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Dual graph representations for a 23S rRNA fragment (PDB ID: 6PRV) and an internal ribosomal entry site (IRES, PDB ID: 7A01). The stems are colored red and loops grey in the 3D structures. The different loops are labeled in the 2D structures and dual graphs. For the 2D structures (middle), an arrow is drawn at the 5 end to show the sequence direction, and some residue numbers are given.
