phenol-chloroform extraction 2-5 ng of cDNA, ChIP-precipitated DNA were used as starting material for the generation of single-end sequencing libraries as described by Illumina's ChIP Sequencing sample preparation protocol. DNA fragments of the following sizes were selected for the different experiments: 200–350 bp for ChIPseq and 150–700 bp for RNA-seq. For strand-specific RNA-sequencing, the uridines present in one cDNA strand were modified with uracil-N-glycosylase (New England Biolabs) unable to generate second strand. The barcode containing adaptor was used for tagging and PCR amplification. Completed libraries were quantified with the Agilent Bioanalyzer dsDNA 1000 assay kit and Agilent QPCR NGS library quantification kit. library construction protocol