1. Department of Cytology and Histology, Faculty of Veterinary Medicine, Minufiya University, Sadat City Branch, Sadat City, Minufiya, Egypt.
2. Department of Biotechnology, Faculty of Science, Taif University, Al-Haweiah, Taif, Saudi Arabia.
3. Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Minufiya University, Sadat City Branch, Sadat City, Minufiya, Egypt.
4. Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.