Figure 2.
Graphs showing the effect of ribonucleases on the proliferation of HeLa, K-562, and Hep-3B cells transfected with pGE-pos or pGE-neg. Cell proliferation was measured by monitoring the incorporation of [methyl-3H]thymidine into genomic DNA. Data points indicate the mean (±SE) of three separate experiments carried out in triplicate. Open symbols, pGE-neg; filled symbols, pGE-pos. Values of IC50 are listed in Table 1.