1. Histology Unit, School of Medicine Ahfad University for Women Omdurman Sudan
2. Department of Anatomy, Faculty of Veterinary Medicine University of Khartoum Shambat Sudan
3. Molecular Pathology Unit, School of Biology Chemistry and Health Science Manchester Metropolitan University Manchester UK
4. Department of Reproduction and Obstetrics, Faculty of Veterinary Medicine University of Khartoum Khartoum Sudan