1. Biochemical Engineering Institute; Saarland University; Campus A1.5 D-66123 Saarbruecken Germany
2. GENE-FACTS, Science Park II Saar; Stuhlsatzenhausweg 69 D-66123 Saarbruecken Germany
3. Leibniz-Institute for Zoo and Wildlife Research; Postfach 601103 D-10252 Berlin Germany