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Expression levels of dCK, ABCC5, hENT1 and RRM1 genes in PC-6, PC-6/MTA-0.4, PC6/MTA-1.6 and PC6/5FU23-26 cells, as determined by real-time PCR. *P<0.05. dCK, deoxycytidine kinase; ABCC5, multidrug resistance protein 5; hENT1, human equilibrative nucleoside transporter 1; RRM1, ribonucleoside reductase subunit M1.
