20 million cells per ChIP were crosslinked in 1% formaldehyde for 10 minutes at room temperature. Crosslinking was stopped with 125 mM Glycine and nuclei were extracted. Chromatin was sonicated using an Epishear Probe Sonicator (Active Motif) for 4 minutes at 40% power. c-MYC (D3N8F) antibody (Cell Signaling Technology) was used for immunoprecipitation and an input sample for each cell line served as the control. Libraries were constructed using a standard Illumina library construction protocol.