2L3Z:
reference: A Proton-Detected 4D Solid-State NMR Experiment for Protein Structure Determination., Huber M, Hiller S, Schanda P, Ernst M, Bockmann A, Verel R, Meier BH, Chemphyschem. 2011 Apr 4;12(5):915-8. doi: 10.1002/cphc.201100062. Epub, 2011 Feb 15. PMID: 21442705

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