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Pairing-up scheme of the 16-mer RNA strands in the monoclinic (top) and the rhombohedral crystal forms (bottom), including the G–G cis Watson–Crick/Hoogsteen pairs (according to Leontis and Westhof 2001). Residues in the syn conformation are emphasized. Dangling ends are indicated in the monoclinic form. Residues belonging to neighboring duplexes in the crystal lattice are indicated in gray.
