1. Salivary Gland Disease Center and the Molecular Laboratory for Gene Therapy and Tooth Regeneration, Capital Medical University School of Stomatology, Beijing, People's Republic of China.
2. Department of Physiology, Capital Medical University, Key Laboratory for Neurodegenerative Disorders of the Ministry of Education, Beijing, People's Republic of China.
3. Beijing Institute for Neuroscience, Capital Medical University, Beijing Center of Neural Regeneration and Repair, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, Beijing, People's Republic of China.
4. The Center for Craniofacial Molecular Biology, University of Southern California School of Dentistry, Los Angeles, California.
5. Department of Biochemistry and Molecular Biology, Capital Medical University School of Basic Medical Sciences, Beijing, People's Republic of China.