1. Beijing National Laboratory for Molecular SciencesKey Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
2. College of ChemistryUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
3. State Key Laboratory of Membrane BiologyInstitute of ZoologyChinese Academy of Sciences Beijing 100101 P. R. China
4. Key Laboratory of Colloid and Interface ScienceInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
5. Institute for Stem Cell and RegenerationChinese Academy of Sciences Beijing 100101 P. R. China
6. University of Chinese Academy of Sciences Beijing 100049 P. R. China