1. Department of Ophthalmology and Visual Sciences, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan
2. Host Defense Laboratory, Mitsubishi Chemical Medience Corporation, Tokyo 174-8535, Japan
3. Department of Microbiology, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
4. AIDS Vaccine Development Association, Tokyo 169-0075, Japan