Chromatin immunoprecipitation sequencing was performed with 1 × 107 cells as previously described (Liang et al. 2015 (link)). The sheared chromatin was immunoprecipitated with 10 µg individual antibodies and 15 µL preblocked Protein A/G beads (Smart-Lifesciences). Library was prepared using the NEBNext ultra II DNA library prep kit for Illumina. For ChIP-Rx experiments, sonicated human chromatin was spiked-in with 10%–30% mouse chromatin to quantitatively normalize across experiments. Experimental details and sequencing data analysis are included in Supplemental Methods.