Chromatin immunoprecipitation was performed using the protocol described in BMC Genomics. 2014 Dec 22;15:1157. doi: 10.1186/1471-2164-15-1157. Standard Illumina library was constructed as described in BMC Genomics. 2014 Dec 22;15:1157. doi: 10.1186/1471-2164-15-1157. Standard Illumina library for genomic DNA