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Regions with significantly different levels of histone modification were identified by ChIPnorm and placed into 200 bp bins relative to the transcription start site (TSS). A) Differential regions for the H3K4me3 mark are most abundant in the five bins downstream of the TSS. B) Differential regions for the H3K27me3 mark are most abundant at the TSS and the first three bins downstream of the TSS.
