1. Department of Biochemistry, Arrhenius Laboratories, Stockholm University, S-10691 Stockholm, Sweden
2. Department of Cellular and Molecular Pharmacology, AstraZeneca Novum, S-14157 Huddinge, Sweden
3. Department of Molecular Biology, Odense University, DK-5230 Odense M, Denmark
4. Department of Bioanalytical Chemistry, AstraZeneca R&D Mölndal, S-43183 Mölndal, Sweden