1Q2N:
reference: Validation of helical tilt angles in the solution NMR structure of the Z domain of Staphylococcal protein A by combined analysis of residual dipolar coupling and NOE data., Zheng D, Aramini JM, Montelione GT, Protein Sci 2004 Feb;13(2):549-54. Epub 2004 Jan 10. PMID: 14718654

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