Beijing Institute of Genomics, Chinese Academy of Sciences, No, 7 Bei Tu Cheng West Road, Beijing 100029, PR China. ql2@sanger.ac.uk|Beijing Institute of Genomics, Chinese Academy of Sciences, No, 7 Bei Tu Cheng West Road, Beijing 100029, PR China. ql2@sanger.ac.uk|Beijing Institute of Genomics, Chinese Academy of Sciences, No, 7 Bei Tu Cheng West Road, Beijing 100029, PR China. ql2@sanger.ac.uk