1. Barbara Davis Center for Childhood Diabetes (L.Y., K.W.B., T.W., S.R.B., P.A.G., M.J.R., G.S.E.), Denver, Colorado 80262;
2. Stratton Veterans Affairs Medical Center (S.G., A.W.), Albany, New York 12208;
3. Clinical Immunology and Histocompatibility Laboratory (B.M.F.), University of Colorado, Denver, Colorado 80262;
4. Roche Molecular Systems (H.A.E.), Alameda, California 95401