1: Kewn S, Hoggard PG, Sales SD, Johnson MA, Back DJ. The intracellular activation of lamivudine (3TC) and determination of 2'-deoxycytidine-5'-triphosphate (dCTP) pools in the presence and absence of various drugs in HepG2 cells. Br J Clin Pharmacol. 2000 Dec;50(6):597-604. 2: Nonaka M, Tsuchimoto D, Sakumi K, Nakabeppu Y. Mouse RS21-C6 is a mammalian 2'-deoxycytidine 5'-triphosphate pyrophosphohydrolase that prefers 5-iodocytosine. FEBS J. 2009 Mar;276(6):1654-66. doi: 10.1111/j.1742-4658.2009.06898.x. Epub 2009 Feb 7.