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Right side: 2D 13C/13C correlation spectrum employing proton driven spin diffusion (50 ms) for homonuclear polarization transfer. Cross correlation signals of selected amino acids are highlighted in the spectrum. On the left side, four representative 1D slices through the spectrum are displayed. The spectrum was recorded at a nominal temperature of 0°C and a field strength of 14.1 T with a spinning frequency of 11 kHz.
