1. Institute for Experimental Cancer Research in Pediatrics,
2. Pediatric Hematology and Oncology, Children's Hospital,
3. Institute of Biochemistry I, and
4. Institute for Transfusion Medicine and Immunohematology, Goethe-University, Frankfurt, Germany; and
5. Experimental Pharmacology, Max Delbrück Center for Molecular Medicine, Berlin-Buch, Germany