Immunogen sequence: VNILKQLCED WEVVPEPVAR WCNVQSTQDE FEELTMSQKN GGNVLQMMYE KPERWSFTFQ TYACLSRIRA QLASLNGKLK D. Deoxycytidine kinase (DCK) is required for the phosphorylation of several deoxyribonucleosides and their nucleoside analogs. Deficiency of DCK