1. From the Department of Immunology (L.K.C., D.T.V., N.J.H.), The Scripps Research Institute, La Jolla, Calif; The Heart Research Institute, Ltd (K.-A.R.), Camperdown, Sydney, New South Wales, Australia; the Department of Medicine (K.-A.R.), University of Sydney, New South Wales, Australia; and the Department of Medicine (K.-A.R.), University of Melbourne, Victoria, Australia.