1. Department of Parasitology, Gunma University Graduate School of Medicine, 3-39-22 Showa-machi, Maebashi, Gunma 371-8511
2. Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033
3. Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 2-20-5 Akebono-cho, Tachikawa, Tokyo 190-0012, Japan
4. Departments of Internal Medicine and Microbiology
5. Department of Medicine, Microbiology, and Pathology, University of Virginia Health System, Charlottesville, Virginia 22908-1340