1. Histology and Cell Biology Department, Sphinx university, Assiut, Egypt
2. Histology and Cell Biology Department, Faculty of Medicine, Assuit University, Assiut, Egypt
3. Histology and Cell Biology Department, Faculty of Medicine, South Valley University, Qena, Egypt
4. Department of Biochemistry, Sphinx University, Assiut, Egypt
5. Department of Medical Biochemistry, Faculty of Medicine, Assiut University, Assiut, Egypt
6. Department of Restorative Dentistry and Basic Medical Sciences, Faculty of Dentistry, University of Petra, Amman, Jordan