1. Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
2. Division of Anatomy, School of Medical Sciences, University of Phayao, Phayao 56000, Thailand
3. Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm 10691, Sweden
4. Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
5. Laboratory of Glycochemistry and Agroresources UR 7378, Picardie Institute of Chemistry FR 3085, University of Picardie Jules Verne, 80000 Amiens, France