1. From the Department of Cardiology (M.T., U.I., K.S.), Division of Hemopoiesis (S. Kitagawa, Y.F.), and Departments of Clinical Immunology (J.M., S. Kano) and Medical Biology and Parasitology (T.K.), Jichi Medical School, Tochigi, and the Department of Clinical and Laboratory Medicine (Y.T.), Tohoku University School of Medicine, Miyagi, Japan.