Lysates were clarified from sonicated nuclei and protein-DNA complexes were isolated with antibody. Libraries were prepared according to Illumina's instructions accompanying the TruSeq DNA sample prep kit (Cat no. FC-121-2001). Briefly, DNA was end-repaired using a combination of T4 DNA polymerase, Klenow polymerase and T4 polynucleotide kinase. The blunt, phosphorylated ends were treated with Klenow fragment (32 to 52 exo minus) and dATP to yield a protruding 3- 'A' base for ligation of Illumina's adapters which have a single 'T' base overhang at the 3' end. After adapter ligation DNA was PCR amplified with Illumina primers for 15-18 cycles and library fragments of 200-400 bp (insert plus adaptor and PCR primer sequences) were band isolated from an agarose gel. The purified DNA was captured on an Illumina flow cell for cluster generation. Libraries were sequenced on the Genome Analyzer following the manufacturer's protocols.