library_construction_protocol: Cells were fixed with 4% formaldehyde. Chromatin samples were prepared using a SimpleChIP Enzymatic Chromatin IP Kit (Cell Signaling Technology, 9003). DNA libraries for ChIP-seq were prepared using NEBNext® Single Cell/Low Input RNA Library Prep Kit for Illumina® (NEB, E6420) and NEBNext Multiplex Oligos for Illumina (96 Unique Dual Index Primer Pairs Set 2) (NEB, E6446S).