1. The Walter & Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia, School of Chemistry, University of Melbourne, Melbourne, Victoria 3010, Australia, ITC-CNR, Institute of Biophysics, Via Sommarive 18, 38050 Povo (Trento), Italy, Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, Via Sommarive 14, 38050 Povo (Trento), Italy, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Vecna pot 111, 1000 Ljubljana, Slovenia