ChIPmentation combines ChIP with sequencing library preparation by Tn5 transposase (tagmentation). Both ATAC-seq and ChIPmentation can be combined usefully in the same experiment to assay open chromatin and protein binding, respectively.1 This combination of methods takes advantage of the flexibility and efficiency provided by using Tn5 transposase in library preparation. Tagmentation is performed directly on bead-bound, immunoprecipitated chromatin, followed by standard library preparation methods.