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- [24] Magnitudes and orientations of the principal elements of the H-1 chemical shift, H-1-N-15 dipolar coupling, and N-15 chemical shift interaction tensors in N-15(epsilon 1)-tryptophan and N-15(pi)-histidine side chains determined by three-dimensional solid-state NMR spectroscopy of polycrystalline samples JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1997, 119 (43) : 10479 - 10486