Lysates were clarified from sonicated nuclei and ER-bound DNA complexes were isolated with antibody (Santa Cruz, sc-543). ChIP was performed according to our in-house protocols. A minimum of 10ng DNA was sent to McGill University sequencing core. The library was prepared using TruSeq ChIP Library Preperation kit (Illumina) and was sequenced on Hiseq 2500 (Illumina). Over 16M single end 50bp reads were allocated for each sample.