* Corresponding authors

^a Biodynamic Optical Imaging Center (BIOPIC), College of Engineering, Peking University, Beijing 100871, China
E-mail: yanyi@pku.edu.cn

^b Med-X Research Institutes, Shanghai Jiaotong University, Shanghai 200030, China

^c Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

^d Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda, Maryland 20892, USA
E-mail: shawn.chen@nih.gov