1. Physikalisch Chemisches Institut, Ruprecht-Karls University, D-69120 Heidelberg, Germany
2. Institute of Cardiovascular Sciences & School of Chemistry, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, B152TT, Birmingham, United Kingdom
3. Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Midlands, United Kingdom