[1] Vienna Bioctr, IMP, Res Inst Mol Pathol, Vienna, Austria
[2] Hannover Med Sch, Lab Expt Cell Therapy, D-3000 Hannover, Germany
[3] Hannover Med Sch, Inst Cell & Mol Pathol, D-3000 Hannover, Germany
[4] Childrens Hosp, Med Ctr, Dept Expt Hematol, Cincinnati, OH 45229 USA