Lysates were clarified from sonicated nuclei and histone-DNA complexes were isolated with antibody. 9 ng of ChIP DNA as quantitated by fluorometry was used. Electrophoretic fraction of 150 bp was processed through subsequent enzymatic treatments of end-repair, dA-tailing, and ligation to adapters as in Illumina's "TruSeq DNA Sample Preparation Guide" (part # 15005180 Rev. C). Adapter-ligated library was completed by limited-cycle PCR with Illumina PE primers (12 cycles). The resulting purified DNA library was applied to an Illumina flow cell for cluster generation (TruSeq cluster generation kit v5) and sequenced on the Genome Analyzer IIx with SBS TruSeq v5 reagents by following manufacturer's protocols.