 2-oxoglutarate/malate carrier protein (OGCP) (Solute carrier family 25 member 11) | Slc25a11 | Q9CR62 | 1 |
| Mitochondrial antiviral-signaling protein (MAVS) (CARD adapter inducing interferon beta) (Cardif) (Interferon beta promoter stimulator protein 1) (IPS-1) (Virus-induced-signaling adapter) (VISA) | Mavs Ips1 Visa | Q8VCF0 | 1 |
| Mitochondrial calcium uniporter regulator 1 (Coiled-coil domain-containing protein 90A, mitochondrial) | Mcur1 Ccdc90a | Q9CXD6 | 1 |
| Mitochondrial chaperone BCS1 (BCS1-like protein) | Bcs1l | Q9CZP5 | 1 |
| Mitochondrial dicarboxylate carrier (Solute carrier family 25 member 10) | Slc25a10 Dic | Q9QZD8 | 1 |
| Mitochondrial fission 1 protein (FIS1 homolog) (Tetratricopeptide repeat protein 11) (TPR repeat protein 11) | Fis1 Ttc11 | Q9CQ92 | 1 |
| Mitochondrial fission process protein 1 (Mitochondrial 18 kDa protein) (MTP18) | Mtfp1 Mtp18 | Q9CRB8 | 1 |
| Mitochondrial folate transporter/carrier (Solute carrier family 25 member 32) | Slc25a32 Mftc | Q8BMG8 | 1 |
| Mitochondrial import inner membrane translocase subunit TIM50 | Timm50 Tim50 | Q9D880 | 1 |
| Mitochondrial import inner membrane translocase subunit Tim9 | Timm9 Tim9 Tim9a Timm9a | Q9WV98 | 1 |
| Mitochondrial import receptor subunit TOM34 (Translocase of outer membrane 34 kDa subunit) | Tomm34 | Q9CYG7 | 1 |
| Mitochondrial import receptor subunit TOM40 homolog (Mitochondrial outer membrane protein of 35 kDa) (MOM35) (Protein Haymaker) (Translocase of outer membrane 40 kDa subunit homolog) | Tomm40 Mom35 Tom40 | Q9QYA2 | 1 |
| Mitochondrial inner membrane protease ATP23 homolog (EC 3.4.24.-) (XRCC6-binding protein 1) | Xrcc6bp1 | Q9CWQ3 | 1 |
| Mitochondrial inner membrane protein OXA1L (Oxidase assembly 1-like protein) (OXA1-like protein) | Oxa1l | Q8BGA9 | 1 |
| Mitochondrial intermediate peptidase (MIP) (EC 3.4.24.59) | Mipep | A6H611 | 1 |
| Mitochondrial intermembrane space import and assembly protein 40 (Coiled-coil-helix-coiled-coil-helix domain-containing protein 4) | Chchd4 Mia40 | Q8VEA4 | 1 |
| Mitochondrial ribosome-associated GTPase 1 (GTP-binding protein 7) (Mitochondrial GTPase 1) | Mtg1 Gm169 Gtpbp7 | Q8R2R6 | 1 |
| Mitochondrial tRNA-specific 2-thiouridylase 1 (EC 2.8.1.-) | Trmu Mtu1 Trmt1 | Q9DAT5 | 1 |
| Mitochondrial uncoupling protein 2 (UCP 2) (Solute carrier family 25 member 8) (UCPH) | Ucp2 Slc25a8 | P70406 | 1 |
| Mitofusin-2 (EC 3.6.5.-) (Hypertension-related protein 1) (Mitochondrial assembly regulatory factor) (HSG protein) (Transmembrane GTPase MFN2) | Mfn2 Kiaa0214 Marf | Q80U63 | 1 |
| Mitogen activated protein kinase kinase kinase 2 (Mitogen-activated protein kinase kinase kinase 2) | Map3k2 mCG_127139 | G5E8L8 | 1 |
| Mitogen-activated protein kinase 6 (MAP kinase 6) (MAPK 6) (EC 2.7.11.24) (Extracellular signal-regulated kinase 3) (ERK-3) | Mapk6 Erk3 Prkm4 Prkm6 | Q61532 | 1 |
| Mitogen-activated protein kinase kinase kinase 4 (EC 2.7.11.25) (MAPK/ERK kinase kinase 4) (MEK kinase 4) (MEKK 4) | Map3k4 Mekk4 | O08648 | 1 |
| Mitogen-activated protein kinase kinase kinase 7 (EC 2.7.11.25) (Transforming growth factor-beta-activated kinase 1) (TGF-beta-activated kinase 1) | Map3k7 Tak1 | Q62073 | 1 |
| Mitogen-activated protein kinase kinase kinase kinase 4 (EC 2.7.11.1) (HPK/GCK-like kinase HGK) (MAPK/ERK kinase kinase kinase 4) (MEK kinase kinase 4) (MEKKK 4) (Nck-interacting kinase) | Map4k4 Nik | P97820 | 1 |
| Mitogen-activated protein kinase kinase kinase kinase 5 (EC 2.7.11.1) (MAPK/ERK kinase kinase kinase 5) (MEK kinase kinase 5) (MEKKK 5) | Map4k5 | Q8BPM2 | 1 |
| Mitogen-activated protein kinase-binding protein 1 (JNK-binding protein 1) (JNKBP-1) | Mapkbp1 Jnkbp1 Kiaa0596 | Q6NS57 | 1 |
| Mitotic spindle assembly checkpoint protein MAD2B (Mitotic arrest deficient 2-like protein 2) (MAD2-like protein 2) | Mad2l2 Mad2b Rev7 | Q9D752 | 1 |
| MKIAA0453 protein (Fragment) | Vps13d mKIAA0453 | Q6A066 | 1 |
| MKL/myocardin-like protein 1 (Basic SAP coiled-coil transcription activator) (Megakaryoblastic leukemia 1 protein homolog) (Myocardin-related transcription factor A) (MRTF-A) | Mkl1 Bsac | Q8K4J6 | 1 |
| MLN64 N-terminal domain homolog (STARD3 N-terminal-like protein) | Stard3nl Mentho | Q9DCI3 | 1 |
| MLX-interacting protein (Transcriptional activator MondoA) | Mlxip Mir | Q2VPU4 | 1 |
| MOB kinase activator 1B (Mob1 homolog 1A) (Mps one binder kinase activator-like 1A) | Mob1b Mobkl1a | Q8BPB0 | 1 |
| MOB kinase activator 3A (Mob1 homolog 2A) (Mps one binder kinase activator-like 2A) | Mob3a Mobkl2a | Q8BSU7 | 1 |
| MOB-like protein phocein (Class II mMOB1) (Mob1 homolog 3) (Mob3) (Mps one binder kinase activator-like 3) (Preimplantation protein 3) | Mob4 Mob3 Mobkl3 Phocn Prei3 | Q6PEB6 | 1 |
| Mono [ADP-ribose] polymerase PARP16 (EC 2.4.2.31) (ADP-ribosyltransferase diphtheria toxin-like 15) (ARTD15) (Poly [ADP-ribose] polymerase 16) (PARP-16) | Parp16 | Q7TMM8 | 1 |
| Monocarboxylate transporter 7 (MCT 7) (Monocarboxylate transporter 6) (MCT 6) (Solute carrier family 16 member 6) | Slc16a6 Mct7 | B1AT66 | 1 |
| Monofunctional C1-tetrahydrofolate synthase, mitochondrial (EC 6.3.4.3) (Formyltetrahydrofolate synthetase) | Mthfd1l Fthfsdc1 | Q3V3R1 | 1 |
| MOR 3'Beta4 (Olfactory receptor 630) (Olfactory receptor MOR17-1) (Olfactory receptor Olfr630) (Protein Olfr630) | Olfr630 mCG_64532 | Q9EQQ7 | 1 |
| MORC family CW-type zinc finger protein 2A (Zinc finger CW-type coiled-coil domain protein 1) | Morc2a Kiaa0852 Zcwcc1 | Q69ZX6 | 1 |
| MORC family CW-type zinc finger protein 4 (Zinc finger CW-type coiled-coil domain protein 2) | Morc4 Zcwcc2 | Q8BMD7 | 1 |
| MORN repeat-containing protein 3 | Morn3 | Q8C5T4 | 1 |
| MORN repeat-containing protein 4 | Morn4 | Q6PGF2 | 1 |
| Mothers against decapentaplegic homolog 3 (MAD homolog 3) (Mad3) (Mothers against DPP homolog 3) (mMad3) (SMAD family member 3) (SMAD 3) (Smad3) | Smad3 Madh3 | Q8BUN5 | 1 |
| Mothers against decapentaplegic homolog 6 (MAD homolog 6) (Mothers against DPP homolog 6) (Mad homolog 7) (SMAD family member 6) (SMAD 6) (Smad6) | Smad6 Madh6 Madh7 Msmad6 | O35182 | 1 |
| Motile sperm domain-containing protein 1 | Mospd1 | Q8VEL0 | 1 |
| mRNA cap guanine-N7 methyltransferase (EC 2.1.1.56) (RG7MT1) (mRNA (guanine-N(7)-)-methyltransferase) (mRNA cap methyltransferase) | Rnmt Kiaa0398 | Q9D0L8 | 1 |
| mRNA-capping enzyme (HCE) (MCE1) [Includes: Polynucleotide 5'-triphosphatase (TPase) (mRNA 5'-triphosphatase) (EC 3.1.3.33); mRNA guanylyltransferase (EC 2.7.7.50) (GTP--RNA guanylyltransferase) (GTase)] | Rngtt Cap1a | O55236 | 1 |
| Multicilin (Multiciliate differentiation and DNA synthesis-associated cell cycle protein) (Protein Idas) | Mcidas Gm6320 Idas Mci Mcin | Q3UZ45 | 1 |
| Multidrug resistance-associated protein 6 (ATP-binding cassette sub-family C member 6) | Abcc6 Mrp6 | Q9R1S7 | 1 |
| Multiple epidermal growth factor-like domains protein 9 (Multiple EGF-like domains protein 9) (Epidermal growth factor-like protein 5) (EGF-like protein 5) | Megf9 Egfl5 Kiaa0818 | Q8BH27 | 1 |
| Multiple myeloma tumor-associated protein 2 homolog | Mmtag2 | Q99LX5 | 1 |
| Multivesicular body subunit 12A (ESCRT-I complex subunit MVB12A) (Protein FAM125A) | Mvb12a Fam125a | Q78HU3 | 1 |
| Muscarinic acetylcholine receptor M5 | Chrm5 | Q920H4 | 1 |
| Myb-related transcription factor, partner of profilin (Myb-related protein p42POP) (Partner of profilin) | Mypop P42pop | Q8R4U1 | 1 |
| Myb/SANT-like DNA-binding domain-containing protein 1 | Msantd1 | Q8BIL2 | 1 |
| Myb/SANT-like DNA-binding domain-containing protein 2 | Msantd2 | Q6NZR2 | 1 |
| Mycophenolic acid acyl-glucuronide esterase, mitochondrial (EC 3.1.1.93) (Alpha/beta hydrolase domain-containing protein 10) (Abhydrolase domain-containing protein 10) | Abhd10 | Q6PE15 | 1 |
| Myelin expression factor 2 (MEF-2) (MyEF-2) | Myef2 Kiaa1341 Mef2 | Q8C854 | 1 |
| Myelin regulatory factor-like protein | Myrfl Gm239 | Q3UN70 | 1 |
| Myelin transcription factor 1 (MyT1) (Neural zinc finger factor 2) (NZF-2) | Myt1 Kiaa0835 Nzf2 | Q8CFC2 | 1 |
| Myelin transcription factor 1-like protein | Myt1l | D3Z1P7 | 1 |
| Myeloid cell surface antigen CD33 (Sialic acid-binding Ig-like lectin 3) (Siglec-3) (CD antigen CD33) | Cd33 Siglec3 | Q63994 | 1 |
| Myeloma-overexpressed gene 2 protein homolog | Myeov2 | Q3U898 | 1 |
| Myocyte enhancer factor 2B, isoform CRA_a (Myocyte-specific enhancer factor 2B) (Protein 2310045N01Rik) | 2310045N01Rik Mef2b mCG_23096 | K7N7F1 | 1 |