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. 2013 Jan 10;8(1):e50504. doi: 10.1371/journal.pone.0050504

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© 2013 Mithu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

2D ¹³C-¹³C spectra of U-¹³C-,¹⁵N-fMLF recorded using PARIS-xy (m = 1)(N = 1/2) recoupling scheme at MAS frequency of 30 kHz and an external magnetic field of 16.43 T. Mixing-time period in each case was 90 ms. Different proton RF amplitudes of (a) 7.3 kHz, (b) 16 kHz, (c) 24 kHz, and (d) 30 kHz were employed. Only a selected region of 2D spectrum, covering cross-peaks from each class, is shown in each case.