1. Department of Biochemistry, Cellular and Molecular Biology, School of Medicine, Georgetown University, Washington, District of Columbia.
2. TUBITAK Marmara Research Center, Institute of Gene Engineering and Biotechnology, Molecular Oncology Laboratory, Gebze, Kocaeli, Turkey.
3. Section of Ultrastructural Biology, NEI/NIH, Bethesda, Maryland.
4. Department of Radiation Oncology, School of Medicine, Georgetown University, Washington, District of Columbia.