Covalent assembly of nanoparticles as a peptidase - degradable platform for 1 molecular MRI

9 Cancer Research UK & Medical Research Council Oxford Institute for Radiation Oncology, 10 Department of Oncology, University of Oxford, Oxford, OX3 7DQ,UK 11 Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, 12 OX1 3TA,UK. 13 Department of Cardiovascular Medicine and Oxford Acute Vascular Imaging Centre, 14 University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK. 15 Department of Pharmacology, University of Oxford, Oxford, OX1 3QT, UK. 16 These authors contributed equally to this work. 17 Current address: Gorlaeus Laboratory, Leiden Institute of Chemistry, Leiden University, 18 Einsteinweg 55, The Netherlands. 19 Current address: School of Chemistry, Faculty of Natural and Environmental Sciences, 20 University of Southampton, Highfield, Southampton, SO17 1BJ, UK. 21 Current address: Pharmacy Department, Yarmouk University, Irbid, Jordan. 22 Current address: School of Life Sciences, University of Nottingham, NG7 2UH, UK. 23