library_construction_protocol: Cells were fixed with 1% formaldehyde in PBS for 10 minutes, and sonicated with diagenode Bioruptor Plus ChIP-seq libraries were prepared with NEBNext Ultra II DNA library prep kit. The libraries were amplified with 4-8 cycles on the thermocycler and size selection was done with Agencourt AMPure XP beads. The libraries were validated with Agilent D5000 DNA screen tape.