ChIP DNA was extracted as described in Hollenhorst et al., Genes and Dev. 2011 Sequencing libraries were generated using a modified Illumina Truseq sample preparation protocol. ChIP DNA's were sheared to ~150 nucleotides using a Diagenode BioRuptor and the size was confirmed by DNA gel electrophoresis. DNA end repair of the cDNA was performed using Klenow DNA polymerase (New England BioLabs), T4 DNA polymerase (New England BioLabs), and T4 DNA ligase (New England BioLabs) before the sample was subjected to QIAquick PCR purification (Qiagen). Adapters were ligated to DNA fragments using the T4 DNA ligase (New England BioLabs). The product was run on a 2% agarose gel and size selected between 200 and 300 nucleotides to then be purified by a Gel Extraction kit (Qiagen). Universal and indexing adapters were taken from the TruSeq sample preparation kit (Illumina).