1. CAS Engineering Laboratory for NanozymeInstitute of BiophysicsChinese Academy of Sciences Beijing 100101 China
2. Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of Technology Beijing 100081 China
3. College of Life SciencesUniversity of Chinese Academy of Sciences Beijing 100049 China
4. Departmental of Medical MicrobiologySchool of Basic Medical ScienceShandong University Jinan 250012 China
5. State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua University Beijing 100084 China
6. Gordon Center for Medical ImagingDepartment of RadiologyMassachusetts General Hospital and Harvard Medical School Boston MA 02114 USA