Cell lysis and nuclei preparation was performed using the standard Zymo-Seq ATAC Library Kit protocol, with one deviation: 20.000 live cells were used per replicate instead of 50.000 ATAC libraries were prepared using the Zymo-Seq ATAC Library Kit. The standard protocol of the kit was followed, with the following exception: Tagmentation reaction lasted 1 hour instead of 30 minutes