1. Department of Genetics, University of Cambridge, Cambridge CB2 3EH, United Kingdom
2. Institute of Genetics, Martin Luther University, D-06120 Halle, Germany
3. Department of Genetics and Molecular Biology, University of Szeged, 6726 Szeged, Hungary
4. Department of Molecular Biology, Umeå University, S-901 87 Umeå, Sweden
5. Institute of Molecular Biotechnology, Austrian Academy of Sciences, A-1030 Vienna, Austria
6. Zoologisches Institut der Universitat Zurich, 8057 Zurich, Switzerland
7. Biologie du Developpement, CNRS, Institute Jacques Monod, FR-75251 Paris, France
8. Institut für Genetik, Universität Mainz, 55128 Mainz, Germany
9. Lehrstuhl für Genetik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
10. Department of Developmental Genetics, A040, Deutsches Krebsforschungszentrum, D-69120 Heidelberg, Germany
11. Departament de Genetica, Facultat de Biologia, Universitat de Barcelona, 08028 Barcelona, Spain
12. Institute of Zoology, University of Regensburg, D-93040 Regensburg, Germany
13. Développement, Evolution, Plasticité du Système Nerveux, CNRS, 91190 Gif-sur-Yvette, France