1. Biology Unit, Department of Pre-School, Education University of Thessaly, Volos 38221, Greece
2. DNA Repair Laboratory, Institute of Biology, National Center for Scientific Research “Demokritos”, 153 10 Aghia Paraskevi, Athens, Greece
3. Department of Chemistry, University of Sheffield, United Kingdom
4. Grup de Mutagenesi, Departament de Genetica I de Microbiologia, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain