RELACS: nuclei have been extracted, permeabilized and barcoded following RELACS protocol. Nuclei labeled with distinct barcodes have been pooled and lysed to complete chromatin preparation. Traditional ChIP-seq: after nuclei extraction chromatin has been fragmented by sonication. Immunoprecipitation has been performed using the antibody of interest. RELACS libraries: as described in the paper, using A-tailing strategy and ligation of adapters containing nuclear barcodes. After ChIP and DNA purification library preparation has been completed by PCR amplification using NEB workflow (NEBNext Ultra II DNA library preparation kit (E7645L, NEB)). Traditional ChIP-seq libraries: NEBNext Ultra II DNA library preparation kit (E7645L, NEB)