1. School of Biomedical Engineering
2. Sun Yat-sen University
3. Guangzhou
4. P. R. China
5. Materials Science and Engineering Program
6. University of California San Diego
7. La Jolla
8. USA
9. Laboratory for Stem Cells and Tissue Engineering
10. Ministry of Education
11. Guangzhou 510080
12. China
13. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization
14. Chengdu Institute of Biology
15. Chinese Academy of Sciences
16. Chengdu