| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P80457 | Xanthine dehydrogenase/oxidase; XOR; EC 1.17.1.4; Xanthine oxidoreductase; EC 1.17.3.2; XO; XD; | XDH; | NP_776397.1; | 1332 | cow |
| A5D785 | Exportin-2; Exp2; Chromosome segregation 1-like protein; Importin-alpha re-exporter; | CSE1L; XPO2; | NP_001014933.2; | 971 | cow |
| Q1JPJ2 | Xaa-Pro aminopeptidase 1; EC 3.4.11.9; Aminoacylproline aminopeptidase; Cytosolic aminopeptidase P; Soluble aminopeptidase P; sAmp; X-Pro aminopeptidase 1; X-prolyl aminopeptidase 1, soluble; | XPNPEP1; | NP_001069070.1;XP_005225789.1;XP_005225790.1;XP_005225791.1; | 623 | cow |
| Q08DH8 | DNA repair protein XRCC3; X-ray repair cross-complementing protein 3; | XRCC3; | NP_001071585.1; | 341 | cow |
| Q7PCK7 | X-ray radiation resistance-associated protein 1; Fragment; | XRRA1; | NP_976069.1; | 549 | cow |
| Q3SYZ6 | Xylulose kinase; Xylulokinase; EC 2.7.1.17; | XYLB; | NP_001029655.1; | 490 | cow |
| Q5QQ49 | Xylosyltransferase 2; EC 2.4.2.26; Peptide O-xylosyltransferase 2; Xylosyltransferase II; | XYLT2; | NP_001008667.1; | 867 | cow |
| P67808 | Nuclease-sensitive element-binding protein 1; CCAAT-binding transcription factor I subunit A; CBF-A; DNA-binding protein B; DBPB; Enhancer factor I subunit A; EFI-A; Y-box transcription factor; Y-box-binding protein 1; YB-1; | YBX1; NSEP1 YB1; | NP_777240.1; | 324 | cow |
| Q3T196 | Protein YIF1A; YIP1-interacting factor homolog A; | YIF1A; | NP_001029441.1; | 293 | cow |
| Q5E9E8 | Protein YIPF5; YIP1 family member 5; | YIPF5; | NP_001029715.1; | 257 | cow |
| A6QLC6 | Protein YIPF6; YIP1 family member 6; | YIPF6; | NP_001094676.1; | 236 | cow |
| A5D7K7 | Protein YIPF7; YIP1 family member 7; | YIPF7; | NP_001096728.1;XP_005207977.1; | 255 | cow |
| Q3T000 | Synaptobrevin homolog YKT6; EC 2.3.1.-; | YKT6; | NP_001030219.1; | 198 | cow |
| Q2YDI3 | Protein yippee-like 2; | YPEL2; | NP_001072978.1;XP_005219986.1;XP_005219987.1;XP_005219988.1;XP_005219989.1; | 119 | cow |
| A6QPH8 | Protein yippee-like 3; | YPEL3; | NP_001192338.1; | 119 | cow |
| Q3ZBE7 | Protein yippee-like 5; | YPEL5; | NP_001073261.1;XP_005212943.1;XP_005212944.1; | 121 | cow |
| Q0VC80 | YrdC domain-containing protein, mitochondrial; | YRDC; | NP_001069018.1; | 276 | cow |
| Q0VCZ3 | YTH domain-containing family protein 2; | YTHDF2; | NP_001069721.1; | 580 | cow |
| P82292 | Spermadhesin Z13; | NULL | NULL | 116 | cow |
| Q3ZCH5 | Zinc-alpha-2-glycoprotein; Zn-alpha-2-GP; Zn-alpha-2-glycoprotein; | AZGP1; | NP_001029503.1; | 299 | cow |
