1. Department of Cytokine Biology, Forsyth Institute, and Department of Oral and Developmental Biology, Harvard School of Dental Medicine, Boston, Massachusetts.
2. Department of Oral and Maxillofacial Surgery, Massachusetts General Hospital, Boston, Massachusetts.
3. Tufts University School of Dental Medicine, Tufts University, Boston, Massachusetts.
4. Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts.