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Comparison of 2D expansions of the13C-13C correlation spectra of (A) U-DsbB, (B) U-DsbB/DsbA, (C) U-DsbA and (D) DsbB/U-DsbA. The spectra were collected at 750 MHz (1H frequency) with a spinning speed of 12.5 kHz and 25 ms DARR mixing.