FIG 4 .

Mean read count at sites with at least one insertion for data sets made with the Himar1 transposon (A) and the Tn5 transposon (B). The nonpermissive sites (white bar), which match the nonpermissive motif identified in this study, significantly suppressed the read counts relative to sites that do not match the motif (permissive sites; grey bar). In contrast, limiting the analysis of the Tn5 data sets to only insertions at TA dinucleotides, the mean read counts are similar for the permissive and nonpermissive sites. Error bars show the standard errors of the means.