Abstract
1 Immunology Division, Jichi Medical School, Tochigi-Ken 329-04,
2 Department of Hygiene, University of Hiroshima, Hiroshima-Ken 734,
3 First Department of Internal Medicine, Yamanashi Medical College, Yamanashi-Ken 409-38,
4 Department of Internal Medicine, Iwaki Kyoritsu General Hospital, Fukushima-Ken 973,
5 Japanese Red Cross Blood Center, Saitama-Ken 362,
6 Department of Immunology, The Kitasato Institute, Tokyo 108
and7 Mita Institute, Tokyo 108, Japan