It is like cytidine, but with one oxygen atom removed.

Deoxycytidine is a compound and a nucleoside.

Uridine-cytidine kinase (UCK) (EC 2.7.1.48) is a pyrimidine ribonucleoside kinase that catalyzes the phosphorylation of uridine and cytidine to UMP and CMP.

在本论文章中主要是对人尿苷胞苷激酶（UCK，EC 2.7.1.48）基系列研究。