Nucleosome Positioning Figure 1. The four most prominent and clear dinucleotide periodicities amongst all thirteen genomes and dinucleotides analysed. The counts in the histograms are smoothened by averaging over 3 bases. For each genome the total counts (Y axis) summed over all chromosomes entering the study are plotted as function of the distances (X axis) in the interval 1–150 bases. doi:10.1371/journal.pone.0007654.g001 PLoS ONE | www.plosone.org 2 November 2009 | Volume 4 | Issue 11 | e7654