1. Division of Cell and Molecular Biology, Faculty of Natural Sciences, Imperial College London, London SW7 2AZ, UK.
2. Department of Structural Biology and Bioinformatics, University of Geneva Medical School, 1211 Geneva, Switzerland.
3. Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland.
4. Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA.
5. Department of Entomology and the Institute for Integrative Genome Biology, University of California, Riverside, CA 92521, USA.