| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species | 
| Q27967 | Secreted phosphoprotein 24; Spp-24; Secreted phosphoprotein 2; | SPP2; SPP24; | NP_776613.2; | 203 | cow | 
| P13213 | SPARC; Basement-membrane protein 40; BM-40; Osteonectin; ON; Secreted protein acidic and rich in cysteine; | SPARC; | NP_776889.1; | 303 | cow | 
| Q17QK8 | Sepiapterin reductase; SPR; EC 1.1.1.153; | SPR; | NP_001069471.1; | 267 | cow | 
| A0RZB4 | Shadow of prion protein; Protein shadoo; | SPRN; | NP_001073790.1; | 143 | cow | 
| A5D979 | SprT-like domain-containing protein Spartan; Protein with SprT-like domain at the N terminus; Spartan; | SPRTN; | NP_001091551.1; | 487 | cow | 
| Q2T9X3 | SPRY domain-containing protein 7; Chronic lymphocytic leukemia deletion region gene 6 protein homolog; CLL deletion region gene 6 protein homolog; | SPRYD7; CLLD6; | NP_001033295.1; | 196 | cow | 
| Q0VC82 | Selenide, water dikinase 1; EC 2.7.9.3; Selenium donor protein 1; Selenophosphate synthase 1; | SEPHS1; | NP_001068784.1;XP_005214232.1; | 392 | cow | 
| Q5E9X6 | SPRY domain-containing SOCS box protein 1; SSB-1; | SPSB1; SSB1; | NP_001029381.1; | 273 | cow | 
| Q3MHZ2 | SPRY domain-containing SOCS box protein 3; SSB-3; | SPSB3; SSB3; | NP_001029678.1;XP_005224505.1; | 345 | cow | 
| Q3SZA5 | Spermine synthase; SPMSY; EC 2.5.1.22; Spermidine aminopropyltransferase; | SMS; | NP_001030548.1; | 365 | cow | 
| Q3SZQ3 | Spermatogenesis-associated protein 19, mitochondrial; | SPATA19; | NP_001069966.1; | 154 | cow | 
| Q2TA20 | Spermatogenesis-associated protein 22; | SPATA22; | NP_001033275.1; | 364 | cow | 
| Q32P96 | Spermatogenesis-associated protein 45; | SPATA45; | NP_001070492.1; | 97 | cow | 
| Q3SYX6 | Transcription elongation factor SPT4; DRB sensitivity-inducing factor small subunit; DSIF small subunit; | SUPT4H1; | NP_001029964.1;XP_005219990.1; | 117 | cow | 
| Q3MHG1 | Serine palmitoyltransferase 1; EC 2.3.1.50; Long chain base biosynthesis protein 1; LCB 1; Serine-palmitoyl-CoA transferase 1; SPT 1; SPT1; | SPTLC1; | NP_001029921.1; | 473 | cow | 
| Q5E978 | Serine palmitoyltransferase small subunit A; Small subunit of serine palmitoyltransferase A; ssSPTa; | SPTSSA; SSSPTA; | NP_001181971.1; | 68 | cow | 
| Q0IIK4 | Serine palmitoyltransferase small subunit B; Protein ADMP; Small subunit of serine palmitoyltransferase B; ssSPTb; | SPTSSB; ADMP SSSPTB; | NP_001104244.1; | 76 | cow | 
| Q58CV5 | Sugar phosphate exchanger 2; Solute carrier family 37 member 2; | SLC37A2; SPX2; | NP_001019657.1; | 491 | cow | 
| Q17QZ3 | Sugar phosphate exchanger 3; Solute carrier family 37 member 3; | SLC37A3; SPX3; | NP_001068752.1; | 495 | cow | 
| Q0VC44 | Spexin; NPQ; Neuropeptide Q; Spexin hormone; [Cleaved into: Spexin-1; Spexin-2 (NPQ 53-70)]; | SPX; | NP_001068875.1; | 116 | cow | 
