1. Departments of Experimental Oncology and Hematology-Oncology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA, and Department of Pediatrics, University of Tennessee College of Medicine, Memphis, TN 38163, USA, and Genelabs Inc., Redwood City, CA 94063, USA.
2. Department of Experimental Oncology, St. Jude Children's Research Hospital Memphis, TN 38105, USA.
3. Departments of Experimental Oncology and Hematology-Oncology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA and Department of Pediatrics, University of Tennessee College of Medicine, Memphis, TN 38163, USA.
4. Genelobs Inc., Redwood City, CA 94063, USA.