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Minimum labelling: 13C
DARR stands for Dipolar Assisted Rotational Resonance. Magnetization is transferred from hydrogen to 13C nuclei. From here it is transferred to other 13C nuclei which are close in space.
This experiment is similar to the PDSD, but at long mixing times the transfer of magnetisation is more efficient and so you can expect to see more cross peaks.This experiment is useful in order to obtain inter-residue contacts for assignment and structure calculations.