library_construction_protocol: Lysates were obtained from sonicated nuclei crosslinked with either 1% formaldehyde and 2 mM disuccinimidyl glutarate (double cross-linking) for SMARCA4, or 1% formaldehyde alone (single cross-linking) for all other targets. Protein-DNA complexes were isolated by immunoprecipitation. All libraries were barcoded and prepared for sequencing using standard Illumina protocols.