| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| O02769 | Melatonin receptor type 1A; Mel-1A-R; Mel1a receptor; Fragment; | MTNR1A; | NULL | 257 | cow |
| Q4JIJ2 | Methionine synthase reductase; MSR; EC 1.16.1.8; | MTRR; | NP_001025470.1; | 695 | cow |
| A7MBJ1 | Maturin; Maturin neural progenitor differentiation regulator protein homolog; | MTURN; | NP_001094716.1; | 131 | cow |
| Q17QT2 | Microtubule-associated tumor suppressor 1 homolog; Mitochondrial tumor suppressor 1 homolog; | MTUS1; | NP_001069160.1; | 467 | cow |
| Q2TBS1 | Metaxin-1; Mitochondrial outer membrane import complex protein 1; | MTX1; | NP_001035698.1; | 317 | cow |
| Q8MI01 | Mucin-15; MUC-15; Component II; Glycoprotein 4; Glycoprotein C; PAS3; PASIII; | MUC15; | NP_788804.1; | 330 | cow |
| Q8WML4 | Mucin-1; MUC-1; CD antigen CD227; [Cleaved into: Mucin-1 subunit alpha (MUC1-NT) (MUC1-alpha); Mucin-1 subunit beta (MUC1-beta) (MUC1-CT)]; | MUC1; | NP_776540.1; | 580 | cow |
| Q2YDH0 | Sialomucin core protein 24; MUC-24; Endolyn; CD antigen CD164; | CD164; | NP_001039506.1; | 198 | cow |
| P98091 | Submaxillary mucin-like protein; | NULL | NULL | 563 | cow |
| Q08DK9 | PWWP domain-containing protein MUM1; Mutated melanoma-associated antigen 1; MUM-1; | MUM1; | NP_001069090.1;XP_005209345.1;XP_005209346.1; | 641 | cow |
| A5PJI6 | Muscle-related coiled-coil protein; Muscle-restricted coiled-coil protein; | MURC; | NP_001096734.2; | 361 | cow |
| Q9GK13 | Methylmalonyl-CoA mutase, mitochondrial; MCM; EC 5.4.99.2; Methylmalonyl-CoA isomerase; | MUT; MCM; | NULL | 750 | cow |
| Q0P570 | Diphosphomevalonate decarboxylase; EC 4.1.1.33; MDDase; Mevalonate pyrophosphate decarboxylase; Mevalonate (diphospho)decarboxylase; | MVD; | NP_001068892.1; | 400 | cow |
| Q3SYU9 | Major vault protein; MVP; | MVP; | NP_001030394.1; | 890 | cow |
| P79135 | Interferon-induced GTP-binding protein Mx1; Myxoma resistance protein 1; Myxovirus resistance protein 1; [Cleaved into: Interferon-induced GTP-binding protein Mx1, N-terminally processed]; | MX1; | NP_776365.1;XP_005202046.1;XP_005202047.1;XP_005202048.1; | 648 | cow |
| Q9BDI7 | Interferon-induced GTP-binding protein Mx2; Myxovirus resistance protein 2; | MX2; | NP_776366.1; | 710 | cow |
| Q148M6 | Matrix-remodeling-associated protein 8; Limitrin; | MXRA8; | NP_001069298.1; | 463 | cow |
| P46200 | Transcriptional activator Myb; Proto-oncogene c-Myb; | MYB; | NULL | 640 | cow |
| Q2TBP7 | C-Myc-binding protein; Associate of Myc 1; AMY-1; | MYCBP; AMY1; | NP_001033654.1; | 103 | cow |
| Q2HJ27 | Myc proto-oncogene protein; Proto-oncogene c-Myc; Transcription factor p64; | MYC; | NP_001039539.1;XP_005215381.1; | 439 | cow |
