| Melanoma inhibitory activity protein 2 | Mia2 | H3BJI6 | 1 |
| Melanoma inhibitory activity protein 2 | Mia2 | H3BJS0 | 1 |
| Melanoma inhibitory activity protein 2 | Mia2 | H3BK44 | 1 |
| Melanoma inhibitory activity protein 2 | Mia2 | H3BK48 | 1 |
| Melanoma inhibitory activity protein 2 | Mia2 | H3BKH2 | 1 |
| Melanoma inhibitory activity protein 2 | Mia2 | H3BL19 | 1 |
| Melanoma inhibitory activity protein 2 (Fragment) | Mia2 | H3BJ71 | 1 |
| Melanoma inhibitory activity protein 3 (Fragment) | Mia3 | J3KMG3 | 1 |
| Melanoma inhibitory activity protein 3 (Transport and Golgi organization protein 1) | Mia3 Kiaa0268 Tango1 | Q8BI84 | 1 |
| Melanophilin | Mlph | A0A0R4J075 | 1 |
| Melanotransferrin (Membrane-bound transferrin-like protein p97) (MTf) (CD antigen CD228) | Meltf Mfi2 Mtf | Q9R0R1 | 1 |
| Membrane-spanning 4-domains subfamily A member 6D (CD20 antigen-like 8) | Ms4a6d Cd20l8 Ms4a11 | Q99N07 | 1 |
| Merlin (Fragment) | Nf2 | F8WJ43 | 1 |
| Merlin (Fragment) | Nf2 | F7DBY2 | 1 |
| Mesenteric estrogen-dependent adipogenesis protein (Activated in W/Wv mouse stomach 3) (mAWMS3) (Mesenteric estrogen-dependent adipose 4) (MEDA-4) | Medag Awms3 Meda4 | Q14BA6 | 1 |
| Mesoderm development candidate 1 | Mesdc1 | Q9ERE8 | 1 |
| Metabotropic glutamate receptor 5 (mGluR5) | Grm5 Gprc1e Mglur5 | Q3UVX5 | 1 |
| Metalloendopeptidase (EC 3.4.24.-) | Tll1 mCG_22897 | G3X9F5 | 1 |
| Metalloreductase STEAP2 (Fragment) | Steap2 | D3Z1C4 | 1 |
| Metalloreductase STEAP4 (EC 1.16.1.-) (Dudulin-4) (Six-transmembrane epithelial antigen of prostate 4) (Tumor necrosis factor-alpha-induced adipose-related protein) | Steap4 Tiarp | Q923B6 | 1 |
| Metastasis-associated protein MTA1 (Metastasis-associated protein MTA1 isoform 4) | Mta1 | E9PX23 | 1 |
| Metastasis-associated protein MTA3 | Mta3 | E9Q794 | 1 |
| Metastasis-associated protein MTA3 (Putative uncharacterized protein) | Mta3 | Q3U3A7 | 1 |
| Metastasis-associated protein MTA3 (Putative uncharacterized protein) | Mta3 | Q3UII8 | 1 |
| Metaxin-1 | Mtx1 | F7C846 | 1 |
| Methionine aminopeptidase 2 (Fragment) | Metap2 | M0QW69 | 1 |
| Methionine aminopeptidase 2 (MAP 2) (MetAP 2) (EC 3.4.11.18) (Initiation factor 2-associated 67 kDa glycoprotein) (Peptidase M) (p67) (p67eIF2) | Metap2 METAP2 | Q3TMN1 | 1 |
| Methionine aminopeptidase 2 (MAP 2) (MetAP 2) (EC 3.4.11.18) (Initiation factor 2-associated 67 kDa glycoprotein) (Peptidase M) (p67) (p67eIF2) | Metap2 METAP2 | Q3UI33 | 1 |
| Methyl-CpG-binding domain protein 3 | Mbd3 | D3YTR4 | 1 |
| Methyl-CpG-binding domain protein 3 | Mbd3 | D3YTR5 | 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 TET1 (EC 1.14.11.n2) (CXXC-type zinc finger protein 6) (Ten-eleven translocation 1 gene protein homolog) | Tet1 Cxxc6 Kiaa1676 | Q3URK3 | 1 |
| Methylosome protein 50 (Fragment) | Wdr77 | F7D5L2 | 1 |
| Methylosome subunit pICln (Chloride channel, nucleotide sensitive 1A) (Chloride conductance regulatory protein ICln) (I(Cln)) (Chloride ion current inducer protein) (ClCI) | Clns1a Clci Clcni | Q61189 | 1 |
| Methylsterol monooxygenase 1 (Fragment) | Msmo1 | D3Z458 | 1 |
| Methyltransferase-like 26 | Mettl26 0610011F06Rik | E9Q7K5 | 1 |
| Methyltransferase-like 26 (RIKEN cDNA 0610011F06, isoform CRA_b) | Mettl26 0610011F06Rik mCG_17665 | G5E8X1 | 1 |
| Methyltransferase-like protein 7B (EC 2.1.1.-) | Mettl7b | Q9DD20 | 1 |
| Mevalonate kinase (Fragment) | Mvk | D3YV77 | 1 |
| Mevalonate kinase (MK) (EC 2.7.1.36) | Mvk | Q3UEB4 | 1 |
| MHC class III H2-Slp (haplotype a) sex-limited protein mRNA (Fragment) | 0 | V9GZG9 | 1 |
| MICOS complex subunit Mic25 (Coiled-coil-helix-coiled-coil-helix domain-containing protein 6) | Chchd6 Mic25 | Q91VN4 | 1 |
| MICOS complex subunit Mic26 (Apolipoprotein O) (MICOS complex subunit Mic23) (Protein FAM121B) | Apoo Fam121b Mic23 Mic26 | B1ASQ2 | 1 |
| MICOS complex subunit Mic26 (Apolipoprotein O) (MICOS complex subunit Mic23) (Protein FAM121B) | Apoo Fam121b Mic23 Mic26 | Q9D186 | 1 |
| MICOS complex subunit MIC60 (Mitofilin) (Fragment) | Immt | E9PVS5 | 1 |
| MICOS complex subunit MIC60 (Mitofilin) (Fragment) | Immt | F7BG64 | 1 |
| Microfibril-associated glycoprotein 3 | Mfap3 | Q922T2 | 1 |
| Microfibril-associated glycoprotein 3 | Mfap3 | A0A0R4J1C7 | 1 |
| Microfibrillar-associated protein 1A | Mfap1a | Q9CQU1 | 1 |
| Microfibrillar-associated protein 1A | Mfap1a | C0HKD8 | 1 |
| Microprocessor complex subunit DGCR8 (DiGeorge syndrome critical region 8 homolog) (Gy1) | Dgcr8 | Q9EQM6 | 1 |
| Microsomal glutathione S-transferase 1 | Mgst1 | D3YU60 | 1 |
| Microsomal glutathione S-transferase 1 | Mgst1 | E9QJW0 | 1 |
| Microsomal glutathione S-transferase 3 (Microsomal GST-3) (EC 2.5.1.18) (Microsomal GST-III) | Mgst3 | Q9CPU4 | 1 |
| Microsomal triglyceride transfer protein large subunit | Mttp Mtp | O08601 | 1 |
| Microtubule cross-linking factor 1 (Coiled-coil domain-containing protein 165) (PAR-1-interacting protein) (SOGA family member 2) | Mtcl1 Ccdc165 Kiaa0802 Soga2 | Q3UHU5 | 1 |
| Microtubule-associated protein | Map4 | A0A140T8T5 | 1 |
| Microtubule-associated protein | Mapt | B1AQW2 | 1 |
| Microtubule-associated protein 1A | Map1a Mtap1a | A2ARP8 | 1 |
| Microtubule-associated protein RP/EB family member 2 | Mapre2 | E9Q6X0 | 1 |
| Microtubule-associated protein RP/EB family member 3 | Mapre3 | D3Z6G3 | 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 protein tau (Neurofibrillary tangle protein) (Paired helical filament-tau) (PHF-tau) | Mapt Mtapt Tau | P10637 | 1 |
| Microtubule-associated serine/threonine-protein kinase 3 | Mast3 | E9Q8S5 | 1 |
| Microtubule-associated serine/threonine-protein kinase 4 (EC 2.7.11.1) | Mast4 | Q811L6 | 1 |
| Midasin AAA ATPase 1 | Mdn1 | A2ANY6 | 1 |
| Midkine (MK) (Retinoic acid-induced differentiation factor) | Mdk Mk | P12025 | 1 |
| Mini-agrin | Agrn Agrin | Q5EBX5 | 1 |
| Mini-chromosome maintenance complex-binding protein | Mcmbp | H9KV04 | 1 |
| MIP18 family protein FAM96A | Fam96a | Q9DCL2 | 1 |
| Mirror-image polydactyly gene 1 protein homolog | Mipol1 | Q9D9F8 | 1 |
| Misshapen-like kinase 1 | Mink1 | Q5SXG1 | 1 |
| Misshapen-like kinase 1 | Mink1 | Q5SXG3 | 1 |
| Misshapen-like kinase 1 (Fragment) | Mink1 | F7AMS7 | 1 |
| Mitochondrial 2-oxoglutarate/malate carrier protein (Fragment) | Slc25a11 | Q5SX46 | 1 |
| Mitochondrial amidoxime reducing component 2 (Fragment) | Marc2 Mosc2 | E0CZH6 | 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 brown fat uncoupling protein 1 (UCP 1) (Solute carrier family 25 member 7) (Thermogenin) | Ucp1 Slc25a7 Ucp | P12242 | 1 |
| Mitochondrial carnitine/acylcarnitine carrier protein (Carnitine/acylcarnitine translocase) (CAC) (mCAC) (Solute carrier family 25 member 20) | Slc25a20 Cac Cact | Q9Z2Z6 | 1 |
| Mitochondrial carrier homolog 1 (Mitochondrial carrier-like protein 1) | Mtch1 | Q791T5 | 1 |
| Mitochondrial carrier homolog 2 | Mtch2 | A2AFW6 | 1 |
| Mitochondrial carrier homolog 2 (Putative uncharacterized protein) | Mtch2 | Q9D050 | 1 |
| Mitochondrial chaperone BCS1 (BCS1-like protein) | Bcs1l | Q9CZP5 | 1 |
| Mitochondrial fission factor | Mff | E0CYB9 | 1 |
| Mitochondrial fission factor | Mff | E0CYI3 | 1 |
| Mitochondrial fission factor (Fragment) | Mff | F6VAL0 | 1 |
| Mitochondrial fission factor (Fragment) | Mff | F7B1A4 | 1 |
| Mitochondrial fission factor (Fragment) | Mff | F7CTF8 | 1 |
| Mitochondrial fission process protein 1 (Mitochondrial 18 kDa protein) (MTP18) | Mtfp1 Mtp18 | Q9CRB8 | 1 |
| Mitochondrial fission regulator 1-like | Mtfr1l Fam54b | D6RCX5 | 1 |
| Mitochondrial import inner membrane translocase subunit TIM14 | Dnajc19 | D3Z5K6 | 1 |
| Mitochondrial import inner membrane translocase subunit TIM14 (DnaJ homolog subfamily C member 19) | Dnajc19 Tim14 Timm14 | Q9CQV7 | 1 |
| Mitochondrial import inner membrane translocase subunit Tim17-B | Timm17b Tim17b | Q9Z0V7 | 1 |
| Mitochondrial import inner membrane translocase subunit TIM23 | Gm10273 Timm23 mCG_11298 mCG_123328 mCG_125709 | Q9CXU4 | 1 |
| Mitochondrial import inner membrane translocase subunit Tim29 (TIM29) | Timm29 | Q8BGX2 | 1 |
| Mitochondrial inner membrane protein OXA1L (Oxidase assembly 1-like protein) (OXA1-like protein) | Oxa1l | Q8BGA9 | 1 |
| Mitochondrial pyruvate carrier | Mpc1 Brp44l | Q9D6B6 | 1 |
| Mitochondrial Rho GTPase 1 (MIRO-1) (EC 3.6.5.-) (Ras homolog gene family member T1) | Rhot1 Arht1 | Q8BG51 | 1 |
| Mitochondrial ribonuclease P protein 1 (Mitochondrial RNase P protein 1) (EC 2.1.1.-) (RNA (guanine-9-)-methyltransferase domain-containing protein 1) (tRNA methyltransferase 10 homolog C) | Trmt10c Mrpp1 Rg9mtd1 | Q3UFY8 | 1 |
| Mitochondrial sodium/hydrogen exchanger 9B2 (Fragment) | Slc9b2 | A0A0G2JEX4 | 1 |