1. From the Cell Adhesion and Disease/Tumour Biology Laboratory (S.D.R., L.E.R., K.M.H.-D.), Cancer Research UK Clinical Centre, Queen Mary’s School of Medicine & Dentistry at Barts & The London, John Vane Science Centre, Charterhouse Square, London; Novartis Institute for Biomedical Research (L.W.), Angiogenesis Programme, Basel, Switzerland; and ImClone Systems Inc (D.J.H.), New York, NY.