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Normalized CLEANEX-PM signal intensities of 15N-Spα (0.25 mM) and of Spα–Spβ mixtures (1:1.4 molar ratio). The spin-locking field was 5.0 kHz. Three different mixing times (75, 100, and 150 ms) were used, and no significant differences were observed. Accumulation time was 64 scans for Spα and 160 scans for Spα–Spβ mixture samples.
