Randall Centre for Cell and Molecular Biophysics, Kings College London, London, UK.|Randall Centre for Cell and Molecular Biophysics, Kings College London, London, UK.|Randall Centre for Cell and Molecular Biophysics, Kings College London, London, UK.|Electron Microscopy Science Technology Platform, The Francis Crick Institute, London, UK.|Electron Microscopy Science Technology Platform, The Francis Crick Institute, London, UK.|Randall Centre for Cell and Molecular Biophysics, Kings College London, London, UK.|Randall Centre for Cell and Molecular Biophysics, Kings College London, London, UK.