1. Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
2. Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
3. Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
4. Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
5. Center for Nucleic Acids Science & Technology, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA