1. Key Laboratory for Stem Cells and Tissue Engineering; Sun Yat-sen University; Ministry of Education; Guangzhou Guangdong 510080 China
2. PCFM Lab; School of Chemistry; Sun Yat-sen University; Guangzhou Guangdong 510127 China
3. Guangdong Provincial Key Laboratory of Brain Function and Disease; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou Guangdong 510080 China
4. Department of Orthopedic and Microsurgery; The First Affiliated Hospital of SunYat-sen University; No. 58, Zhongshan 2nd Road Guangzhou 510080 China
5. Department of Electron Microscope; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou Guangdong 510080 China
6. Translational Tissue Engineering Center; and Department of Biomedical Engineering; Johns Hopkins University School of Medicine; Baltimore MD 21287 USA
7. Institute for NanoBioTechnology; and Department of Materials Science and Engineering; Johns Hopkins University; Baltimore MD 21218 USA
8. Department of Anatomy; Yong Loo Lin School of Medicine; National University of Singapore; Singapore 117597 Singapore
9. Department of Histology and Embryology; Zhongshan School of Medicine; Sun Yat-sen University; Guangzhou Guangdong 510080 China
10. Joint Innovation Center of Neuroregeneration; Nantong University; Nantong Jiangsu 226001 China
11. Institute of Spinal Cord Injury; Sun Yat-sen University; Guangzhou Guangdong 510120 China