| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species | 
| Q3T134 | Signal peptidase complex subunit 1; EC 3.4.-.-; Microsomal signal peptidase 12 kDa subunit; SPase 12 kDa subunit; | SPCS1; | NP_001029576.1;XP_005222829.1; | 102 | cow | 
| Q3SZU5 | Signal peptidase complex subunit 3; EC 3.4.-.-; Microsomal signal peptidase 22/23 kDa subunit; SPC22/23; SPase 22/23 kDa subunit; | SPCS3; | NP_001070461.1; | 180 | cow | 
| Q08DR9 | Protein Spindly; Coiled-coil domain-containing protein 99; Spindle apparatus coiled-coil domain-containing protein 1; | SPDL1; CCDC99; | NP_001070322.1; | 603 | cow | 
| A5D796 | Spermatogenesis-defective protein 39 homolog; SPE-39; VPS33B-interacting protein in apical-basolateral polarity regulator; VPS33B-interacting protein in polarity and apical restriction; | VIPAS39; SPE39 VIPAR; | NP_001091469.1; | 481 | cow | 
| Q58DA1 | Sperm flagellar protein 1; | SPEF1; | NP_001029594.1; | 236 | cow | 
| Q32LJ5 | Spermatid maturation protein 1; | SPEM1; | NP_001073054.2; | 313 | cow | 
| A6QQS3 | Spermatid-associated protein; | SPERT; | NP_001095767.1;XP_005213736.1; | 455 | cow | 
| Q32KL7 | Sperm equatorial segment protein 1; | SPESP1; | NP_001073241.1; | 366 | cow | 
| Q3T045 | Survival of motor neuron-related-splicing factor 30; Survival motor neuron domain-containing protein 1; | SMNDC1; SPF30; | NP_001030414.1; | 238 | cow | 
| A0JNJ3 | Spartin; | SPG20; | NP_001071464.1; | 668 | cow | 
| Q8MJJ1 | Maspardin; Spastic paraplegia 21 autosomal recessive Mast syndrome protein homolog; | SPG21; | NP_991341.1; | 308 | cow | 
| Q2T9X8 | Spindle and centriole-associated protein 1; Coiled-coil domain-containing protein 52; | SPICE1; CCDC52; | NP_001033206.1; | 860 | cow | 
| Q1RML4 | Transcription factor Spi-C; | SPIC; | NP_001069889.1;XP_005206760.1; | 248 | cow | 
| Q2KI39 | Spindlin-2; Spindlin-like protein 2; SPIN-2; | SPIN2; | NP_001073238.1;XP_005228298.1;XP_005228299.1; | 258 | cow | 
| P79124 | Short palate, lung and nasal epithelium carcinoma-associated protein 2A; BSP30a; Common salivary protein form a; | SPLUNC2A; BSP30A; | NP_777228.2; | 239 | cow | 
| P79125 | Short palate, lung and nasal epithelium carcinoma-associated protein 2B; BSP30b; Common salivary protein form b; | SPLUNC2B; BSP30B; | NP_777227.1; | 240 | cow | 
| Q2TBK8 | Snurportin-1; RNA U transporter 1; | SNUPN; RNUT1; | NP_001033635.1;XP_005222004.1;XP_005222005.1;XP_005222006.1;XP_005222007.1;XP_005222008.1; | 362 | cow | 
| Q08DX7 | Protein spinster homolog 1; | SPNS1; | NP_001070276.1; | 528 | cow | 
| Q9GLX9 | Spondin-1; F-spondin; Vascular smooth muscle cell growth-promoting factor; | SPON1; VSGP; | NP_777168.1; | 807 | cow | 
| Q0VCW1 | Speckle-type POZ protein; | SPOP; | NP_001069404.1;XP_005220628.1;XP_005220629.1; | 374 | cow | 
