1. Department of Histology and Cell Biology, Faculty of Medicine Fayoum University Fayoum Egypt
2. Medical Biochemistry and Molecular Biology Department, Faculty of Medicine Cairo University Cairo Egypt
3. Galala University, Faculty of Medicine, Suez Governorate Egypt
4. Department of Anatomy, Faculty of Medicine Umm Al‐Qura University Saudi Arabia
5. Department of Histology and Cytology, Faculty of Medicine Benha University Benha Egypt