Backtracking determines the force sensitivity of RNAP II in a factor-dependent manner.

Galburt E.A., Grill S.W., Wiedmann A., Lubkowska L., Choy J., Nogales E., Kashlev M., & Bustamante C. (2007). “Backtracking determines the force sensitivity of RNAP II in a factor-dependent manner.” Nature. 2007 Apr 12;446(7137):820-3. Epub 2007 Mar 14. (Abstract)