1. Biochemical Pharmacology, University of Konstanz, 78457 Konstanz, Germany
2. ECVAM, Institute for Health & Consumer Protection, European Commission Joint Research Centre, 21020 Ispra (VA), Italy
3. European Collection of Animal Cell Cultures, Centre for Applied Microbiology & Research, Porton Down, Salisbury SP4 0JG, UK
4. Pfizer Central Research, Amboise, Poce-sur Cisse, 37401 Amboise, France
5. Institute of Physiology, University of Innsbruck, Innsbruck, Austria