Peixuan Guo, Professor of Biomedical Engineering, Professor of Molecular Virology, and Director of the Laboratory of Gene Therapy, has created a single-molecule imaging system that allows researchers to view DNA, RNA, and similar biological molecules. This new system, more powerful and sensitive than optical microscopes, has answered a long-standing question about the number of packaging ribonucleic acid (pRNA) molecules in the phi29 nanoscale biological motor. University News Service has the full story.