1. Department
of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
2. Department
of Chemistry and Biochemistry, California Polytechnic State University, San
Luis Obispo, California 93407, United States
3. Center
for the Physics of Living Cells, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States