Chromatin immunoprecipitation was performed as previously described (Beagan et al. 2016 (link)). Sequencing libraries were prepared with the NEBNext Ultra Library Prep Kit following the manufacturer's protocol for ChIP-seq library preparation, with amplification over 18 PCR cycles using NEBNext Multiplex Oligos for Illumina. The library was confirmed to contain DNA fragments ranging roughly from 250 to 1200 bp by running a High-Sensitivity DNA assay on an Agilent Bioanalyzer and sequenced with 75 cycles per paired-end on the Illumina NextSeq500.