1. Department of Human and Molecular Genetics, Virginia Commonwealth University, Richmond, VA 23298, USA
2. Department of Biology, Center for Chemical Methodology and Library Development at Boston University, Boston MA 02215
3. Alnylam Pharmaceuticals, Inc., Cambridge MA 02142
4. Department of Chemistry, Center for Chemical Methodology and Library Development at Boston University, Boston MA 02215
5. Program in Molecular Biology, Cell Biology, and Biochemistry, Boston University, Boston MA 02215
6. Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA
7. VCU Institute of Molecular Medicine (VIMM), Virginia Commonwealth University, Richmond, VA 23298, USA