Hydrogen bonds are indicated by the green dotted lines. The N6 amino group of A23 donates a hydrogen to N7 of A9. Similarly, the N6 amino group of A9 donates a hydrogen to N7 of A23.

Show the H-bonds for this base triple on the 3-D structure. <>
Show only the tertiary interaction region: <>

Show only the A9:A23-U12 base triple with H-bonds: <>

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Nucleotide numbering help.