Lysates were extracted from sonicated 1% formaldehyde-crosslinked nuclei and histone-DNA complexes were isolated with ERRalpha antibody. DNA was purified using QIAquick PCR Purification Kit. Libraries were prepared using the Illumina TruSeq ChIP Library Prep Kit Libraries were prepared at McGill University and Génome Québec Innovation Centre according to the Illumina TruSeq ChIP Library Prep Kit