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.

在本论文的第主要是对人尿苷胞苷激（UCK，EC 2.7.1.48）进行的系列研究。