title: GSM7849478: Panc-Smad4OFF_m3; Mus musculus; ATAC-seq
library_construction_protocol: A total of 60,000 mKate2+cells were isolated by FACS, washed once with 50 μl cold PBS and resuspended in 50 μl cold lysis buffer. Cells were then centrifuged immediately for 10 min at 500gat 4°C, and the pellet of nuclei was subjected to transposition with Nextera Tn5 transposase (Illumina #FC-121–1030) for 30 min at 37°C, according to the manufacturer's instructions. DNA was eluted using a DNA Clean & Concentrator Kit in 21 μl elution buffer (Zymo Research #D4013). ATAC-seq libraries were prepared using the NEBNext High-Fidelity 2X PCR Master Mix (NEB M0541) as previously described (PMID: 25559105). Purified libraries were assessed using a Bioanalyzer High-Sensitivity DNA Analysis kit (Agilent). Approximately 50 million paired-end 150-bp reads (25 million each side) were sequenced per replicate on a HiSeq instrument (Illumina).