| Squalene synthase | FDFT1 | E9PS69 | 1 |
| Squalene synthase (SQS) (SS) (EC 2.5.1.21) (FPP:FPP farnesyltransferase) (Farnesyl-diphosphate farnesyltransferase) | FDFT1 | B3KQ95 | 1 |
| Squamous cell carcinoma antigen 2 | SERPINB4 | Q86W05 | 1 |
| Squamous cell carcinoma antigen recognized by T-cells 3 (Fragment) | SART3 | F8VV04 | 1 |
| SRA stem-loop-interacting RNA-binding protein, mitochondrial (Fragment) | SLIRP | H0YJ40 | 1 |
| SRPR protein | SRPR | Q6IAX9 | 1 |
| SRR1-like protein (SRR1 domain-containing protein) | SRRD SRR1L | Q9UH36 | 1 |
| SRSF protein kinase 2 (Fragment) | SRPK2 | H7C5L6 | 1 |
| Stabilizer of axonemal microtubules 1 | SAXO1 C9orf138 FAM154A | Q8IYX7 | 1 |
| STAG3-like protein 3 (Stromal antigen 3-like protein 3) | STAG3L3 | Q7L5M5 | 1 |
| STAGA complex 65 subunit gamma (Adenocarcinoma antigen ART1) (SPTF-associated factor 65 gamma) (STAF65gamma) (Suppressor of Ty 7-like) | SUPT7L KIAA0764 | O94864 | 1 |
| STAM-binding protein | STAMBP | F5H5B9 | 1 |
| STAM-binding protein (Fragment) | STAMBP | C9JEK5 | 1 |
| STAM-binding protein (Fragment) | STAMBP | C9JK83 | 1 |
| Stanniocalcin-2 (Fragment) | STC2 | H0YB13 | 1 |
| Staphylococcal nuclease domain-containing protein 1 (Fragment) | SND1 | H7C597 | 1 |
| StAR-related lipid transfer protein 13 (46H23.2) (Deleted in liver cancer 2 protein) (DLC-2) (Rho GTPase-activating protein) (START domain-containing protein 13) (StARD13) | STARD13 DLC2 GT650 | Q9Y3M8 | 1 |
| StAR-related lipid transfer protein 7, mitochondrial (Fragment) | STARD7 | C9JTD3 | 1 |
| STARD3 N-terminal-like protein (Fragment) | STARD3NL | C9JJ39 | 1 |
| START domain-containing protein 10 (Fragment) | STARD10 | F5GWK5 | 1 |
| START domain-containing protein 10 (Fragment) | STARD10 | F5H1Z6 | 1 |
| Stathmin | STMN2 | E5RGX5 | 1 |
| Stathmin | STMN1 | Q96CE4 | 1 |
| Stathmin (Fragment) | STMN3 | A0A0J9YXY4 | 1 |
| Stathmin-2 (Superior cervical ganglion-10 protein) (Protein SCG10) | STMN2 SCG10 SCGN10 | G3V110 | 1 |
| STE20-related kinase adapter protein alpha (STRAD alpha) (STE20-related adapter protein) (Serologically defined breast cancer antigen NY-BR-96) | STRADA LYK5 STRAD | Q7RTN6 | 1 |
| STEAP family member 1B (Fragment) | STEAP1B | C9JL51 | 1 |
| Stearoyl-CoA desaturase variant (Fragment) | 0 | Q59GX7 | 1 |
| Sterile alpha motif domain-containing protein 11 (Fragment) | SAMD11 | H7C3J6 | 1 |
| Sterile alpha motif domain-containing protein 3 (SAM domain-containing protein 3) | SAMD3 | Q8N6K7 | 1 |
| Sterile alpha motif domain-containing protein 5 (SAM domain-containing protein 5) | SAMD5 SAMDC1 | Q5TGI4 | 1 |
| Steroid 21-hydroxylase (EC 1.14.14.16) (21-OHase) (Cytochrome P-450c21) (Cytochrome P450 21) (Cytochrome P450 XXI) (Cytochrome P450-C21) (Cytochrome P450-C21B) | CYP21A2 CYP21 CYP21B | P08686 | 1 |
| Steroid 21-hydroxylase (Fragment) | CYP21A2 | E7EN87 | 1 |
| Sterol regulatory element-binding protein 2 (SREBP-2) (Class D basic helix-loop-helix protein 2) (bHLHd2) (Sterol regulatory element-binding transcription factor 2) [Cleaved into: Processed sterol regulatory element-binding protein 2] | SREBF2 BHLHD2 SREBP2 | Q12772 | 1 |
| Stimulated by retinoic acid gene 6 protein homolog | STRA6 PP14296 UNQ3126/PRO10282/PRO19578 | F5GYI8 | 1 |
| Stomatin-like protein 3 (SLP-3) | STOML3 | B4E285 | 1 |
| STON2 protein (Fragment) | STON2 | Q6NT15 | 1 |
| Store-operated calcium entry-associated regulatory factor | SARAF | E5RJV6 | 1 |
| Store-operated calcium entry-associated regulatory factor (SARAF) (SOCE-associated regulatory factor) (HBV X-transactivated gene 3 protein) (HBV XAg-transactivated protein 3) (Protein FOAP-7) (Transmembrane protein 66) | SARAF TMEM66 XTP3 HSPC035 NPD003 PSEC0019 UNQ1967/PRO4499 | Q96BY9 | 1 |
| Storkhead-box protein 1 (Winged-helix domain-containing protein) | STOX1 C10orf24 | Q6ZVD7 | 1 |
| Stress-70 protein, mitochondrial (Fragment) | HSPA9 | H0YBG6 | 1 |
| Striated muscle preferentially-expressed protein kinase (Fragment) | SPEG | C9J8D8 | 1 |
| Striatin-3 | STRN3 | G3V340 | 1 |
| Striatin-4 | STRN4 | F5GYK2 | 1 |
| Striatin-4 (Fragment) | STRN4 | M0QZM0 | 1 |
| Stromal cell-derived factor 2 (Fragment) | SDF2 | K7ELH6 | 1 |
| Stromal interaction molecule 2 | STIM2 | H0Y860 | 1 |
| Structural maintenance of chromosomes protein | SMC1A | G8JLG1 | 1 |
| Structural maintenance of chromosomes protein 3 (SMC protein 3) (SMC-3) (Basement membrane-associated chondroitin proteoglycan) (Bamacan) (Chondroitin sulfate proteoglycan 6) (Chromosome-associated polypeptide) (hCAP) | SMC3 BAM BMH CSPG6 SMC3L1 | A8K156 | 1 |
| Structural maintenance of chromosomes protein 4 | SMC4 | F8WCB7 | 1 |
| Structural maintenance of chromosomes protein 6 (Fragment) | SMC6 | H7C3J8 | 1 |
| STXBP1 protein (Syntaxin binding protein 1, isoform CRA_a) | stxbp1 STXBP1 hCG_17280 | Q68CM6 | 1 |
| Succinate dehydrogenase assembly factor 2, mitochondrial | SDHAF2 | M0QY91 | 1 |
| Succinate dehydrogenase assembly factor 2, mitochondrial (SDH assembly factor 2) (SDHAF2) | SDHAF2 C11orf79 PGL2 SDH5 | Q9NX18 | 1 |
| Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial (EC 1.3.5.1) | 0 | B4DYN5 | 1 |
| Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial (EC 1.3.5.1) (Flavoprotein subunit of complex II) (Fp) | SDHA SDH2 SDHF | Q8IW48 | 1 |
| Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial (Fragment) | SDHA | H0Y8X1 | 1 |
| Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial (Fragment) | SDHA | H0Y8S2 | 1 |
| Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial (EC 1.3.5.1) (Fragment) | SDHB | A0A087WWT1 | 1 |
| Succinate--CoA ligase [ADP-forming] subunit beta, mitochondrial (EC 6.2.1.5) (ATP-specific succinyl-CoA synthetase subunit beta) (A-SCS) (Succinyl-CoA synthetase beta-A chain) (SCS-betaA) | SUCLA2 | E5KS60 | 1 |
| Succinate--CoA ligase [ADP-forming] subunit beta, mitochondrial (Fragment) | SUCLA2 | Q5T9Q5 | 1 |
| Succinate--CoA ligase [GDP-forming] subunit beta, mitochondrial (Fragment) | SUCLG2 | H0Y852 | 1 |
| Succinate-semialdehyde dehydrogenase, mitochondrial | ALDH5A1 | C9J8Q5 | 1 |
| Succinyl-CoA:3-ketoacid coenzyme A transferase 2, mitochondrial (EC 2.8.3.5) (3-oxoacid CoA-transferase 2A) (Testis-specific succinyl-CoA:3-oxoacid CoA-transferase) (SCOT-t) | OXCT2 FKSG25 | Q9BYC2 | 1 |
| Sugar phosphate exchanger 3 | SLC37A3 | F8WF28 | 1 |
| Sulfatase-modifying factor 1 (EC 1.8.99.-) (C-alpha-formylglycine-generating enzyme 1) | SUMF1 FGE PSEC0152 UNQ3037/PRO9852 | Q8NBK3 | 1 |
| Sulfhydryl oxidase (EC 1.8.3.2) | 0 | A8K4C2 | 1 |
| Sulfhydryl oxidase (EC 1.8.3.2) | GFER hCG_42694 | H3BQQ4 | 1 |
| Sulfhydryl oxidase (EC 1.8.3.2) (Fragment) | QSOX2 | H0Y430 | 1 |
| Sulfide dehydrogenase like (Fragment) | 0 | Q53HW7 | 1 |
| Sulfotransferase (EC 2.8.2.-) | 0 | B7Z2E1 | 1 |
| Sulfotransferase (EC 2.8.2.-) | SULT1A2 | E9PKW4 | 1 |
| Sulfotransferase (EC 2.8.2.-) (Fragment) | SULT1E1 | H0Y8G0 | 1 |
| Sulfotransferase (EC 2.8.2.-) (Fragment) | SULT1C2 | H7C420 | 1 |
| Sulfotransferase (EC 2.8.2.-) (Fragment) | SULT1A4 SULT1A3 | H3BRT0 | 1 |
| Sulfotransferase 1C3 (ST1C3) (EC 2.8.2.2) | SULT1C3 | Q6IMI6 | 1 |
| Sulfotransferase 1C4 (ST1C4) (EC 2.8.2.-) (Sulfotransferase 1C2) (SULT1C#2) | SULT1C4 SULT1C2 | O75897 | 1 |
| SUMO-conjugating enzyme (EC 2.3.2.-) | 0 | A8K503 | 1 |
| SUN domain-containing protein 3 | SUN3 | A0A0A0MSG9 | 1 |
| SUN domain-containing protein 3 (Fragment) | SUN3 | H7BZA7 | 1 |
| SUN domain-containing protein 3 (Sad1/unc-84 domain-containing protein 1) | SUN3 SUNC1 | Q8TAQ9 | 1 |
| Superoxide dismutase (EC 1.15.1.1) | SOD2 | A0A0C4DFU2 | 1 |
| Superoxide dismutase (EC 1.15.1.1) (Fragment) | SOD2 | F5H3C5 | 1 |
| Superoxide dismutase (EC 1.15.1.1) (Fragment) | SOD2 | G8JLJ2 | 1 |
| Superoxide dismutase [Cu-Zn] (EC 1.15.1.1) (Superoxide dismutase 1) (hSod1) | SOD1 | Q16711 | 1 |
| Suppression of tumorigenicity 18 protein | ST18 | E5RFE8 | 1 |
| Suppression of tumorigenicity 18 protein (Zinc finger protein 387) | ST18 KIAA0535 ZNF387 | O60284 | 1 |
| Suppression of tumorigenicity 5 protein (cDNA FLJ55510, highly similar to Suppression of tumorigenicity 5) | ST5 | B4DDL8 | 1 |
| Suppression of tumorigenicity 5 protein (DENN domain-containing protein 2B) (HeLa tumor suppression 1) | ST5 DENND2B HTS1 | P78524 | 1 |
| Suppression of tumorigenicity 5 protein (Fragment) | ST5 | E9PLH6 | 1 |
| Suppression of tumorigenicity 5 protein (Fragment) | ST5 | E9PLR2 | 1 |
| Suppressor APC domain-containing protein 2 (Tumor specificity and mitosis phase-dependent expression protein) (TS/MDEP) (p42.3) | SAPCD2 C9orf140 | Q86UD0 | 1 |
| Suppressor of cytokine signaling 3 (SOCS-3) (Cytokine-inducible SH2 protein 3) (CIS-3) (STAT-induced STAT inhibitor 3) (SSI-3) | SOCS3 CIS3 SSI3 | O14543 | 1 |
| Suppressor of cytokine signaling 4 (SOCS-4) (Suppressor of cytokine signaling 7) (SOCS-7) | SOCS4 SOCS7 | Q8WXH5 | 1 |
| Suppressor of cytokine signaling 6 (SOCS-6) (Cytokine-inducible SH2 protein 4) (CIS-4) (Suppressor of cytokine signaling 4) (SOCS-4) | SOCS6 CIS4 SOCS4 | O14544 | 1 |
| Suppressor of tumorigenicity 14 protein (EC 3.4.21.109) (Matriptase) (Membrane-type serine protease 1) (MT-SP1) (Prostamin) (Serine protease 14) (Serine protease TADG-15) (Tumor-associated differentially-expressed gene 15 protein) | ST14 PRSS14 SNC19 TADG15 | Q9HB36 | 1 |
| Suppressor of tumorigenicity 7 protein | ST7 | E7EMS3 | 1 |
| Suppressor of tumorigenicity 7 protein (Protein FAM4A1) (Protein HELG) | ST7 FAM4A1 HELG RAY1 | Q9NRC1 | 1 |
| Suprabasin | SBSN UNQ698/PRO1343 | E9PBV3 | 1 |
| Surfeit locus protein 2 (Surf-2) | SURF2 | Q15527 | 1 |