1. Department of Biology, Duke University , Durham, NC , USA
2. School of Medical Science, The University of Sydney , Sydney, New South Wales , Australia {C}%3C!%2D%2D%7C%7CrmComment%7C%7C%3C~show%20%5BAQ%20ID%3DAQ3%5D~%3E%2D%2D%3E
3. School of Life and Environmental Science, The University of Sydney , Sydney, New South Wales , Australia {C}%3C!%2D%2D%7C%7CrmComment%7C%7C%3C~show%20%5BAQ%20ID%3DAQ4%5D~%3E%2D%2D%3E
4. Center for Genomic and Computational Biology, Duke University , Durham, NC , USA