library_construction_protocol: Samples (100,000 cells)  were processed using the FAST-ATAC protocol (Corces et al., 2016). DNA quality and quantity was determined using High Sensitivity D5000 ScreenTape (Agilent Technologies). Libraries were sequenced to a read depth of about 40 million reads per sample on an Illumina NovaSeq X Plus with a 150 bp read length.