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mRNA levels of HBx, cyclin A, cyclin D1 and cyclin E genes in renal tubular epithelial cells in the control, empty and HBx groups were determined by reverse transcription-quantitative polymerase chain reaction. Cells transfected with empty plasmid pcDNA3.1(+) and recombinant plasmid pcDNA3.1(+)-HBx were designated as the empty and HBx groups, respectively. Cells without transfection served as the control group. *P<0.05 vs. empty group. HBx, hepatitis B virus X protein.
