1. Department of Cariology, Restorative Sciences and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan.
2. Department of Endodontology, School of Stomatology, Nanjing University Medical Center, Nanjing, China.
3. Transgenic Animal Model Core, University of Michigan Medical School, Ann Arbor, Michigan.
4. Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, Michigan.
5. Department of Surgery, University of Michigan Medical School, Ann Arbor, Michigan.