1. Howard Hughes Medical Institute, Duke University Medical Center, Durham, NC, USA5
2. Department of Genetics, Duke University Medical Center, Durham, NC, USA2
3. Department of Medicine, Duke University Medical Center, Durham, NC, USA1
4. Department of Microbiology, Duke University Medical Center, Durham, NC, USA3
5. Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA4