- M
- Major allergen
- Major pollen allergen
- Mite allergen
- MTARC1
- MSH
- Melatonin receptor
- MSP
- MD-2
- MAdCAM
- MLF
- MTFP
- MIF
- MGB2
- MDR-NUDIX
- Melanoma derived growth regulator
- MS4A
- MTOR
- MANSC1
- MERP1
- MSN
- MFRP
- MBNL
- MSLN
- MTF1
- MYT1
- MLC1
- MCAM
- MEN1
- MIR10B
- MIR17
- MIR18A
- MIR21
- MIR27A
- MIR31
- MIR100
- MIR122
- MIR126
- MIR132
- MIR133
- MIR145
- MIR146
- MIR155
- MIR192
- MIR205
- MIR210
- MIR214
- MIR221
- MIR222
- MIR328
- MIR466
- MIR485
- MIR574
- MIR710
- MIRLET7
- MIRLET7A
- MIRLET7A1
- MIRLET7C
- MGEA5
- MTAN
- MTHFD2
- MTHFD1L
- MurD
- MOCS
- Mannosyltransferase
- MenA
- Methyltransferase
- MurA
- MbtA
- Mca
- Mycolic acid synthase
- MreB
- MRRF
- MSP1
- MSP3
- MAG
- MAdCAM-1
- MCSF
- MDK
- MIA
- Mitochondrial complex I
- MTRF1
- MALAT1
- MBD
- MKI67
- MYOCD
- MSTN
- MR1
- MLKL
- MZB1
- MSMB
- MAL
- MAL2
- MS4A4
- MS4A6A
- MYD88
- MFGE8
- MOG
- MMR
- MBNL1
- MBNL2