Effect of NF90 on RANTES promoter activity in HepG2 cell lines. Effect of NF90 protein expression on RANTES promoter activity in controls HepG2 and Hepswx cell lines as well as in Hep39 was investigated by co-transfection experiments as described in Material and Methods section. Results are expressed as the relative light units (RLU) of luciferase activity in each cell extract that was equalized for each sample. Data shown are the means of two independent transfections and three aliquots of cell extracts were analyzed in each experiment. the standard deviation is indicated by the error bars; statistical significance (p < 0.05) was determined by Student's t-test for differences.