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Inhibition of JCV production by RNAi in SVG-A cells. Extracts prepared from JCV-infected cells 36 h after transfection with the indicated siRNAs were assayed for hemagglutination activity (HA). The data are expressed as HA titers per 25 μl of cell extract and are means ± SD of values from at least three independent experiments. **, P < 0.02 versus the value for cells transfected with the scrambled siRNA.
