Summary plots across the TSS. The distribution of STRs in the upstream regulatory region of the human genome shows distinct trends around the TSS and core promoter. All lines are smoothed by LOWESS (locally weighted scatterplot smoothing) regression. (A) The density of STaRRRT STRs across the 3 kb upstream regulatory region. This run chart shows the STR density of the 5,264 STRs from STaRRRT at each base position in the regulatory region with a regression line also fitted to the data. (B) STaRRRT STR density decomposed into periods. (C) The number of STR repeat units across the TSS. (D) The percentage of bases in each STR across the TSS.