1. From the Department of Immunology, Genetics and Pathology (M.H., I.W., O.S., L.C.W.), Rudbeck Laboratory, and Department of Medical Biochemistry and Microbiology (S.L.J., Z.K., I.E., J.H., K.H., D.S., L.K., J.K.), Science for Life Laboratory, Uppsala University, Uppsala, Sweden; Department of Cellular and Molecular Medicine (J.R.B., J.D.E.), University of California, San Diego, La Jolla, CA; and the Department of Medical Biochemistry and Biophysics (L.J.), Karolinska Institute, Stockholm, Sweden.