1. Departments of Genetics and
2. Department of Biomedical Sciences, College of Medicine, Florida State University, Tallahassee, Florida 32306; and
3. Department of Genetics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
4. Biochemistry,
5. Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305;