Distributions of nucleosome positions around Sp1 binding sites.

<p>Distributions of the central positions of nucleosomes for the top 8 marks and 3 repressive marks around Sp1 binding sites on the genome. The x-axis shows genomic positions with respect to central position of Sp1 binding sites (from −1015bp to +1015bp). The positions of nucleosomes are defined as the positions from −15 bp to 15 bp with respect to the center of the nucleosome. Active marks are highly enriched around binding sites and show a bimodal distribution around these sites. A nucleosome free region with respect to central position of binding sites is also observable in all top marks.