1. Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
2. Augusta Preparatory Day School, 285 Flowing Wells Rd, Martinez, GA 30907, USA
3. Dental College of Georgia, Augusta University, Augusta, GA 30912, USA
4. Division of Signal Transduction, Beth Israel Deaconess Medical Center and Department of Medicine, Harvard Medical School, Boston, MA 02215, USA