Author information:
(1)Department of Pharmacology and Chemical Biology, University of Pittsburgh 
School of Medicine, Pittsburgh, PA 15213, USA; University of Pittsburgh Cancer 
Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, 
USA.
(2)Department of Chemistry, University of Illinois at Chicago, Chicago, IL 
60607, USA.
(3)Department of Physics and Astronomy, University of South Carolina, Columbia, 
SC 29208, USA.
(4)School of Molecular Biosciences, Washington State University, Pullman, WA 
99164, USA.
(5)Department of Microbiology and Molecular Genetics, University of Pittsburgh 
School of Medicine, Pittsburgh, PA 15213, USA; University of Pittsburgh Cancer 
Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, 
USA.
(6)School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK.
(7)Center for Biologic Imaging, University of Pittsburgh School of Medicine, 
Pittsburgh, PA 15261, USA.
(8)Department of Chemistry, University of Illinois at Chicago, Chicago, IL 
60607, USA. Electronic address: jhmin@uic.edu.
(9)Department of Pharmacology and Chemical Biology, University of Pittsburgh 
School of Medicine, Pittsburgh, PA 15213, USA; University of Pittsburgh Cancer 
Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, 
USA. Electronic address: vanhoutenb@upmc.edu.