1. Cell Transplantation and Gene Therapy Institute; The Third Xiangya Hospital; Central South University; Changsha Hunan China
2. Engineering and Technology Research Center for Xenotransplantation of Human Province; Changsha Hunan China
3. Laboratory of Molecular Imaging and Nanomedicine (LOMIN); National Institute of Biomedical Imaging and Bioengineering (NIBIB); National Institutes of Health (NIH); Bethesda MD 20892 USA