Institution: | From the ‡Unit of Molecular Biology and Genetic Engineering, University of Liège, GIGA-R, B34, Avenue de l''Hôpital 1, B-4000 Liège, Belgium, ;the §Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, and ;the ¶Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh EH4 2XV, Scotland, United Kingdom |