1. Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
3. Microscopy Facility, Huck Institute of the Life Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, United States