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.

在文的第章中主要是对人尿苷胞苷激酶（UCK，EC 2.7.1.48）基因进行的研究。