1. Abbott Laboratories (M.J.C., P.B.J., B.L., M.N., C.W.L., S.W.E., P.R.K., J.R.L., G.W.C.), Abbott Park, Illinois 60064
2. Mayo Clinic (R.T.), Rochester, Minnesota 55905
3. Ligand Pharmaceuticals, Inc. (C.M.T., J.H., M.E., J.R., J.N.M.), San Diego, California 92121