1. Choju Medical Insutitute; Fukushimura Hospital; Toyohashi Aichi 441 Japan
2. Department of Molecular Biology; Nagoya City University School of Medicine; Nagoya Aichi 467 Japan
3. Department of Biochemistry; Daiichi College of Pharmaceutical Sciences; Fukuoka Fukuoka 815 Japan
4. Department of Immunology; The Scripps Research Institute; La Jolla California U.S.A.
5. Department of Molecular Immunology, Institute of Development, Aging and Cancer; Tohoku University; Sendai Miyagi 980 Japan