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Application of 1H detected FSR pulse sequence on uniformly 2H, 13C, 15N labeled Ala (residual protonation level is 1%). The 1HN 1D spectra are shown when the REDOR π pulse trains are on (a) 13Cα region, (b) 13CO region, and (c) 13CH3 region. S0 spectrum is in black (collected without REDOR π pulses on 13C channel) and S spectrum is in red (collected with REDOR π pulses on 13C channel)
