1. Department
of Mathematics and Center for Theoretical Biological Physics, University of California, San Diego, La Jolla, California 92093-0112, United States
2. Department
of Mathematics, University of California, San Diego, La Jolla, California 92093-0112, United States
3. Soft
Matter and Functional Materials, Helmholtz-Center Berlin, 14109 Berlin,
Germany, and Physics Department, Humboldt-University of Berlin, 12489 Berlin, Germany
4. Department
of Chemistry and Biochemistry, Department of Pharmacology, Center
for Theoretical Biological Physics, and Howard Hughes Medical Institute, University of California, San Diego, La Jolla, California 92093-0365, United States