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The correlation between crystal contacts of our new ubiquitin crystal structure and the perturbation of the solid state chemical shift (shown in green). Residues that have perturbed chemical shifts, including, solvent exposed part of helix 1 (Glu24, Asn25, and Asp32), have close contacts with loop α2-β5 (Asn60 and Glu64) and some of them form intermolecular hydrogen bonds.
