Chul-Hyun Kim1, C. Cheng Kao2 and Ignacio Tinoco Jr.1 Nature Struct. Biol. 7, 415–423 (2000).

In this paper, the legend for Fig. 6 was mistakenly replaced by the legend for Fig. 4. The correct legend for Fig. 6 is printed below. We apologize for this error and any confusion it may have caused.

Fig. 6 Detailed structural characteristics of SL13. a, The stacking interactions in the triloop region. For simplicity, only bases are displayed except for the ribose ring of U7. b, The hydrogen bonds from the syn A8 to A6 are shown in green, as well as the electrostatic interaction between the amino group of A6 and the 5′ phosphate group of G4 in yellow. c, A space-filling model of the energy minimized average structure of SL13. The amino group of A6 and the 5′ phosphate group of G4 are in yellow.