1. Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, PRChina
2. Faculty of Basic Medical Sciences, Guilin Medical University, Guilin 541004, PRChina
3. College of Laboratory Medical Science, Hebei North University, Zhangjiakou 075000, PRChina
4. Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, PRChina
5. Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA