1. Molecular Laboratory for Gene Therapy and Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, People's Republic of China.
2. The Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry, University of Southern California Los Angeles, Los Angeles, California.
3. Department of Biochemistry and Molecular Biology, Capital Medical University School of Basic Medical Sciences, Beijing, China.