Table 1. Sequences of primers used in reverse transcription–PCR.

Gene	Forward primer (5′–3′)	Reverse primer (5′–3′)
hENT1	AAAGGAGAGGAGCCAAGAGC	GGCCCAACCAGTCAAAGATA
dCK	CCCGCATCAAGAAAATCTCC	TCATCCAGTCATGCCAGTC
RRM1	GGAGGAATTGGTGTTGCTGT	GCTGCTCTTCCTTTCCTGTG
RRM2	CCCGCTGTTTCTATGGCTTC	CCCAGTCTGCCTTCTTCTTG
GAPDH	ATGACCACAGTCCATGCCAT	TTGAAGTCAGAGGAGACCAC

Abbreviations: dCK=deoxycytidine kinase; GAPDH=glyceraldehyde-3-phosphate dehydrogenase; hENT1=human equilibrative nucleoside transporter-1.