Performed with Illumina protocol. 10Ng of inmunoprecipitated DNA was en-repaired, and Illumina double stranded adapters for single read sequencing were ligated to the DNA. After purification of the sample with a MinElute spin column, we size the selected libraries on a 2% agarose gel and fragments corresponding to an insert size range of around 130bp were recovered. The libraries were finally amplified with an 18-cycle PCR reaction, and library quality was confirmed on the Agilent 2100 Bioanalyzer. The samples were loaded at concentrations of 8-11 pm onto Illumina single read flowcells and sequenced on the Illumina Genome Analyzer Iix using a 40 cycles recipe.