Departments of Pathology and Genetics and Development, Columbia University, New York, NY 10032; Servizio di Ematologia, Istituto di Scienze Mediche, Universita’ di Milano, Ospedale Maggiore Istituto di Ricoveroe Cura a Carattere Scientifico, Milan 20122, Italy; Department of Human Genetics, Memorial Sloan-Kettering Cancer Center, New York, NY 10021; and Institute of Genetics, University of Cologne, Cologne 50931, Germany (At 1998-09-29)
