Khalil Mohamed1 ; AAziz A. Ahmed2; Intisar E. Elrayah 3
1Commission for Biotechnology & Genetic Engineering, Department of Medical Biotechnology, Khartoum, P.O. Box, 2404, Sudan.
2Faculty of Science, University of Khartoum-Sudan.
3Tropical Medicine Research Institute TMRI, Khartoum, Sudan.
