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15N spectra from the f1 projections of the 1H,15N HSQC spectra of mixtures of peptides [15N]1a and [15N]1b. Spectra were recorded at 8.0 mM total concentration and varying mole fractions of peptide in 9:1 H2O/D2O at 600 MHz and 293 K. The mole fraction of peptide [15N]1b is designated χB.
