1. Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
2. Institute for Physical Sciences and Technology, University of Maryland, College Park, MD 20742, USA
3. Pacific Biosciences, 1305 O'Brien Dr, Menlo Park, CA 94025, USA
4. Earlham Institute, Norwich Research Park Innovation Centre, Colney Ln, Norwich NR4 7UZ, UK
5. Departments of Biomedical Engineering, Computer Science, and Biostatistics, Johns Hopkins University, Baltimore, MD 21205, USA