FIG. 9.
Effects of overexpressed transgene-directed siRNAs on transgene expression. Cells were activated by transfection with phTet-Off, together with the indicated pSilencer plasmids. The relative CFP mRNA levels in cells expressing transgene-directed siRNAs were determined by normalizing the ratios of CFP mRNA to β-actin mRNA against that of control cells cotransfected with pSilencer-negative. The mean values and standard deviations from three independent experiments using the average value of triplicate RT-PCRs are shown.