Affiliation: | (1) Istituto di Genetica medica, Via Santena 19, 10126 Torino, Italy;(2) CNR Centro Immunogenetica ed Istocompatibilitá, Via Santena 19, 10126 Torino, Italy;(3) State University Department of Human Genetics, Wassenasserweg 72, Leiden, The Netherlands;(4) European Molecular Biology Laboratory, Meyerofsstrasse 1, D-6900 Heidelberg, Federal Republic of Germany |