Lysates were clarified from sonicated nuclei and histone-DNA complexes were isolated with antibodies; anti-HA mouse monoclonal antibody, Nacalai cat# 06340-54; anti-H3K27ac mouse monoclonal antibody, Wako MABI0309. Libraries were prepared according to the manual of Illumina's Trueseq ChIP sample prep kit set A (Part# IP-202-1012).