Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk|Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk|Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk|Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk|Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk|Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk|Biophysical Sciences Institute, Durham University, Durham, UK. thomas.rodgers@durham.ac.uk