1. NEUROTEC, Karolinska Institutet, S141 86 Stockholm, Sweden
2. Department of Structural Chemistry, Biovitrum, S112 87 Stockholm, Sweden
3. Department of Clinical Neuroscience, CMM L8:01, Karolinska Institutet, S171 76 Stockholm, Sweden
4. North Shore/LIJ Research Institute, 350 Community Drive, Manhasset, NY 11030-3849, U.S.A.
5. National Institute of Standards and Technology, 100 Bureau Dr Stop 8562, Gaithersburg, MD 20899-8562, U.S.A.
6. Department of Cell and Molecular Biology, Medical Nobel Institute, Karolinska Institutet, S171 77 Stockholm, Sweden