1. Department of Biochemistry,
Albert Einstein College of Medicine, Yeshiva University, 1300 Morris Park Avenue, Bronx, New York 10461, United States
2. Beijing National Laboratory
for Molecular Sciences, Departent of Chemical Biology, College of
Chemistry and Molecular Engineering, Synthetic and Functional Biomolecules
Center, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, P. R. China
3. State Key Laboratory of Chemical
Resource Engineering, University of Chemical Technology, P.O. Box 98, Beijing 100029, P. R. China