Abbondanzieri, Elio A, William J Greenleaf, Joshua W Shaevitz, Robert Landick, and Steven M Block. (2005) 2005. “Direct Observation of Base-Pair Stepping by RNA Polymerase.”. Nature 438 (7067): 460-5. Reference Link
Shaevitz, Joshua W, Elio A Abbondanzieri, Robert Landick, and Steven M Block. (2003) 2003. “Backtracking by Single RNA Polymerase Molecules Observed at Near-Base-Pair Resolution.”. Nature 426 (6967): 684-7. Reference Link