1. Department of Chemistry and Institute for Biophysical Dynamics, The University of Chicago, Illinois 60637, USA;
2. Howard Hughes Medical Institute, USA;
3. Department of Ecology and Evolution, The University of Chicago, Illinois 60637, USA;
4.北京大学化学与分子工程学院化学生物学系，合成与功能生物分子中心，北京 100871
