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Lattice interactions in crystals of PLRV pseudoknot RNA. Nucleotides of individual pseudoknot molecules (carbon atoms of the reference pkRNA are colored in yellow) involved in inter-molecular interactions include a, the looped-out U12, b, the A8 cap, and c, residues of the linker between stem 1 and loop 2. Residues from symmetry-related pseudoknot molecules are colored differently and are labeled, and hydrogen bonds are thin dashed lines.
