1. a Pharmacognosy Department, Faculty of Pharmacy , Helwan University , Helwan, Egypt
2. b Chemistry of Tannins and Leather Technology Department , National Research Centre , El-Behoose St., El-Dokki, Cairo, Egypt
3. c Pharmacognosy Department, Faculty of Pharmacy , Al-Azhar University , Cairo, Egypt
4. d Molecular Cell and Developmental Biology , The University of Texas at Austin , Austin, TX 78712, USA