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The interaction between two hairpin loops from the guanine-responsive riboswitch (PDB ID: 1Y27, chain: X, nucleotide numbers: 27–43 and 54–72). One loop is in cyan and the other is in magenta, with interacting residues in the loops colored yellow and green. Helical stems of the hairpin loops are in blue. This figure was prepared using the program PyMoL (http://www.pymol.org/).
