| Nuclear inhibitor of protein phosphatase 1 (NIPP-1) (Protein phosphatase 1 regulatory inhibitor subunit 8) | Ppp1r8 Nipp1 | Q8R3G1 | 3 |
| Nuclear pore complex protein Nup160 (160 kDa nucleoporin) (Gene trap locus 1-13 protein) (GTL-13) (Nucleoporin Nup160) | Nup160 Gtl1-13 Kiaa0197 | Q9Z0W3 | 3 |
| Nuclear pore complex protein Nup54 (54 kDa nucleoporin) (Nucleoporin Nup54) | Nup54 | Q8BTS4 | 3 |
| Nuclear pore complex protein Nup85 (85 kDa nucleoporin) (FROUNT) (Nucleoporin Nup85) (Pericentrin-1) | Nup85 Pcnt1 | Q8R480 | 3 |
| Nuclear prelamin A recognition factor (Iron-only hydrogenase-like protein 2) (IOP2) | Narf | Q9CYQ7 | 3 |
| Nuclear protein MDM1 (Mdm4 transformed 3T3 cell double minute 1 protein) (Mouse double minute 1) | Mdm1 Mdm-1 | Q9D067 | 3 |
| Nuclear receptor coactivator-6 beta | Ncoa6 | F6M2J9 | 3 |
| Nuclear receptor ROR-alpha (Nuclear receptor RZR-alpha) (Nuclear receptor subfamily 1 group F member 1) (Retinoid-related orphan receptor-alpha) | Rora Nr1f1 Rzra | P51448 | 3 |
| Nuclear receptor subfamily 4 group A member 1 (Nuclear hormone receptor NUR/77) (Nuclear protein N10) (Orphan nuclear receptor HMR) | Nr4a1 Gfrp Hmr N10 Nur77 | P12813 | 3 |
| Nuclear receptor-binding factor 2 (NRBF-2) | Nrbf2 | Q8VCQ3 | 3 |
| Nuclear transcription factor Y subunit beta (CAAT box DNA-binding protein subunit B) (Nuclear transcription factor Y subunit B) (NF-YB) | Nfyb | P63139 | 3 |
| Nuclear valosin-containing protein-like (NVLp) (Nuclear VCP-like protein) | Nvl | Q9DBY8 | 3 |
| Nuclear-interacting partner of ALK (Nuclear-interacting partner of anaplastic lymphoma kinase) (mNIPA) (Zinc finger C3HC-type protein 1) | Zc3hc1 Nipa | Q80YV2 | 3 |
| Nucleolar complex protein 4 homolog (NOC4 protein homolog) (NOC4-like protein) (Nucleolar complex-associated protein 4-like protein) | Noc4l | Q8BHY2 | 3 |
| Nucleoporin Nup37 (Nup107-160 subcomplex subunit Nup37) | Nup37 | Q9CWU9 | 3 |
| NudC domain-containing protein 2 | Nudcd2 D11Ertd603e | Q9CQ48 | 3 |
| NXPE family member 2 (Protein FAM55B) | Nxpe2 Fam55b | Q3U095 | 3 |
| O-acetyl-ADP-ribose deacetylase MACROD1 (EC 3.2.2.-) (EC 3.5.1.-) (MACRO domain-containing protein 1) (Protein LRP16) ([Protein ADP-ribosylglutamate] hydrolase) | Macrod1 Lrp16 | Q922B1 | 3 |
| OCIA domain-containing protein 1 | Ociad1 Asrij | Q9CRD0 | 3 |
| Odorant receptor K4h11 (Olfactory receptor 971) (Olfactory receptor MOR171-13) (Olfactory receptor Olfr971) (Protein Olfr971) | Olfr971 mCG_60399 | Q9EQ96 | 3 |
| Odorant receptor M34 (Olfactory receptor 959) (Olfactory receptor MOR224-3) (Olfactory receptor Olfr959) (Protein Olfr959) | Olfr959 | Q9EQ86 | 3 |
| Odorant receptor ORZ6 (Olfactory receptor 459) (Olfactory receptor MOR120-1) (Protein Olfr459) | Olfr459 Orz6 mCG_141964 | Q924H8 | 3 |
| Odorant-binding protein 2a (Epididymal-specific lipocalin-13) | Obp2a Lcn13 | Q8K1H9 | 3 |
| Olfactory receptor 1019 (Olfactory receptor 180-1) | Olfr1019 Mor180-1 | Q8VGS3 | 3 |
| Olfactory receptor 1030 (Olfactory receptor 196-2) | Olfr1030 Mor196-2 | Q8VFL5 | 3 |
| Olfactory receptor 109 (Olfactory receptor MOR250-1) (Olfactory receptor Olfr109) (Protein Olfr109) | Olfr109 mCG_64039 | Q8VG96 | 3 |
| Olfactory receptor 1137 (Olfactory receptor Olfr1137) (Protein Olfr1137) | Olfr1137 mCG_1039988 | Q7TR40 | 3 |
| Olfactory receptor 1228 (Olfactory receptor MOR233-1) (Protein Olfr1228) | Olfr1228 | Q8VGM9 | 3 |
| Olfactory receptor 1239 (Olfactory receptor MOR231-3) (Olfactory receptor Olfr1239) (Protein Olfr1239) | Olfr1239 mCG_59059 | Q8VGM8 | 3 |
| Olfactory receptor 1260 (Olfactory receptor MOR232-2) (Olfactory receptor Olfr1260) (Protein Olfr1260) | Olfr1260 mCG_141981 | Q8VGN9 | 3 |
| Olfactory receptor 1333 (Olfactory receptor Olfr1333) (Protein Olfr1333) | Olfr1333 | Q7TQV7 | 3 |
| Olfactory receptor 1346 (Olfactory receptor MOR103-6) (Olfactory receptor Olfr1346) (Protein Olfr1346) | Olfr1346 mCG_63663 | Q8VGH6 | 3 |
| Olfactory receptor 1368 (Olfactory receptor MOR256-15) (Olfactory receptor Olfr1368) (Protein Olfr1368) | Olfr1368 mCG_59013 | Q8VFG3 | 3 |
| Olfactory receptor 1410 (Olfactory receptor MOR208-2) (Olfactory receptor Olfr1410) | Olfr1410 mCG_56569 | Q8VFC5 | 3 |
| Olfactory receptor 1436 (Protein Olfr1436) | Olfr1436 | A0PK57 | 3 |
| Olfactory receptor 1491 (Olfactory receptor MOR266-8) (Olfactory receptor Olfr1491) (Protein Olfr1491) | Olfr1491 | Q8VEZ5 | 3 |
| Olfactory receptor 1494 (Olfactory receptor MOR266-1) (Olfactory receptor Olfr1494) (Protein Olfr1494) | Olfr1494 Olfr1491 mCG_58967 | Q8VGP8 | 3 |
| Olfactory receptor 1495 (Olfactory receptor MOR266-9) (Olfactory receptor Olfr1495) (Protein Olfr1495) | Olfr1495 mCG_58968 | Q8VEZ4 | 3 |
| Olfactory receptor 1497 (Olfactory receptor MOR212-1) (Olfactory receptor Olfr1497) (Protein Olfr1497) | Olfr1497 mCG_53400 | Q8VG11 | 3 |
| Olfactory receptor 1507 (Protein Olfr1507) | Olfr1507 | Q0VEP0 | 3 |
| Olfactory receptor 1509 (Olfactory receptor Olfr1509) (Protein Olfr1509) | Olfr1509 mCG_18707 | Q7TQQ0 | 3 |
| Olfactory receptor 1537 (Odorant receptor K4) (Olfactory receptor 144) (Olfactory receptor 7B) | Olfr1537 Olfr144 Olfr7 | P34983 | 3 |
| Olfactory receptor 187 | Olfr187 | E9QNM5 | 3 |
| Olfactory receptor 19 (Odorant receptor M12) (Olfactory receptor 140-1) | Olfr19 Mor140-1 | Q9JHB2 | 3 |
| Olfactory receptor 272 (Olfactory receptor MOR262-7) (Olfactory receptor Olfr272) (Protein Olfr272) | Olfr272 mCG_56267 | Q8VGA0 | 3 |
| Olfactory receptor 275 (Olfactory receptor Olfr275) (Protein Olfr275) | Olfr275 mCG_140590 | Q7TS18 | 3 |
| Olfactory receptor 309 (Olfactory receptor Olfr309) (Protein Olfr309) | Olfr309 mCG_1028183 | Q7TS01 | 3 |
| Olfactory receptor 357 (Olfactory receptor MOR138-3) (Olfactory receptor Olfr357) (Protein Olfr357) | Olfr357 | Q8VFP4 | 3 |
| Olfactory receptor 415 | Olfr248 Olfr415 | A2RS36 | 3 |
| Olfactory receptor 472 (Olfactory receptor 204-5) | Olfr472 Mor204-5 | Q8VG43 | 3 |
| Olfactory receptor 490 (Olfactory receptor 204-17) | Olfr490 Mor204-17 | Q8VFD2 | 3 |
| Olfactory receptor 5 (Odorant receptor M41) (Olfactory receptor 103-8) | Olfr5 Mor103-8 | Q60889 | 3 |
| Olfactory receptor 533 (Olfactory receptor Olfr533) (Protein Olfr533) | Olfr533 | Q7TRT7 | 3 |
| Olfactory receptor 578 (Olfactory receptor MOR7-1) (Olfactory receptor Olfr578) (Protein Olfr578) | Olfr578 mCG_142231 | Q8VH17 | 3 |
| Olfactory receptor 594 (Olfactory receptor Olfr594) (Protein Olfr594) | Olfr594 mCG_141500 | Q7TRR4 | 3 |
| Olfactory receptor 681 (Protein Olfr681) | Olfr681 | Q3SXH8 | 3 |
| Olfactory receptor 701 (Olfactory receptor 701, isoform CRA_a) (Olfactory receptor MOR283-1) (Olfactory receptor Olfr701) (Protein Olfr701) | Olfr701 mCG_120439 | Q9D3U9 | 3 |
| Olfactory receptor 734 (Olfactory receptor MOR242-1) (Olfactory receptor Olfr734) (Protein Olfr734) | Olfr734 mCG_66458 | Q8VFT4 | 3 |
| Olfactory receptor 796 (Olfactory receptor MOR269-1) (Olfactory receptor Olfr796) (Protein Olfr796) | Olfr796 mCG_140956 | Q8VGJ1 | 3 |
| Olfactory receptor 812 (Olfactory receptor MOR110-1) (Olfactory receptor Olfr812) (Protein Olfr812) | Olfr812 mCG_141081 | Q8VG64 | 3 |
| Olfactory receptor 866 (Olfactory receptor MOR145-5) (Protein Olfr866) | Olfr866 | Q8VFI7 | 3 |
| Olfactory receptor 985 (Olfactory receptor MOR171-4) (Olfactory receptor Olfr985) (Protein Olfr985) | Olfr985 mCG_141921 | Q8VGB4 | 3 |
| Olfactory receptor MOR135-1 (Olfactory receptor Olfr380) (Protein Olfr380) | Olfr380 | Q8VGT3 | 3 |
| Olfactory receptor MOR171-23 (Protein Olfr919) | Olfr919 | Q8VF78 | 3 |
| Olfactory receptor MOR177-10 (Olfactory receptor Olfr1141) (Protein Olfr1141) | Olfr1141 | Q8VFQ7 | 3 |
| Olfactory receptor MOR183-3 | Olfr197 | Q8VFB8 | 3 |
| Olfactory receptor MOR230-8 (Olfactory receptor Olfr1199) (Protein Olfr1199) | Olfr1199 Olfr1209 | Q8VF94 | 3 |
| Olfactory receptor MOR31-2 (Olfactory receptor Olfr690) (Olfr690 protein) (Protein Olfr690) | Olfr690 | Q8VH18 | 3 |
| Olfactory receptor Olfr1178 (Protein Olfr1178) | Olfr1178 | Q7TR20 | 3 |
| Olfactory receptor Olfr1490 (Protein Olfr1490) | Olfr1490 | Q7TQQ5 | 3 |
| Olfactory receptor Olfr538 (Protein Olfr538) | Olfr538 | Q7TRT5 | 3 |
| Olfactory receptor Olfr917 (Protein Olfr917) | Olfr917 | Q7TRC3 | 3 |
| Olfactory receptor Olfr963 (Protein Olfr963) | Olfr963 | Q7TRA9 | 3 |
| Olfactory receptor Olfr967 (Protein Olfr967) | Olfr967 | Q7TRA6 | 3 |
| Olfr915 protein (Fragment) | Olfr915 | Q2NL45 | 3 |
| Optic atrophy 3 protein homolog | Opa3 | Q505D7 | 3 |
| Origin recognition complex subunit 1 | Orc1 Orc1l | Q9Z1N2 | 3 |
| Origin recognition complex subunit 2 | Orc2 Orc2l | Q60862 | 3 |
| Origin recognition complex subunit 5 | Orc5 Orc5l | Q9WUV0 | 3 |
| Origin recognition complex subunit 6 | Orc6 Orc6l | Q3TQX1 | 3 |
| Ornithine decarboxylase antizyme 1 (ODC-Az) | Oaz1 Oaz | P54369 | 3 |
| Osteoclast-stimulating factor 1 (SH3 domain protein 3) | Ostf1 Sh3d3 Sh3p2 | Q62422 | 3 |
| Otoferlin (Fer-1-like protein 2) | Otof Fer1l2 | Q9ESF1 | 3 |
| Outer dense fiber protein 3-like protein 2 | Odf3l2 Gm1157 | Q3TZ65 | 3 |
| Oviduct-specific glycoprotein (Estrogen-dependent oviduct protein) (Oviductal glycoprotein) (Oviductin) | Ovgp1 Chit5 Ogp | Q62010 | 3 |
| Oxidoreductase NAD-binding domain-containing protein 1 (EC 1.-.-.-) | Oxnad1 | Q8VE38 | 3 |
| Oxysterols receptor LXR-beta (Liver X receptor beta) (Nuclear receptor subfamily 1 group H member 2) (Retinoid X receptor-interacting protein No.15) (Ubiquitously-expressed nuclear receptor) | Nr1h2 Lxrb Rip15 Unr Unr2 | Q60644 | 3 |
| P-selectin (CD62 antigen-like family member P) (Granule membrane protein 140) (GMP-140) (Leukocyte-endothelial cell adhesion molecule 3) (LECAM3) (Platelet activation dependent granule-external membrane protein) (PADGEM) (CD antigen CD62P) | Selp Grmp | Q01102 | 3 |
| P2X purinoceptor | P2rx4 | Q3TR36 | 3 |
| P2Y purinoceptor 13 (P2Y13) (G-protein coupled receptor 86) | P2yr13 Gpr86 | Q9D8I2 | 3 |
| Paired box protein Pax-9 | Pax9 Pax-9 | P47242 | 3 |
| Paired mesoderm homeobox protein 1 (Homeobox protein K-2) (Homeobox protein mHox) (Paired-related homeobox protein 1) (PRX-1) | Prrx1 Pmx Pmx1 | P63013 | 3 |
| Palmitoyltransferase ZDHHC6 (EC 2.3.1.225) (H4 homolog) (Zinc finger DHHC domain-containing protein 6) (DHHC-6) | Zdhhc6 | Q9CPV7 | 3 |
| Paralemmin-1 (Paralemmin) | Palm | Q9Z0P4 | 3 |
| Paraneoplastic antigen Ma3 homolog | Pnma3 | Q8JZW8 | 3 |
| Paxillin | Pxn | Q8VI36 | 3 |
| Pcdh24 protein | Cdhr2 Pcdh24 | B9EJ32 | 3 |
| Pecanex-like protein 3 | Pcnxl3 | Q8VI59 | 3 |
| Peflin (PEF protein with a long N-terminal hydrophobic domain) (Penta-EF hand domain-containing protein 1) | Pef1 | Q8BFY6 | 3 |
| Peptide chain release factor 1, mitochondrial (MRF-1) (MtRF-1) | Mtrf1 | Q8K126 | 3 |