Mouse hair follicle stem cells were purified from Sox9-CreER;NFIBfl/fl;NFIXfl/fl and WT littermate mice at P70 2nd telogen and immediately subjected to ATAC-seq library generation. FACS-sorted cells were pelleted and incubated with cold lysis buffer (10 mM Tris-HCl, pH 7.4, 10 mM NaCl, 3 mM MgCl2, 0.1% IGEPAL CA-630). After removing lysis buffer by centrifugation, samples were subjected to a transposition reaction at 37°C for 30 min with 10μL transposase enzyme (Illumina Nextera DNA Preparation Kit). Transposed DNA was purified using QIAGEN MiniElute PCR purification kit and PCR amplified with 10-15 cycles. Library concentration and quality were assayed by D1000 Tape Station (Agilent) prior to sequencing. The samples were sequenced on Illumina HiSeq 2000 using a 50bp paired-end-reads setting.