Formaldehyde cross-linking and chromatin immunoprecipiation was performed as described in Hwang-Verslues et al., 2008 (Mol Endo 22:78-90) and Li AG et al., 2007 (Mol. Cell 28:408-421) with some modification. Illumina-compatible NEXTflex ChIPseq Kit (Bioo Scientific) was used to generate libraries from purified ChIP DNA for sequencing in the Illumina's HiSeq2000. Illumina HiSeq2000 was used to sequence the libraries (50bp, single-end)