NCIt definition : Thymidine kinase, cytosolic (234 aa, 25 kDa) is encoded by the human TK1 gene. This
protein plays a role in pyrimidine metabolism.;
NCIt note : The enzymatic activity of thymidine kinase, cytosolic is tied to the cell cycle. Its
activity is high in proliferating cells and peaks during the S-phase of the cell cycle,
while resting cells demonstrate low activity. (UniProt);