1. Department
for Biology, Institute for Zoology, University of Cologne, Zülpicher
Straße 47b, D-50674 Cologne, Germany
2. Applied
Zoology, Department of Biology, Technical University of Dresden, Zellescher Weg 20b, D-01062 Dresden, Germany
3. Neurobiology
and Genetics, Theodor-Boveri-Institute, Biocenter, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany