Department of Veterinary Physiology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido

Institute for Parasitology and Tropical Veterinary Medicine, Free University of Berlin, Berlin, Federal Republic of Germany

Max-Planck Institute for Biochemistry, Martinsried by Munich, Federal Republic of Germany

Research Center for Protozoan Molecular Immunology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

Department of Veterinary Physiology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido

Obihiro Meat Inspection Office, Obihiro, Japan

Research Center for Protozoan Molecular Immunology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan