1. Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
2. Laboratory of Structural Immunology, CAS Key Laboratory of Innate Immunity and Chronic Diseases, CAS Center for Excellence in Molecular Cell Science, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, P. R. China