1. Department of Physics; Stanford University; Stanford CA 94305 USA
2. Department of Molecular Biology; Princeton University; Princeton NJ 08544 USA
3. Department of Bioengineering; Stanford University; Stanford CA 94305 USA
4. Department of Physics; Princeton University; Princeton NJ 08544 USA
5. Lewis-Sigler Institute for Integrative Genomics; Princeton University; Princeton NJ 08544 USA
6. Department of Microbiology and Immunology; Stanford University School of Medicine; Stanford CA 94305 USA