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(A–C) Stick representations of Lra preQ1-II riboswitch (PDB ID code 4JF2) (A), fluoride riboswitch (PDB ID code 4ENC) (B), and Bsu preQ1-I riboswitch structure (PDB ID code 2L1V) (C). (B, Inset) Sequence and secondary structure. (D) preQ1 base interactions in Bsu preQ1-I riboswitch.
