1. Department of Chemical Biology and Theraputics, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105 United States
2. Howard Hughes Medical Institute, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105 United States
3. Department of Structural Biology, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105 United States
4. Department of Surgery, Laboratory of Epithelial Cancer Biology, Memorial Sloan Kettering Cancer Center, New York, New York 10065 United States