| NUAK family SNF1-like kinase 1 (EC 2.7.11.1) (AMPK-related protein kinase 5) (Omphalocele kinase 1) | Nuak1 Kiaa0537 Omphk1 | Q641K5 | 1 |
| NUAK family SNF1-like kinase 2 (EC 2.7.11.1) (Omphalocele kinase 2) | Nuak2 Omphk2 | Q8BZN4 | 1 |
| Nuclear apoptosis-inducing factor 1 | Naif1 | Q6PFD7 | 1 |
| Nuclear fragile X mental retardation-interacting protein 1 (Nuclear FMRP-interacting protein 1) | Nufip1 | Q9QXX8 | 1 |
| Nuclear pore complex protein Nup155 (155 kDa nucleoporin) (Nucleoporin Nup155) | Nup155 | Q99P88 | 1 |
| Nuclear pore complex protein Nup88 (88 kDa nucleoporin) (Nucleoporin Nup88) | Nup88 | Q8CEC0 | 1 |
| Nuclear pore complex protein Nup93 (93 kDa nucleoporin) (CBP-interacting protein 4) (Nucleoporin Nup93) | Nup93 Cip4 Kiaa0095 | Q8BJ71 | 1 |
| Nuclear pore complex protein Nup98-Nup96 [Cleaved into: Nuclear pore complex protein Nup98 (98 kDa nucleoporin) (Nucleoporin Nup98) (Nup98); Nuclear pore complex protein Nup96 (96 kDa nucleoporin) (Nucleoporin Nup96) (Nup96)] | Nup98 | Q6PFD9 | 1 |
| Nuclear receptor ROR-beta (Nuclear receptor RZR-beta) (Nuclear receptor subfamily 1 group F member 2) (Retinoid-related orphan receptor-beta) | Rorb Nr1f2 | Q8R1B8 | 1 |
| Nuclear receptor subfamily 2 group F member 6 (COUP transcription factor 3) (COUP-TF3) (V-erbA-related protein 2) (EAR-2) | Nr2f6 Ear-2 Ear2 Erbal2 | P43136 | 1 |
| Nuclear receptor subfamily 4 group A member 2 (NUR-related factor 1) (Orphan nuclear receptor NURR1) | Nr4a2 Nurr1 | Q06219 | 1 |
| Nuclear speckle splicing regulatory protein 1 (Coiled-coil domain-containing protein 55) (Nuclear speckle-related protein 70) (NSrp70) | Nsrp1 Ccdc55 Nsrp70 | Q5NCR9 | 1 |
| Nucleobindin-2 (DNA-binding protein NEFA) (Prepronesfatin) [Cleaved into: Nesfatin-1] | Nucb2 Nefa | P81117 | 1 |
| Nucleolar GTP-binding protein 2 | Gnl2 | Q99LH1 | 1 |
| Nucleolar MIF4G domain-containing protein 1 (SGD1 homolog) | Nom1 Gm1040 | Q3UFM5 | 1 |
| Nucleolar protein 12 (Nucleolar protein of 25 kDa) | Nol12 Nop25 | Q8BG17 | 1 |
| Nucleolar protein 16 | Nop16 D13Wsu177e | Q9CPT5 | 1 |
| Nucleolar protein 3 | Nol3 | Q9D1X0 | 1 |
| Nucleolar protein 4 | Nol4 Gm1262 | P60954 | 1 |
| Nucleolar protein 6 (Nucleolar RNA-associated protein) (Nrap) | Nol6 | Q8R5K4 | 1 |
| Nucleolar protein 7 | Nol7 MNCb-1192 | Q9D7Z3 | 1 |
| Nucleoporin Nup43 (Nup107-160 subcomplex subunit Nup43) | Nup43 | P59235 | 1 |
| Nucleoporin NUP53 (35 kDa nucleoporin) (Mitotic phosphoprotein 44) (MP-44) (Nuclear pore complex protein Nup53) (Nucleoporin Nup35) | Nup35 Mp44 Nup53 | Q8R4R6 | 1 |
| Nucleoside diphosphate kinase 3 (NDK 3) (NDP kinase 3) (EC 2.7.4.6) (DR-nm23) (Nucleoside diphosphate kinase C) (NDPKC) (nm23-M3) | Nme3 | Q9WV85 | 1 |
| Nucleoside diphosphate kinase, mitochondrial (NDK) (NDP kinase, mitochondrial) (EC 2.7.4.6) (Nucleoside diphosphate kinase D) (NDPKD) (nm23-M4) | Nme4 | Q9WV84 | 1 |
| Nucleoside diphosphate-linked moiety X motif 6 (Nudix motif 6) (EC 3.6.1.-) (Antisense basic fibroblast growth factor B) | Nudt6 Asfgf2b | Q8CH40 | 1 |
| Nucleosome assembly protein 1-like 3 (Brain-specific protein MB20) | Nap1l3 Mb20 | Q794H2 | 1 |
| NudC domain-containing protein 3 | Nudcd3 Kiaa1068 | Q8R1N4 | 1 |
| Nurim (Nuclear envelope membrane protein) (Nuclear rim protein) | Nrm | Q8VC65 | 1 |
| Nutritionally-regulated adipose and cardiac-enriched protein | Nrac | Q8BNX7 | 1 |
| NXPE family member 4 (Protein FAM55D) | Nxpe4 Fam55d | Q52KP5 | 1 |
| O(6)-methylguanine-induced apoptosis 2 (MAPO2) (Sperm-tail PG-rich repeat-containing protein 1) | Stpg1 | Q9D2F5 | 1 |
| Obg-like ATPase 1 (GTP-binding protein 9) | Ola1 Gtpbp9 | Q9CZ30 | 1 |
| Odorant receptor M37 (Olfactory receptor 961) (Olfactory receptor MOR224-5) (Olfactory receptor Olfr961) (Protein Olfr961) | Olfr961 | Q9EQ84 | 1 |
| Odz3 protein | Tenm3 Odz3 | B7ZNJ5 | 1 |
| Olfactomedin-4 | Olfm4 | D3YYD0 | 1 |
| Olfactomedin-like 1 (Protein Olfml1) | Olfml1 BC047207 | Q8BSH2 | 1 |
| Olfactomedin-like protein 3 | Olfml3 | Q8BK62 | 1 |
| Olfactory receptor 1015 (Olfactory receptor Olfr1015) (Protein Olfr1015) | Olfr1015 mCG_54085 | Q7TR94 | 1 |
| Olfactory receptor 1037 (Olfactory receptor Olfr1037) (Protein Olfr1037) | Olfr1037 | Q7TR84 | 1 |
| Olfactory receptor 1099 (Olfactory receptor MOR206-3) (Olfactory receptor Olfr1099) (Protein Olfr1099) | Olfr1099 mCG_66525 | Q8VG37 | 1 |
| Olfactory receptor 1100 (Olfactory receptor MOR206-4) (Olfactory receptor Olfr1100) (Protein Olfr1100) | Olfr1100 mCG_66528 | Q8VFM1 | 1 |
| Olfactory receptor 1238 (Olfactory receptor MOR231-11) (Olfactory receptor Olfr1238) (Protein Olfr1238) | Olfr1238 mCG_59060 | Q8VG59 | 1 |
| Olfactory receptor 1250 (Olfactory receptor MOR231-7) (Olfactory receptor Olfr1250) (Protein Olfr1250) | Olfr1250 | Q8VGM3 | 1 |
| Olfactory receptor 13 (Odorant receptor K7) (Olfactory receptor 261-6) | Olfr13 Mor261-6 | P34984 | 1 |
| Olfactory receptor 1344 (Olfactory receptor Olfr1344) (Protein Olfr1344) | Olfr1344 | Q7TQV3 | 1 |
| Olfactory receptor 1364 (Protein Olfr1364) | Olfr1364 mCG_59011 | Q5SZS9 | 1 |
| Olfactory receptor 1420 (Olfactory receptor MOR266-4) (Olfactory receptor Olfr1420) (Protein Olfr1420) | Olfr1420 mCG_1045246 | Q8VF55 | 1 |
| Olfactory receptor 1447 (Olfactory receptor MOR202-3) (Protein Olfr1447) | Olfr1447 | Q8VFX3 | 1 |
| Olfactory receptor 145 (Odorant receptor K21) (Olfactory receptor 161-6) (Olfactory receptor 7C) | Olfr145 Mor161-6 Olfr7 | Q60882 | 1 |
| Olfactory receptor 1467 (Olfactory receptor MOR202-15) (Olfactory receptor Olfr1467) (Protein Olfr1467) | Olfr1467 mCG_58962 | Q8VFW1 | 1 |
| Olfactory receptor 17 (Fragment) | Olfr2 | Q80WD6 | 1 |
| Olfactory receptor 186 (Olfactory receptor 183-9) | Olfr186 Mor183-9 | Q8VEX5 | 1 |
| Olfactory receptor 222 (Olfactory receptor Olfr222) (Protein Olfr222) | Olfr222 | Q7TS30 | 1 |
| Olfactory receptor 24 (Olfactory receptor 132-1) (Olfactory receptor TPCR51) | Olfr24 Mor132-1 | Q8VFM9 | 1 |
| Olfactory receptor 270 (Olfactory receptor MOR262-9) (Protein Olfr270) | Olfr270 | Q8VFN0 | 1 |
| Olfactory receptor 30 (Olfactory receptor MOR281-1) (Olfactory receptor Olfr30) (Protein Olfr30) | Olfr30 mCG_66502 | Q8VGD8 | 1 |
| Olfactory receptor 303 (Olfactory receptor MOR104-2) (Olfactory receptor Olfr303) (Protein Olfr303) | Olfr303 | Q8VFP0 | 1 |
| Olfactory receptor 310 (Protein Olfr310) | Olfr310 | B2RVZ1 | 1 |
| Olfactory receptor 32 (Olfactory receptor Olfr32) (Protein Olfr32) | Olfr32 Olfr1271 mCG_141989 | Q7TQZ0 | 1 |
| Olfactory receptor 368 (Olfactory receptor MOR178-1) (Olfactory receptor Olfr368) (Protein Olfr368) | Olfr368 | Q8VF22 | 1 |
| Olfactory receptor 399 (Olfactory receptor Olfr399) (Protein Olfr399) | Olfr399 mCG_140793 | Q7TRX3 | 1 |
| Olfactory receptor 429 (Olfactory receptor Olfr429) (Protein Olfr429) | Olfr429 mCG_55416 | Q7TRW1 | 1 |
| Olfactory receptor 448 (Olfactory receptor MOR261-13) (Olfactory receptor Olfr448) (Protein Olfr448) | Olfr448 mCG_60445 | Q8VES9 | 1 |
| Olfactory receptor 453 (Olfactory receptor Olfr453) (Protein Olfr453) | Olfr453 mCG_141683 | Q7TRV7 | 1 |
| Olfactory receptor 469 (Olfactory receptor 204-21) | Olfr469 Mor204-21 | Q8VF66 | 1 |
| Olfactory receptor 52 (Olfactory receptor MOR185-6) (Olfactory receptor Olfr52) (Protein Olfr52) | Olfr52 mCG_51979 | Q8VFL0 | 1 |
| Olfactory receptor 524 (Olfactory receptor Olfr524) (Protein Olfr524) | Olfr524 | Q7TRU0 | 1 |
| Olfactory receptor 6 (Odorant receptor M50) (Olfactory receptor 103-16) | Olfr6 Mor103-16 | P34986 | 1 |
| Olfactory receptor 715 (Olfactory receptor MOR260-1) (Protein Olfr715) | Olfr715 | Q8VG49 | 1 |
| Olfactory receptor 727 (Protein Olfr727) | Olfr727 | A2RTN7 | 1 |
| Olfactory receptor 835 (Olfactory receptor Olfr835) (Protein Olfr835) | Olfr835 mCG_142357 | Q7TRG7 | 1 |
| Olfactory receptor 95 (Olfactory receptor MOR263-6) (Olfactory receptor Olfr95) (Protein Olfr95) | Olfr95 mCG_53404 | Q8VFE2 | 1 |
| Olfactory receptor 979 (Olfactory receptor MOR223-1) (Olfactory receptor Olfr979) (Protein Olfr979) | Olfr979 | Q8VH10 | 1 |
| Olfactory receptor MOR136-9 (Olfactory receptor Olfr347) (Protein Olfr347) | Olfr347 | Q8VGK2 | 1 |
| Olfactory receptor MOR187-2 (Protein Olfr1048) | Olfr1048 Olfr1008 Olfr1053 | Q8VGS2 | 1 |
| Olfactory receptor MOR189-1 (Protein Olfr1079) | Olfr1079 | Q8VF52 | 1 |
| Olfactory receptor MOR202-19 (Olfactory receptor Olfr1489) (Protein Olfr1489) | Olfr1489 | Q8VFQ5 | 1 |
| Olfactory receptor MOR224-2 (Olfactory receptor Olfr975) (Protein Olfr975) | Olfr975 | Q8VG91 | 1 |
| Olfactory receptor MOR251-1 (Olfactory receptor Olfr532) (Protein Olfr532) | Olfr532 | Q8VGT4 | 1 |
| Olfactory receptor MOR283-8 (Olfactory receptor Olfr693) (Protein Olfr693) | Olfr693 | Q8VF89 | 1 |
| Olfactory receptor Olfr1000 (Protein Olfr1000) | Olfr1000 | Q7TR99 | 1 |
| Olfactory receptor Olfr1148 (Protein Olfr1148) | Olfr1148 | Q7TR35 | 1 |
| Olfactory receptor Olfr1211 (Protein Olfr1211) | Olfr1211 | Q7TR09 | 1 |
| Olfactory receptor Olfr180 | Olfr180 | F8VQ90 | 1 |
| Olfactory receptor Olfr566 (Protein Olfr566) | Olfr566 | Q7TRS5 | 1 |
| Oligophrenin-1 | Ophn1 | Q99J31 | 1 |
| Oligoribonuclease, mitochondrial (EC 3.1.-.-) (RNA exonuclease 2 homolog) (Small fragment nuclease) | Rexo2 Smfn | Q9D8S4 | 1 |
| Opalin (Oligodendrocytic myelin paranodal and inner loop protein) (Transmembrane protein 10) | Opalin Tmem10 | Q7M750 | 1 |
| Optineurin | Optn | Q8K3K8 | 1 |
| Oral cancer-overexpressed protein 1 homolog | Oraov1 | Q8CH62 | 1 |
| ORM1-like protein 1 | Ormdl1 | Q921I0 | 1 |
| ORM1-like protein 2 | Ormdl2 | Q9CQZ0 | 1 |
| Ornithine decarboxylase antizyme 3 (AZ3) (ODC-Az 3) (OAZ-t) | Oaz3 | Q9R109 | 1 |
| OTU domain-containing protein 4 (EC 3.4.19.12) | Otud4 Kiaa1046 | B2RRE7 | 1 |
| OTU domain-containing protein 6B (EC 3.4.19.12) | Otud6b | Q8K2H2 | 1 |
| OTU domain-containing protein 7A (EC 3.4.19.12) (Zinc finger protein Cezanne 2) | Otud7a Cezanne2 Otud7 | Q8R554 | 1 |
| Outer dense fiber protein 2-like | Odf2l D3Ertd250e | Q9D478 | 1 |
| Ovarian cancer-associated gene 2 protein homolog | Ovca2 | Q9D7E3 | 1 |
| Ovostatin homolog | Ovos | Q3UU35 | 1 |