Affiliation: | 1. Department of Molecular Genetics and Microbiology, Duke University, Durham, NC 27710, USA;2. Howard Hughes Medical Institute, Department of Biology, Duke University, Durham, NC 27708, USA;3. Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA;4. Department of Biochemistry, Duke University, Durham, NC 27710, USA |