Deoxycytidine is a nucleoside that is essential for DNA synthesis. This molecule has a deoxyribose sugar connected to a cytosine base via a glycosidic linkage. Other terms for this molecule include 2'-deoxycytidine, 1-beta-d-2'-deoxyribofuranosylcytosine, and 2'-deoxy-beta-D-cytidine. The term deoxyadenosine is often used interchangeably with deoxycytidine, but they are two separate nucleosides that differ by their nitrogenous base. Deoxycytidine is converted to deoxycytidine triphosphate (dCTP), which is a building block for DNA synthesis and repair. This molecule plays a critical role in the maintenance of the genetic material in all cells.