1Division of Hematology, The Children’s Hospital of Philadelphia, PA; 2Combined Degree Program and Cell and Molecular Biology Group, University of Pennsylvania, Philadelphia; 3Division of Oncology, The Children’s Hospital of Philadelphia, PA; 4Cold Spring Harbor Laboratory, Cold Spring Harbor, NY; 5Division of Hematology/Oncology, Northwestern University, Chicago, IL; and 6Center for Comparativ...

Departments of 1Immunology and 2Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel; 3Department of Biomedical and Pharmaceutical Sciences, University of Montana, Missoula, MT; 4Cold Spring Harbor Laboratory, Cold Spring Harbor, NY; 5Department of Molecular Biology, Max Planck Institute of Biochemistry, Martinsried, Germany; 6Center for Integrated Protein Science Munich and Insti...