1. Division of Silk-Producing Insect Biotechnology, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Ibaraki 305-8634, Japan
2. Division of Advanced Feeding Technology Research, Institute of Livestock and Grassland Science, NARO, Ibaraki 305-0901, Japan
3. Division of Biomaterial Sciences, Institute of Agrobiological Sciences, NARO, Ibaraki 305-8634, Japan
4. New Technology Promotion Section, Strategic Planning Headquarters, NARO, Ibaraki 305-8642, Japan