library_construction_protocol: Cells were fixed with formaldehyde for 10 minutes using the active motif Low cell ChIP-seq (cat # 53084). After quenching and cell lysis, chromatin was sonicated using a Q800R3 Sonicator (Qsonica) with recirculating chiller. ChIP-seq libraries were prepared using the active motif Low cell ChIP-seq (cat # 53084) that include the Next Gen DNA library kit and Next Gen Indexing kit. 10 ng of DNA was used as starting material for input and ip samples. Libraries were amplified using 14 cycles on the thermocycler. Post amplification libraries were size selected at 250-450bp in length using SPRIselect  beads from Beckman Coulter. Libraries were validated using the Agilent High Sensitivity DNA Kit.