1. Department of Comparative Pathobiology Purdue University West Lafayette Indiana 47907
2. Purdue University Center for Cancer Research West Lafayette Indiana 47907
3. Commission for Biotechnology and Genetic Engineering National Center for Research Khartoum Sudan
4. Department of Molecular Biology Institute of Endemic Diseases University of Khartoum Khartoum Sudan
5. National Cancer Institute University of Gezira Wadmadani Sudan
6. Radiation and Isotopes Center Khartoum (RICK) Khartoum Sudan