1. 1 From the James Ewing Laboratory of Developmental Hematopoiesis, Sloan-Kettering Institute for Cancer Research; Division of Hematology-Oncology, Weill Medical College of Cornell University; and Division of Pulmonary and Critical Care Medicine, The New York Hospital–Cornell Medical Center, New York, NY; the Center for Molecular Biology and Genetics, and Department of Medical Chemistry, Faculty of Medicine, Kyoto University, Japan; and the Department of Pathology, Sapporo City General Hospital, Japan.