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Effect of As2O3 (1 µM) on the expression levels of P-gp, MRP1 and LRP mRNA inHBx-HepG2 cells pretreated with hypoxia (1 % O2). qRT-PCR assay was used to examine the effect of As2O3 on the expression levels of a P-gp, b MRP1 and c LRP mRNA in HBx-HepG2 cells pretreated with hypoxia (1 % O2). All data were expressed as mean ± s.e.m., n = 4; significantly differences between hypoxia (1 % O2) group and hypoxia (1 % O2) + ATO group were indicated as *P < 0.05, **P < 0.01 (unpaired t-test)
