1. State Key Laboratory of Membrane Biology and the State Key Laboratory of Stem Cell and Reproductive Biology Institute of Zoology, Chinese Academy of Sciences Beijing 100101 P. R. China
2. Savaid Medical School University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110169 P. R. China
4. Center for Excellence in Molecular Cell Science University of Chinese Academy of Sciences Shanghai 200031 P. R. China
5. Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
6. Department of Life Sciences and Medicine, University of Science and Technology of China Hefei 230026 P. R. China
7. Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101 P. R. China