H/F-LV IS distribution in hCD34⁺cells. Unstimulated (G₀) or cytokine-stimulated CD34 cells (Stim) were transduced with H/F-LVs for 24 hours, washed, and kept in culture for 10 days and were processed for LV genomic IS analysis. (A) The percentage of lentiviral ISs located in RefSeq genes, in known genes, and in transcribed genes. Statistical tests have been performed by comparing the experimental data to the in silico–generated random IS data set (in gray). (B) The percentage of lentiviral ISs located in RefSeq genes, transcriptional start sites, DNAse I–sensitive sites, or CpG-dense regions, including the surrounding 2-kb, 4-kb, or 10-kb surrounding regions are shown. Statistical tests were performed by comparing the experimental data with the in silico–generated random IS data set (in gray). The asterisks indicate the statistically significant differences between the unstimulated (G₀) or cytokine-stimulated CD34⁺ cell conditions and the corresponding random data set. *P < .001. TSS, transcriptional start site.