| Mitochondrial translation optimization 1 homolog (S. cerevisiae), isoform CRA_b (Protein MTO1 homolog, mitochondrial) | Mto1 mCG_15230 | G5E889 | 1 |
| Mitochondrial-processing peptidase subunit alpha (Peptidase (Mitochondrial processing) alpha, isoform CRA_a) | Pmpca mCG_18769 | A2AIW9 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | Mapk10 | E9QN59 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | Mapk10 | Q3TQZ7 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | Mapk10 | Q78GB8 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | Mapk10 JNK3B2 | Q80W80 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | Mapk10 JNK3A1 mCG_127089 | Q80W82 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) | Mapk10 JNK3A2 | Q8C9D4 | 1 |
| Mitogen-activated protein kinase (EC 2.7.11.24) (Fragment) | Mapk14 | B2KF34 | 1 |
| Mitogen-activated protein kinase kinase kinase 1 (EC 2.7.11.25) (MAPK/ERK kinase kinase 1) (MEK kinase 1) (MEKK 1) | Map3k1 Mekk Mekk1 | P53349 | 1 |
| Mitogen-activated protein kinase kinase kinase 21 (EC 2.7.11.25) (Mitogen-activated protein kinase kinase kinase MLK4) (Mixed lineage kinase 4) | Map3k21 Kiaa1804 Mlk4 | Q8VDG6 | 1 |
| Mitogen-activated protein kinase kinase kinase 3 (EC 2.7.11.25) (MAPK/ERK kinase kinase 3) (MEK kinase 3) (MEKK 3) | Map3k3 Mekk3 | Q61084 | 1 |
| Mitogen-activated protein kinase kinase kinase 6 (EC 2.7.11.25) (Apoptosis signal-regulating kinase 2) | Map3k6 Ask2 Mapkkk6 Mekk6 | Q9WTR2 | 1 |
| Mitogen-activated protein kinase kinase kinase kinase (EC 2.7.11.1) | Map4k5 | E9Q1T3 | 1 |
| Mitogen-activated protein kinase kinase kinase kinase (EC 2.7.11.1) | Map4k3 | E9QNE9 | 1 |
| Mitogen-activated protein kinase kinase kinase kinase 4 | Map4k4 | A0A0A6YWM8 | 1 |
| Mitoguardin 2 (Protein FAM73B) | Miga2 Fam73b | Q8BK03 | 1 |
| Mitotic checkpoint serine/threonine-protein kinase BUB1 (mBUB1) (EC 2.7.11.1) (BUB1A) | Bub1 | O08901 | 1 |
| Mitotic-spindle organizing protein 1 (Mitotic-spindle organizing protein associated with a ring of gamma-tubulin 1) | Mzt1 Mozart1 | Q8BUR9 | 1 |
| Mitotic-spindle organizing protein 2 (Mitotic-spindle organizing protein associated with a ring of gamma-tubulin 2B) | Mzt2 Fam128b Mozart2 | Q9CQ25 | 1 |
| MKIAA0051 protein (Fragment) | Iqgap1 mKIAA0051 | Q6ZQK2 | 1 |
| MKIAA0230 protein (Fragment) | Pxdn mKIAA0230 | Q80U60 | 1 |
| MKIAA0429 protein (Metastasis suppressor 1, isoform CRA_d) (Fragment) | Mtss1 mKIAA0429 mCG_116708 | Q6ZQB7 | 1 |
| MKIAA0687 protein (Fragment) | mKIAA0687 | Q6ZQ68 | 1 |
| MKIAA0705 protein (Fragment) | mKIAA0705 | Q80TU0 | 1 |
| MKIAA1740 protein (Fragment) | Cecr2 mKIAA1740 | Q6ZPI9 | 1 |
| MKIAA1897 protein (Fragment) | Pus7 mKIAA1897 | Q69Z76 | 1 |
| MKL/myocardin-like protein 2 (Myocardin-related transcription factor B) (MRTF-B) | Mkl2 Mrtfb | P59759 | 1 |
| MMS19 nucleotide excision repair protein homolog (Fragment) | Mms19 | F7C9N6 | 1 |
| MOB kinase activator 1B (Putative uncharacterized protein) | Mob1b Mobkl1a | Q3UDM0 | 1 |
| MOB kinase activator 3C (Mob1 homolog 2C) (Mps one binder kinase activator-like 2C) | Mob3c Mobkl2c | Q8BJG4 | 1 |
| MOB-like protein phocein | Mob4 | E0CXA9 | 1 |
| MOB-like protein phocein (Fragment) | Mob4 | G8JL35 | 1 |
| Molybdate-anion transporter (Major facilitator superfamily domain-containing protein 5) (Molybdate transporter 2 homolog) | Mfsd5 | Q921Y4 | 1 |
| Mon2 protein (Protein MON2 homolog) | Mon2 | B9EKJ3 | 1 |
| Monoacylglycerol lipase ABHD6 (EC 3.1.1.23) (2-arachidonoylglycerol hydrolase) (Abhydrolase domain-containing protein 6) | Abhd6 | Q8R2Y0 | 1 |
| Monocyte differentiation antigen CD14 (Myeloid cell-specific leucine-rich glycoprotein) | Cd14 mCG_124892 | Q4FJP7 | 1 |
| Monoglyceride lipase | Mgll | D3YYS6 | 1 |
| Monoglyceride lipase | Mgll | E9Q3B9 | 1 |
| Monoglyceride lipase (MGL) (EC 3.1.1.23) (Monoacylglycerol lipase) (MAGL) | Mgll | O35678 | 1 |
| Monoglyceride lipase (Putative uncharacterized protein) | Mgll | Q3UFN1 | 1 |
| MORF4 family-associated protein 1 (Protein associated with MRG of 14 kDa) | Mrfap1 Pam14 MNCb-1039 | Q9CQL7 | 1 |
| Mothers against decapentaplegic homolog (MAD homolog) (Mothers against DPP homolog) (SMAD family member) (Fragment) | Smad3 | A2CG44 | 1 |
| Mothers against decapentaplegic homolog 3 (Fragment) | Smad3 | F7BUP2 | 1 |
| Motile sperm domain-containing protein 1 | Mospd1 | Q8VEL0 | 1 |
| Motile sperm domain-containing protein 2 | Mospd2 | Q9CWP6 | 1 |
| Motile sperm domain-containing protein 2 | Mospd2 | B1AU74 | 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 |
| mRNA-capping enzyme [Includes: Polynucleotide 5'-triphosphatase (EC 3.1.3.33); mRNA guanylyltransferase (EC 2.7.7.50) (GTP--RNA guanylyltransferase) (GTase)] | Rngtt mCG_123462 | Q9DCC1 | 1 |
| Msx2-interacting protein | Spen | A2ADB0 | 1 |
| Msx2-interacting protein | Spen | A2ADB1 | 1 |
| Msx2-interacting protein (SMART/HDAC1-associated repressor protein) (SPEN homolog) | Spen Kiaa0929 Mint Sharp | Q62504 | 1 |
| Mth938 domain-containing protein (LI2) | Aamdc | Q8R0P4 | 1 |
| Mtmr2 protein (Myotubularin-related protein 2) | Mtmr2 | Q6P572 | 1 |
| Mtv-9 protein | 0 | Q61915 | 1 |
| Mtvr2 protein (Protein FAM89B) | Fam89b Mtvr2 | Q05DI7 | 1 |
| Mucin-like protein 2 (16.5 kDa submandibular gland glycoprotein) (Salivary protein 1) | Mucl2 Spt-1 Spt1 | P02815 | 1 |
| Mucin-like protein 2 (16.5 kDa submandibular gland glycoprotein) (Salivary protein 1) | Mucl2 Spt-1 Spt1 | Q9DA65 | 1 |
| Mucolipin-1 (Mucolipidin) | Mcoln1 | Q99J21 | 1 |
| Multidrug resistance-associated protein 6 (ATP-binding cassette sub-family C member 6) | Abcc6 Mrp6 | Q9R1S7 | 1 |
| Multiple myeloma tumor-associated protein 2 homolog | Mmtag2 | Q99LX5 | 1 |
| Multiple PDZ domain protein | Mpdz | D3YUX2 | 1 |
| Mutated in colorectal cancers | Mcc | E9PWI3 | 1 |
| MutS protein homolog 5 | Msh5 | Q9QUM7 | 1 |
| Myb/SANT-like DNA-binding domain-containing protein 3 | Msantd3 | Q9CR78 | 1 |
| Myelin basic protein (Fragment) | Mbp | F6VME3 | 1 |
| Myelin expression factor 2 | Myef2 | A2ATP5 | 1 |
| Myelin expression factor 2 | Myef2 | A2ATP6 | 1 |
| Myelin expression factor 2 (Fragment) | Myef2 | F6XJA1 | 1 |
| Myelin expression factor 2 (Fragment) | Myef2 | G8JL68 | 1 |
| Myelin-associated glycoprotein (Siglec-4a) | Mag | P20917 | 1 |
| Myelin-oligodendrocyte glycoprotein | Mog | Q61885 | 1 |
| Myelin-oligodendrocyte glycoprotein | Mog mCG_22615 | Q3UY21 | 1 |
| Myeloid/lymphoid or mixed-lineage leukemia (Trithorax homolog, Drosophila); translocated to, 11, isoform CRA_a (Putative uncharacterized protein) | Mllt11 mCG_13708 | Q543U0 | 1 |
| Myh9 protein (Fragment) | Myh9 | Q99JJ3 | 1 |
| Myo18a protein (Unconventional myosin-XVIIIa) | Myo18a | B2RRE2 | 1 |
| Myoglobin | Mb | P04247 | 1 |
| Myosin light chain 1/3, skeletal muscle isoform | Myl1 | A0A087WRZ7 | 1 |
| Myosin light chain 1/3, skeletal muscle isoform | Myl1 | E9PWG4 | 1 |
| Myosin light chain 1/3, skeletal muscle isoform (MLC1/MLC3) (MLC1F/MLC3F) (Myosin light chain alkali 1/2) (Myosin light chain A1/A2) | Myl1 Mylf | P05977 | 1 |
| Myosin light chain 4 (MLC1EMB) (Myosin light chain 1, atrial/fetal isoform) (MLC1A) | Myl4 Mlc1a Myla | P09541 | 1 |
| Myosin light chain kinase 2, skeletal/cardiac muscle (MLCK2) (EC 2.7.11.18) | Mylk2 | Q8VCR8 | 1 |
| Myosin phosphatase Rho-interacting protein (Fragment) | Mprip | F6RND9 | 1 |
| Myosin phosphatase Rho-interacting protein (Rho-interacting protein 3) (RIP3) (p116Rip) | Mprip Kiaa0864 Mrip Rhoip3 | P97434 | 1 |
| Myosin regulatory light chain 2, skeletal muscle isoform (Fast skeletal myosin light chain 2) (MLC2F) | Mylpf | P97457 | 1 |
| Myosin regulatory light chain 2, ventricular/cardiac muscle isoform (MLC-2) (MLC-2v) (Myosin light chain 2, slow skeletal/ventricular muscle isoform) (MLC-2s/v) | Myl2 Mylpc | P51667 | 1 |
| Myosin VIIa isoform 2 (Unconventional myosin-VIIa) | Myo7a | Q5MJ56 | 1 |
| Myosin-10 | Myh10 | Q5SV64 | 1 |
| Myosin-14 | Myh14 | K3W4R2 | 1 |
| Myotubularin-related protein 14 | Mtmr14 | D6RDS6 | 1 |
| Myotubularin-related protein 14 (EC 3.1.3.-) (mJumpy) | Mtmr14 | Q8VEL2 | 1 |
| Myotubularin-related protein 14 (Fragment) | Mtmr14 | D3Z1C1 | 1 |
| Myotubularin-related protein 3 (Fragment) | Mtmr3 | B1ATD4 | 1 |
| Myotubularin-related protein 3 (Fragment) | Mtmr3 | R4GML8 | 1 |
| Myotubularin-related protein 4 (EC 3.1.3.48) | Mtmr4 | Q91XS1 | 1 |
| N-acetyl-D-glucosamine kinase | Nagk | D3YXG2 | 1 |
| N-acetyl-D-glucosamine kinase (N-acetylglucosamine kinase) (EC 2.7.1.59) (GlcNAc kinase) | Nagk Gnk | Q9QZ08 | 1 |
| N-acetylated alpha-linked acidic dipeptidase 2, isoform CRA_a (N-acetylated-alpha-linked acidic dipeptidase 2) | Naalad2 mCG_4774 | G3UWC2 | 1 |
| N-acetyllactosaminide beta-1,3-N-acetylglucosaminyltransferase 2 (EC 2.4.1.149) (Beta-1,3-N-acetylglucosaminyltransferase 1) (BGnT-1) (Beta-1,3-Gn-T1) (Beta3Gn-T1) (Beta-1,3-galactosyltransferase 7) (Beta-1,3-GalTase 7) (Beta3Gal-T7) (Beta3GalT7) (b3Gal-T7) (Beta-3-Gx-T7) (UDP-Gal:beta-GlcNAc beta-1,3-galactosyltransferase 7) (UDP-GlcNAc:betaGal beta-1,3-N-acetylglucosaminyltransferase 2) (BGnT-2) (Beta-1,3-Gn-T2) (Beta-1,3-N-acetylglucosaminyltransferase 2) (Beta3Gn-T2) (UDP-galactose:beta-N-acetylglucosamine beta-1,3-galactosyltransferase 7) | B3GNT2 B3gnt1 Beta3gnt | Q9Z222 | 1 |
| N-acetyltransferase ESCO2 (EC 2.3.1.-) (Establishment of cohesion 1 homolog 2) (ECO1 homolog 2) | Esco2 | Q8CIB9 | 1 |