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Interactions by selected SRL 2′-OD groups with a backbone orientation. (A) U56 and A57, (B) G68, (C) U53 and (D) G64. The color code matches that in Figure 3A, except for phosphate groups which are colored orange (P) and red (O). Residues are labeled, H atoms are colored in white and H-bonds are drawn with thin solid lines.
