1. Unit of Biochemical Toxicology, Department of Biochemistry, Stockholm University, Wallenberg Laboratory, S-106 91 Stockholm
2. Division of Biochemistry, Department of Pharmaceutical Biosciences, Uppsala University Biomedical Center, Box 578, S-75123 Uppsala
3. Department of Biochemistry, Uppsala University, Biomedical Center, Box 576, S-75123 Uppsala, Sweden