Affiliation: | From the ‡Department of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany and ;Departments of ¶Molecular and Cellular Biochemistry and ;‖Chemistry and ;**Kentucky Center for Structural Biology, University of Kentucky, Lexington, Kentucky 40536-0084 |