1. From BHF Cardiovascular Sciences Unit (H.C., M.Z., J.B., S.C., K.v.d.H., L.A.L., J.C.M., D.O.H., P.C.E.), National Heart and Lung Institute, Imperial College London, London, UK; UCB Celltech (J.D., A.P.), Slough, UK; and Department of Bioengineering (R.K.) and Kennedy Institute of Rheumatology Division (A.R.C.), Imperial College London, London, UK. A. Platt is currently affiliated with Roche Products Limited, Welwyn Garden City, UK.