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Different representations of the S/R motif from helix- 95 of H. marismortui 23S rRNA. Left: 2D structure of 5 × 4 nt asymmetric internal loop, 3D stereo view from PDB ID 1S72 showing non-canonical base pairs. Right: 2D diagram with annotation of all five non-canonical interactions in structure of S/R motif.
