1. Department of Food Hygiene and Kyonan-cho, Musashino-shi, 180, Tokyo
2. Department of Veterinary Pharmacology, Nippon Veterinary and Animal Science University, 1–7–1 Kyonan-cho, Musashino-shi, 180, Tokyo
3. Central Research Institute, Taiyo Fishery Co., Ltd, 16–2 Wadai, Tsukuba, 300–42, Ibaraki
4. Ensuiko Sugar Refining Co., Ltd, 13–46 Daikoku-cho, Tsurumi-ku, Yokohama, 230, Japan