Table 1. Sequences of primers used in RT-PCR.

Gene	Primer sequences	Productlength (bp)
ABCB1	Forward, 5′-TTTGGTGCCATGGCCGTGGG-3′Reverse, 5′-CGATGCCCAGGTGTGCTCGG-3′	400
ABCC1	Forward, 5′-ATGTCACGTGGAATACCAGC-3′Reverse, 5′-GAAGACTGAACTCCCTTCCT-3′	349
ABCG2	Forward, 5′-GGGTTCTCTTCTTCCTGACGACC-3′Reverse, 5′-TGGTTGTGAGATTGACCAACAGACC-3′	389
GAPDH	Forward, 5′-GAGTCAACGGATTTGGTCGT-3′Reverse, 5′-GACAAGCTTCCCGTTCTCAG-3′	185