1Sensory Circuits and Neurotechnology Laboratory, The Francis Crick Institute, London, United Kingdom
2Carl Zeiss Microscopy GmbH, Oberkochen, Germany
3ESRF, The European Synchrotron, Grenoble, France
4Electron Microscopy STP, The Francis Crick Institute, London, United Kingdom
5Department of Neuroscience, Physiology and Pharmacology, University College London, London, United Kingdom
6Present address: Carl Zeiss GmbH, Oberkochen, German