1. Laboratory of Regulation in Metabolism and Behavior, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Japan
2. Present address : Laboratory of Nutritional Science for Animals, Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Japan
3. Microbial Genetic Division, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Japan
4. Asahi Kasei Chemicals Corporation, Japan