1. Centre for Respiratory Biology, UCL Respiratory, University College London, London WC1E 6JF, U.K.
2. Institute of Structural and Molecular Biology/Birkbeck, University of London, London WC1E 7HX, U.K.
3. Department of Medicine, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/Medical Research Council Building, Hills Road, Cambridge CB2 0XY, U.K.
4. London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, U.K.
5. School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
6. Department of Biology and Biotechnologies ‘Charles Darwin’, Sapienza University of Rome, Rome 00185, Italy
7. Departamento de Biologia Celular, Genetica y Fisiologia, Facultad de Ciencias, Campus Teatinos, Universidad de Malaga, Malaga 29071, Spain