1. Department of Biochemistry, School of Medicine, and Medical Research Institute, Chungbuk National University, Cheongju 361-763,1
2. Department of Biochemistry, School of Dentistry, and Medical Research Institute, Kyungpook National University, Taegu, 2 Korea;
3. Department of Medicine III, Osaka University Medical School, Osaka 565, Japan 3 ; and
4. Genetics Institute, Inc., Cambridge, Massachusetts4