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1H–15N HSQC spectra of wild-type N-domain (red) and the loop-deletion variant WNDΔ1115–1138 (black) recorded in the presence of 5 mM ATP. The signals of the backbone amides of the invariant amino-acid residues are circled. The signal of His1069 at 8.45 and 125.4 p.p.m. (wild type) is located in a crowded area of the spectrum and is not shown.
