1. From the Department of Genetics and Pathology (P.U.M., P.C., L.J., A.D., L.C.-W.), Rudbeck Laboratory, Uppsala University, Uppsala, Sweden; the Unit of General Pathology and Immunology (R.R., P.D.E.), Department of Biomedical Sciences and Biotechnology, University of Brescia, Brescia, Italy; and the Institute of Biotechnology (J.P.), University of Helsinki, Helsinki, Finland