1. Interdisciplinary Program in Immunology and Department of Otolaryngology, Department of Pathology, and Department of Microbiology, University of Iowa, Iowa City, IA 52242
2. Lipid Metabolism Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
3. Department of Chemistry and Department of Biochemistry, University of Washington, Seattle, WA 98195
4. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Saitama 332-0012, Japan