Affiliation: | aDepartment of Anatomy, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160, Japan bDepartment of Tropical Medicine and Parasitology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160, Japan cLaboratory of Biotechnology, Cosmo Research Institute, Saitama 340-01, Japan |