Lysates were clarified from sonicated nuclei and histone-DNA complexes were isolated with antibody. For ChIP-seq libraries, 10 ng of input chromatin DNA or ChIP DNA were processed using the ChIP-seq sample prep kit (Illumina). Gel-purified ChIP-seq library DNA was further purified by phenol-chloroform extraction and ethanol precipitation, and processed for cluster generation, 15-cycle sequencing, and sequence analysis using Illumina Hiseq.