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![[Figure 4]](rr5230fig4mag.jpg)
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Figure 4
Topologies of the central base pairs (residue 9 and symmetry-related residue 10) in ten analyzed structures. The numbers in the insets indicate the Saenger base-pair notation (Saenger, 1984  ) assigned by the PDB during deposition. Steps labeled `?' have the base-pair type unassigned; no base-pairing information was provided for the pairs labeled NA. We highlight potential Watson–Crick pairs in yellow. |
![[Figure 4]](rr5230fig4.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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