1. Department of Bioregulation, Nippon Medical School, Kawasaki 211-8533, Japan
2. Department of Animal Sciences, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
3. Department of Agricultural Chemistry, School of Agriculture, Meiji University, Kawasaki 214-8571, Japan
4. Corporate Sponsored Research Program “Food for Life,” Organization for Interdisciplinary Research Projects, The University of Tokyo, Tokyo 113-8657, Japan