1. Animal Physiology Group, Department of BiologyUniversity of Kaiserslautern D‐67663 Kaiserslautern Germany
2. Institute of Clinical Neuroanatomy, Neuroscience CenterGoethe‐University Frankfurt, Theodor‐Stern‐Kai 7 D‐60590 Frankfurt am Main Germany
3. Genetics/Epigenetic Group, Department of Biological SciencesSaarland University D‐66123 Saarbrücken
4. Department of Biological SciencesUniversity at BuffaloState University of New York Buffalo NY 14260 USA