Institute for Physical Science and Technology, University of Maryland, College Park, Maryland, United States of America.|Center for Computational Biology, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America.|National Human Genome Research Institute, Bethesda, Maryland, United States of America.|Center for Computational Biology, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America.|Center for Computational Biology, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America.|Institute for Physical Science and Technology, University of Maryland, College Park, Maryland, United States of America.