1. Chromatin Lab, National Institute of Biological Sciences 7 Science Park Road, Zhong Guan Cun Life Science Park Beijing 102206 China
2. Institute of Biophysics, Chinese Academy of Sciences Beijing 100101 China
3. Graduate Program, Peking Union Medical College and Chinese Academy of Medical Sciences Beijing 100730 China
4. College of Life Sciences, Wuhan University Wuhan 430072 China