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The nucleosome abundance as a function of GC content among nucleosome-protected sequences. We calculate GC content in 2,000-nt window with a step length of 100 nt. The dashed line indicates the genome average GC content (35%). The distribution of nucleosome-protected sequences shifts toward high GC content. The data points distributed above the curves may represent repetitive reads that are mapped to unique sites of the reference genome.
