1. Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
2. Student Research Committee, Sabzevar University of Medical Sciences, Sabzevar, Iran
3. Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
4. Dept. of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran