library_construction_protocol: Cells were lysed in RSB (10mM Tris-HCl (pH 7.4), 10mM NaCl, 3mM MgCl2, 0.1% NP-40) supplemented with 0.1% Tween-20, and 0.01% digitonin for 3 minutes on ice and then washed with RSB supplemeneted with 0.1% Tween-20 Nuclei were then transposed for 30min at 37C with 1000RPM mixing in 50uL transposition mix (25uL 2X TD buffer, 2.5uL Tn5 transposase (100nM final), 16uL PBS, 0.5uL 1% digitonin, 0.5uL 10% Tween-20, 5uL H2O) DNA was purified with Qiagen MinElute PCR cleanup kit. Libraries were amplified after determining the optimal number of cycles by qPCR. Post amplification libraries were size selected using Agencourt AMPure XP beads from Beckman Coulter.