1. Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA
2. Renaissance Computing Institute, University of North Carolina, 100 Europa Drive, Suite 540, Chapel Hill, NC 27517, USA
3. Center for Genomic and Computational Biology, Duke University, 101 Science Drive, Durham, NC 27708, USA
4. Division of Environmental Genomics and Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
5. Department of Biology and School of Information and Library Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3280, USA