1. Laboratory of Stem Cell and Tissue Engineering, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, No. 1, Keyuan Fourth Road, Chengdu, Sichuan 610041, P. R. China
2. West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, No. 17, Third Section, People’s South Road, Chengdu, Sichuan 610041, P. R. China
3. Institute of Genetic Medicine, School of Life Science, Sichuan University, No. 17, Third Section, People’s South Road, Chengdu, Sichuan 610041, P. R. China