[1] Univ Chicago, Dept Chem, Inst Biophys Dynam, Chicago, IL 60637 USA
[2] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA
[3] Max Planck Inst Colloids & Interfaces, Dept Biomat, D-14424 Potsdam, Germany
[4] Aarhus Univ, Dept Chem, DK-8000 Aarhus, Denmark
[5] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus, Denmark
[6] Northwestern Univ, Dept Biomed Engn, Evanston, IL 60208 USA
[7] Northwestern Univ, Chem Life Proc Inst, Evanston, IL 60208 USA
[8] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA