Relative orientation of RNA helices in a group 1 ribozyme determined by helix extension electron microscopy.
Nakamura TM, Wang YH, Zaug AJ, Griffith JD, Cech TR. Relative orientation of RNA helices in a group 1 ribozyme determined by helix extension electron microscopy. EMBO J. 1995 Oct 02; 14(19):4849-59.