1. Institute for Molecular Bioscience, University of Queensland, Queensland 4072, Australia
2. Centre for Microscopy and Microanalysis, University of Queensland, Queensland 4072, Australia
3. School of Biomedical Sciences, University of Queensland, Queensland 4072, Australia
4. National Centre for Biological Sciences, Bangalore, 560 065, India
5. Max Planck Institute for Molecular Cell Biology and Genetics, Dresden D-01307, Germany
6. Department of Biochemistry and Molecular Biology, Mayo Clinic and Foundation, Rochester, MN 55905