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. 2014 Oct 13;42(20):12758–12767. doi: 10.1093/nar/gku934

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© The Author(s) 2014. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Sequence and structure of the sarcin/ricin loop (SRL) RNA molecule. (A) Numbering system for ribose hydrogen atoms. (B) Sequence and secondary structure of the SRL. Solid lines, Watson–Crick base pairs; broken line, sheared A-G base pair. Important features of the SRL are boxed: yellow, GUA base triple; blue, conserved residues flanking the GUA base triple; green, GNRA tetraloop. Nucleotides are numbered as referred to in the text. (C) Three-dimensional structure of the SRL (PDBID 1Q9A). Blue, yellow and green residues correspond to the color scheme in (B).