1. University of Oxford, Laboratory of Molecular Biophysics, Department of Biochemistry, Rex Richards Building, South Parks Road, Oxford OX1 3QU, U.K.
2. Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, U.K.
3. British Biotech, Watlington Road, Cowley, Oxford OX4 5LY, U.K.
4. Oxford Bioresearch Laboratory, Magdalen Centre, Oxford Science Park, Oxford OX4 4GA, U.K.
5. University of Oxford, Oxford Centre for Molecular Sciences, Fibrinolysis Research Unit, The Old Observatory, South Parks Road, Oxford OX1 3RH, U.K.