1. O. Genbacev and Y. Zhou, Department of Stomatology, University of California, San Francisco, CA 94143–0512, USA.
2. J. W. Ludlow, Department of Biochemistry and Biophysics, University of Rochester, Cancer Center, Rochester, NY 14642, USA.
3. S. J. Fisher, Departments of Stomatology; Obstetrics, Gynecology and Reproductive Sciences; Pharmaceutical Chemistry; and Anatomy, University of California, San Francisco, CA 94143–0512, USA.