library_construction_protocol: ChIP-seq was performed  with antibodies for H3K27me3 (Abcam, ab6002), H3K4me3 (millipore, 07-473), H3K27ac (abclonal, A7253) and H3K36me3 (Abcam, ab9050). Libraries were constructed using Kit (TransGen Biotech, KP201-02), sequenced by Annoroad Gene Technology (Beijing, China).