Center for Theoretical Biological Physics, Rice University, Houston, Texas, United States of America.|Department of Physics, Northeastern University, Boston, Massachusetts, United States of America.|Center for Theoretical Biological Physics, Rice University, Houston, Texas, United States of America.|Center for Theoretical Biological Physics, Rice University, Houston, Texas, United States of America.|Center for Theoretical Biological Physics, Rice University, Houston, Texas, United States of America.|Center for Theoretical Biological Physics, Rice University, Houston, Texas, United States of America.|Department of Physics, Northeastern University, Boston, Massachusetts, United States of America.