1. School of Biosciences, University of Birmingham, Birmingham, B15 2TT, U.K.
2. School of Computer Science, University of Birmingham, Birmingham, B15 2TT, U.K.
3. The Alan Turing Institute, London, NW1 2DB, U.K.
4. Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham, Birmingham, B15 2TT, U.K.
5. University of Nottingham, Midlands, NG7 2RD, U.K.