1. Department of Neurobiology, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China.
2. People's Liberation Army Clinical Center for Spinal Cord Injury, Kunming General Hospital of People's Liberation Army, Kunming, P.R. China.
3. Jinghong Breeding Station, Yunnan Laboratory Primates Inc., Yunnan, P.R. China.
4. Department of Anatomy, University of Hong Kong Faculty of Medicine, Hong Kong, P.R. China.
5. Institute of Neurosciences, The Fourth Military Medical University, Xi'an, P.R. China.
6. Spinal Cord and Brain Injury Research Group, Stark Neurosciences Research Institute and Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, Indiana.