The ChIP assay was carried out as per the manufacturer's protocol (Millipore #17-371). The ChIP DNA samples were prepared and indexed for Ilumina sequencing using the TruSeq DNA sample Prep Kit (Ilumina) as per manufacturer's instructions. The indexed libraries were then prepared for single-end 75-85 bp sequencing on an Illumina NextSeq 500 using the 150 cycle kit v2 chemistry (Ilumina) as per the manufacturer's instructions.