1. W. M. Keck Laboratory for Biomolecular Imaging, Department of Chemistry, New York University, 31 Washington Place, New York, NY 10003, USA.
2. Courant Institute of Mathematical Sciences, Department of Computer Science, New York University, 251 Mercer Street, New York, NY 10012, USA.
3. The Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA.
4. Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.
5. Celera Genomics, 45 West Gude Drive, Rockville, MD 20850, USA.