| Solute carrier family 26 member 9 (Anion transporter/exchanger protein 9) | Slc26a9 | Q8BU91 | 3 |
| Solute carrier family 35 member F6 (ANT2-binding protein) (ANT2BP) (Transport and Golgi organization 9 homolog) | Slc35f6 | Q8VE96 | 3 |
| Solute carrier family 45 member 4 | Slc45a4 Kiaa1126 | Q0P5V9 | 3 |
| Solute carrier family 52, riboflavin transporter, member 2 (Porcine endogenous retrovirus A receptor 2 homolog) (PERV-A receptor 2 homolog) (Protein GPR172B) (Riboflavin transporter 1) (mRFT1) | Slc52a2 Gpr172b Rft1 | Q9D8F3 | 3 |
| Solute carrier organic anion transporter family member 1A4 (Sodium-independent organic anion-transporting polypeptide 2) (Solute carrier family 21 member 5) | Slco1a4 Oatp1a4 Oatp2 Slc21a5 | Q9EP96 | 3 |
| Solute carrier organic anion transporter family member 2B1 (Solute carrier family 21 member 9) | Slco2b1 Oatp2b1 Slc21a9 | Q8BXB6 | 3 |
| Sorting nexin-12 (SDP8 protein) | Snx12 | O70493 | 3 |
| Sorting nexin-14 | Snx14 | Q8BHY8 | 3 |
| Sorting nexin-27 | Snx27 Kiaa0488 | Q3UHD6 | 3 |
| SOSS complex subunit C (INTS3- and NABP-interacting protein) (Sensor of single-strand DNA complex subunit C) (Sensor of ssDNA subunit C) (SOSS-C) (Single-stranded DNA-binding protein-interacting protein 1) (SSB-interacting protein 1) | Inip Ssbip1 | Q3TXT3 | 3 |
| SPARC-like protein 1 (Extracellular matrix protein 2) (Matrix glycoprotein Sc1) | Sparcl1 Ecm2 Sc1 | P70663 | 3 |
| Spectrin beta 1 (Spectrin beta 1, isoform CRA_b) (Spectrin beta chain, erythrocytic) | Sptb Spnb1 mCG_123942 | Q3UGX2 | 3 |
| Spectrin beta chain, non-erythrocytic 1 (Beta-II spectrin) (Embryonic liver fodrin) (Fodrin beta chain) | Sptbn1 Elf Spnb-2 Spnb2 Sptb2 | Q62261 | 3 |
| Speriolin-like protein (Spermatogenesis and centriole-associated protein 1-like protein) | Spatc1l | Q9D9W0 | 3 |
| Sperm equatorial segment protein 1 | Spesp1 | Q9D5A0 | 3 |
| Sperm-associated antigen 11 | Spag11 Bin1b Ep2e | Q8K4N2 | 3 |
| Spermatid nuclear transition protein 1 (STP-1) (TP-1) | Tnp1 | P10856 | 3 |
| Spermatid-specific manchette-related protein 1 (Ciliated bronchial epithelial protein 1) | Smrp1 Cbe1 | Q2MH31 | 3 |
| Spermatogenesis-associated protein 16 | Spata16 | Q8C636 | 3 |
| Spermatogenesis-associated protein 19, mitochondrial (Spermatogenic cell-specific gene 1 protein) (Spergen-1) | Spata19 Spergen1 | Q9DAQ9 | 3 |
| Sphingomyelin phosphodiesterase (EC 3.1.4.12) (Acid sphingomyelinase) (aSMase) | Smpd1 Asm | Q04519 | 3 |
| Sphingosine 1-phosphate receptor 5 (S1P receptor 5) (S1P5) (Endothelial differentiation G-protein-coupled receptor 8) (Lysophospholipid receptor B4) (Sphingosine 1-phosphate receptor Edg-8) (S1P receptor Edg-8) | S1pr5 Edg8 Lpb4 | Q91X56 | 3 |
| Sphingosine kinase 2 (SK 2) (SPK 2) (EC 2.7.1.91) | Sphk2 | Q9JIA7 | 3 |
| Spindle and centriole-associated protein 1 (Coiled-coil domain-containing protein 52) | Spice1 Ccdc52 D16Ertd480e | Q8C804 | 3 |
| Splicing factor 3B subunit 1 (Splicing factor 3b, subunit 1) | Sf3b1 mCG_117542 | G5E866 | 3 |
| Splicing factor 3B subunit 3 (Pre-mRNA-splicing factor SF3b 130 kDa subunit) (SF3b130) (Spliceosome-associated protein 130) (SAP 130) | Sf3b3 Kiaa0017 | Q921M3 | 3 |
| Splicing factor 3B subunit 4 | Sf3b4 | Q8QZY9 | 3 |
| Splicing factor 3B subunit 5 (SF3b5) (Pre-mRNA-splicing factor SF3b 10 kDa subunit) | Sf3b5 Sf3b10 | Q923D4 | 3 |
| SPRY domain-containing protein 7 (Chronic lymphocytic leukemia deletion region gene 6 protein homolog) (CLL deletion region gene 6 protein homolog) | Spryd7 Clld6 | Q3TFQ1 | 3 |
| SPRY domain-containing SOCS box protein 3 (SSB-3) | Spsb3 Kiaa4204 Ssb3 Tce1 | Q571F5 | 3 |
| Src substrate cortactin | Cttn Ems1 | Q60598 | 3 |
| Src-like-adapter (Src-like-adapter protein 1) (SLAP-1) (mSLAP) | Sla Slap Slap1 | Q60898 | 3 |
| SRSF protein kinase 2 (EC 2.7.11.1) (SFRS protein kinase 2) (Serine/arginine-rich protein-specific kinase 2) (SR-protein-specific kinase 2) [Cleaved into: SRSF protein kinase 2 N-terminal; SRSF protein kinase 2 C-terminal] | Srpk2 | O54781 | 3 |
| StAR-related lipid transfer protein 6 (START domain-containing protein 6) (StARD6) | Stard6 | P59096 | 3 |
| STE20-related kinase adapter protein alpha (STRAD alpha) (STE20-related adapter protein) | Strada Lyk5 Strad | Q3UUJ4 | 3 |
| Sterile alpha motif domain-containing protein 10 (SAM domain-containing protein 10) | Samd10 | Q7TST3 | 3 |
| Sterile alpha motif domain-containing protein 3 (SAM domain-containing protein 3) | Samd3 Gm623 | Q8C4H2 | 3 |
| Store-operated calcium entry-associated regulatory factor (SARAF) (SOCE-associated regulatory factor) (Transmembrane protein 66) | Tmem66 Saraf | Q8R3Q0 | 3 |
| Striatin-interacting protein 1 (Protein FAM40A) | Strip1 Fam40a Kiaa1761 | Q8C079 | 3 |
| Stromal membrane-associated protein 1 | Smap1 | Q91VZ6 | 3 |
| Structural maintenance of chromosomes protein 5 (SMC protein 5) (SMC-5) (mSMC5) (Protein expressed in male leptotene and zygotene spermatocytes 453) (MLZ-453) | Smc5 Kiaa0594 Smc5l1 | Q8CG46 | 3 |
| Substance-K receptor (SKR) (NK-2 receptor) (NK-2R) (Neurokinin A receptor) (Tachykinin receptor 2) | Tacr2 Tac2r | P30549 | 3 |
| Succinate dehydrogenase assembly factor 2, mitochondrial (SDH assembly factor 2) (Succinate dehydrogenase subunit 5, mitochondrial) | Sdhaf2 Pgl2 Sdh5 | Q8C6I2 | 3 |
| Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial (CybS) (CII-4) (QPs3) (Succinate dehydrogenase complex subunit D) (Succinate-ubiquinone oxidoreductase cytochrome b small subunit) (Succinate-ubiquinone reductase membrane anchor subunit) | Sdhd | Q9CXV1 | 3 |
| SUN domain-containing protein 2 (Protein unc-84 homolog B) (Sad1/unc-84 protein-like 2) | Sun2 Unc84b | Q8BJS4 | 3 |
| Suppressor APC domain-containing protein 2 (Protein Ang) | Sapcd2 | Q9D818 | 3 |
| Suppressor of cytokine signaling 7 (SOCS-7) | Socs7 Cish7 Nap4 | Q8VHQ2 | 3 |
| Suppressor of SWI4 1 homolog (Ssf-1) (Peter Pan homolog) | Ppan Ssf1 | Q91YU8 | 3 |
| Survival of motor neuron-related-splicing factor 30 (30 kDa splicing factor SMNrp) (SMN-related protein) (Survival motor neuron domain-containing protein 1) | Smndc1 Smnr Spf30 | Q8BGT7 | 3 |
| Synaptobrevin homolog YKT6 (EC 2.3.1.-) | Ykt6 | Q9CQW1 | 3 |
| Synaptojanin-2-binding protein (Activin receptor-interacting protein 2) (Activin receptor-interacting protein 4) (Mitochondrial outer membrane protein 25) | Synj2bp Arip2 Omp25 | Q9D6K5 | 3 |
| Synergin gamma (AP1 subunit gamma-binding protein 1) (Gamma-synergin) | Synrg Ap1gbp1 Syng | Q5SV85 | 3 |
| Syntaxin-8 (Syntaxin-like protein 3I35) | Stx8 | O88983 | 3 |
| T-cell surface glycoprotein CD3 eta chain (T-cell receptor T3 eta chain) | Cd247 Cd3z Tcrz | P29020 | 3 |
| T-cell-specific surface glycoprotein CD28 (CD antigen CD28) | Cd28 | P31041 | 3 |
| T-complex protein 1 subunit epsilon (TCP-1-epsilon) (CCT-epsilon) | Cct5 Ccte Kiaa0098 | P80316 | 3 |
| T-complex protein 1 subunit eta (TCP-1-eta) (CCT-eta) | Cct7 Ccth | P80313 | 3 |
| T-complex protein 1 subunit theta (TCP-1-theta) (CCT-theta) | Cct8 Cctq | P42932 | 3 |
| T-lymphoma invasion and metastasis-inducing protein 1 | Tiam1 | E9Q1R7 | 3 |
| TBC1 domain family member 20 | Tbc1d20 | Q9D9I4 | 3 |
| TBC1 domain family member 22A | Tbc1d22a D15Ertd781e | Q8R5A6 | 3 |
| TBC1 domain family member 5 | Tbc1d5 | Q80XQ2 | 3 |
| TBC1 domain family member 9B | Tbc1d9b Kiaa0676 | Q5SVR0 | 3 |
| TCF3 fusion partner homolog (Protein FB1) (Protein amida) | Tfpt Amida | Q3U1J1 | 3 |
| Tctex1 domain-containing protein 2 | Tctex1d2 | Q9CQ66 | 3 |
| Teashirt homolog 1 (Serologically defined colon cancer antigen 3 homolog) | Tshz1 Kiaa4206 Sdccag33 Tsh1 | Q5DTH5 | 3 |
| Telomerase protein component 1 (Telomerase-associated protein 1) (Telomerase protein 1) (p240) (p80 telomerase homolog) | Tep1 Tp1 | P97499 | 3 |
| Testis-specific H1 histone (Haploid germ cell-specific nuclear protein 1) (Histone H1t2) | H1fnt Hanp1 | Q8CJI4 | 3 |
| Testis-specific serine kinase substrate (Testis-specific kinase substrate) (STK22 substrate 1) | Tsks Stk22s1 | O54887 | 3 |
| Testisin (EC 3.4.21.-) (Serine protease 21) (Tryptase 4) | Prss21 | Q9JHJ7 | 3 |
| Tetraspanin-33 (Tspan-33) (Penumbra) (mPen) (Proerythroblast new membrane) | Tspan33 Pen | Q8R3S2 | 3 |
| Tetratricopeptide repeat protein 28 (TPR repeat protein 28) | Ttc28 Kiaa1043 Tprbk | Q80XJ3 | 3 |
| Tetratricopeptide repeat protein GNN (TPR repeat protein GNN) (Grp94-neighboring nucleotidase) | Gnn | Q692V3 | 3 |
| TGF-beta-activated kinase 1 and MAP3K7-binding protein 1 (Mitogen-activated protein kinase kinase kinase 7-interacting protein 1) (TGF-beta-activated kinase 1-binding protein 1) (TAK1-binding protein 1) | Tab1 Map3k7ip1 | Q8CF89 | 3 |
| Thioredoxin (Trx) (ATL-derived factor) (ADF) | Txn Txn1 | P10639 | 3 |
| Thioredoxin-like protein 4A (DIM1 protein homolog) (Spliceosomal U5 snRNP-specific 15 kDa protein) (Thioredoxin-like U5 snRNP protein U5-15kD) | Txnl4a Dim1 Txnl4 | P83877 | 3 |
| Thioredoxin-related transmembrane protein 4 (Thioredoxin domain-containing protein 13) | Tmx4 D2Bwg1356e Kiaa1162 Txndc13 | Q8C0L0 | 3 |
| THO complex subunit 4 (Tho4) (Ally of AML-1 and LEF-1) (Aly/REF export factor) (REF1-I) (RNA and export factor-binding protein 1) (Transcriptional coactivator Aly/REF) | Alyref Aly Ref1 Refbp1 THOC4 | O08583 | 3 |
| THUMP domain-containing protein 3 (GtROSA26asSor) | Thumpd3 | P97770 | 3 |
| Thymidylate kinase (EC 2.7.4.9) (dTMP kinase) | Dtymk Tmk | P97930 | 3 |
| Titin | Ttn | E9Q8N1 | 3 |
| Traf2 and NCK-interacting protein kinase (EC 2.7.11.1) | Tnik Kiaa0551 | P83510 | 3 |
| Trafficking protein particle complex subunit 12 (Tetratricopeptide repeat protein 15) (TPR repeat protein 15) | Trappc12 Ttc15 | Q8K2L8 | 3 |
| Trafficking protein particle complex subunit 2 (Sedlin) | Trappc2 Sedl | Q9CQP2 | 3 |
| Trans-2-enoyl-CoA reductase, mitochondrial (EC 1.3.1.38) | Mecr Nrbf1 | Q9DCS3 | 3 |
| Transcobalamin-2 (TC-2) (Transcobalamin II) (TC II) (TCII) | Tcn2 | O88968 | 3 |
| Transcription and mRNA export factor ENY2 (Enhancer of yellow 2 transcription factor homolog) | Eny2 | Q9JIX0 | 3 |
| Transcription cofactor vestigial-like protein 3 | Vgll3 | E9Q1Y1 | 3 |
| Transcription factor 7-like 2 (HMG box transcription factor 4) (T-cell-specific transcription factor 4) (T-cell factor 4) (TCF-4) (mTCF-4) | Tcf7l2 Tcf4 | Q924A0 | 3 |
| Transcription factor A, mitochondrial (mtTFA) (Testis-specific high mobility group protein) (TS-HMG) | Tfam Hmgts | P40630 | 3 |
| Transcription factor GATA-5 (GATA-binding factor 5) | Gata5 | P97489 | 3 |
| Transcription factor HIVEP3 (Human immunodeficiency virus type I enhancer-binding protein 3 homolog) (KB-binding and recognition component) (Kappa-B and V(D)J recombination signal sequences-binding protein) (Kappa-binding protein 1) (KBP-1) (Recombinant component) (Schnurri-3) (Zinc finger protein ZAS3) | Hivep3 KBP1 Kiaa1555 Krc Rc shn3 Zas3 | A2A884 | 3 |
| Transcription factor jun-B (MyD21) | Junb Jun-b | P09450 | 3 |
| Transcription factor SOX-12 | Sox12 Sox-12 | Q04890 | 3 |
| Transcriptional adapter 1 (Transcriptional adapter 1-like protein) | Tada1 Tada1l | Q99LM9 | 3 |
| Transcriptional enhancer factor TEF-5 (DTEF-1) (ETF-related factor 1) (ETFR-1) (TEA domain family member 3) (TEAD-3) | Tead3 Tcf13r2 Tef5 | P70210 | 3 |
| Transcriptional repressor CTCFL (Brother of the regulator of imprinted sites) (CCCTC-binding factor) (CTCF paralog) (CTCF-like protein) | Ctcfl Boris | A2APF3 | 3 |
| Transducin-like enhancer protein 1 (Groucho-related protein 1) (Grg-1) | Tle1 Grg1 | Q62440 | 3 |
| Transformer-2 protein homolog alpha | Tra2a | E9QP00 | 3 |
| Transgelin-2 (SM22-beta) | Tagln2 Kiaa0120 | Q9WVA4 | 3 |