1. Stem Cell and Cancer Center, First Affiliated Hospital, Jilin University, Changchun 130061, People’s Republic of China
2. Department of Ophthalmology and Department of Biochemistry and Molecular Biology, Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, People’s Republic of China
3. Veterans Affairs Palo Alto Health Care System, Stanford University Medical School, Palo Alto, CA 94304
4. Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY 14263