1. From Department of Surgical Research (S.K.B., R.F., C.J.G., R.M.), Northwick Park Institute for Medical Research, Harrow, Middlesex, United Kingdom; Department of Haematology (J.H.), St Thomas’ Hospital, London, United Kingdom; Department of Haematology (S.A.), Central Middlesex Hospital, Brent, Middlesex, United Kingdom; Department of Drug Discovery and Development (R.F., R.M.), Italian Institute of Technology, Genova, Italy.