1. Department of Structural and Molecular Biology, University College London, London WC1E 6BT, U.K.
2. Biological Mass Spectrometry & Proteomics Cell Biology, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, U.K.
3. Department of Biology II, Ludwig-Maximilians-Universität München, Planegg-Martinsried 82152, Germany
4. Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv 03680, Ukraine
5. Department of Cell and Developmental Biology, University College London, London WC1E 6BT, U.K.
6. Wellcome Trust–MRC Institute of Metabolic Science and MRC Metabolic Diseases Unit, Addenbrooke's Hospital, Cambridge CB2 OQQ, U.K.
7. MRC Mitochondrial Biology Unit, Wellcome Trust, MRC Building, University of Cambridge, Cambridge CB2 0XY, U.K.