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Local motions in E-P4 in the absence of Mg2+ from motional narrowing of resonances. Shown are the normalized resonance intensities as a function of residue in (A) P4 and (B) E-P4 obtained from nonconstant time 1H–13C HSQC experiments. Intensities for a given type of C-H vector are normalized relative to a minimum value of 0.1 indicated by a horizontal line (Zhang et al. 2006).
