Live cells were crosslinked with 1.8% formaldehyde for 10 min at 25C. Soluble chromatin was prepared and immunoprecipitation performed as described in Kahn et al. Nucleic Acids Res. 2016. 44:10132-10149 2ng of immunoprecipitated DNA were processed using NEBNext Ultra II DNA Library preparation Kit for Illumina (cat# E76455) and index oligonucleotides from NEBNext Multiplex Oligos for Illumina (cat# E7335).