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. 2014 Jan 27;111(6):E663–E671. doi: 10.1073/pnas.1400126111

Fig. 2.

Fig. 2.

(A–C) ITC of preQ1 titration with Spn preQ1-II riboswitch at pH 6.3, 25 °C in 60 mM KCl (A), 60 mM KCl and 3 mM CaCl2 (B), and 60 mM KCl and 3 mM MgCl2 (C). (D–F) One-dimensional imino proton spectra (800-MHz NMR) of 0.2 mM Spn preQ1-II riboswitch at pH 6.3, 27 °C in 60 mM KCl (D), 60 mM KCl and 3 mM CaCl2 (15 equivalents) (E), and 60 mM KCl, 3 mM CaCl2, and 2 equivalents of preQ1 (F).