1. State Key Laboratory of Medicinal Chemical Biology, College of Life Sciences, Nankai University, Tianjin 300071, People's Republic of China
2. Department of Immunobiology, School of Medicine, Yale University, New Haven, CT 06520, USA
3. The First Affiliated Hospital, Biomedical Translational Research Institute, Guangdong Province Key Laboratory of Molecular Immunology and Antibody Engineering, Jinan University, Guangzhou 510632, People's Republic of China
4. Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA