1. CAS Key Laboratory
for Biomedical
Effects of Nanomaterials and Nanosafety, Institute of High Energy
Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
2. National Center for Nanoscience and Technology of China, Beijing 100190,
China
3. Computational Biology
Center, IBM Thomas J. Watson Research Center, Yorktown Heights,
New York 10598, United States
4. Department of Chemistry, Columbia University, New York, New York 10027, United
States