1. Biocenter Oulu and Department
of Biochemistry, University of Oulu, P.O.
Box 3000, Oulu, FI-90014, Finland
2. Protein Structure Section, Macromolecular
Crystallography Laboratory, National Cancer Institute, Frederick, Maryland 21702, United States
3. Theodor-Boveri-Institut für
Biowissenschaften (Biozentrum) der Universität Würzburg, Am Hubland, D-97074 Würzburg,
Germany