1. Department of Biochemistry and Biophysics, and Program in Molecular and Cellular Biophysics, University of North Carolina, Chapel Hill, NC 27599-7260, U.S.A.
2. Division of Hematology, Departments of Medicine and Pathology, Duke University Medical Center, Durham, NC 27710, U.S.A.
3. Department of Molecular Pathology, Duke University Health System, Durham, NC 2771, U.S.A.