1. Section of Molecular Parasitology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea.
2. Department of Parasitology, Faculty of Medicine, Chung-Ang University, Seoul 156-756, Korea.
3. Department of Parasitology, College of Medicine, Cheju National University, Cheju 690-756, Korea.