1. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
2. Department of Chemistry, University of California, Davis, California 95616, United States
3. Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States