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. Author manuscript; available in PMC: 2020 Aug 1.
Published in final edited form as: J Magn Reson. 2019 May 23;305:5–15. doi: 10.1016/j.jmr.2019.05.008

Figure 1.

Figure 1.

2D REDOR-filtered DARR pulse sequence. After 1.5 ms REDOR dephasing, only carbons without strong dipolar couplings to nitrogen remain, corresponding to (1) carbons without directly bonded N, and (2) carbons with directly bonded N that experience sufficient ms-timescale dynamics to significantly reduce the effective carbon-nitrogen dipolar coupling. DARR is used to observe 13C-13C correlations of these remaining carbons. In a protein, correlations with backbone CO and Ca in ω1 correspond to regions with ms timescale dynamic averaging of the dipolar coupling.