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(a) NH–NH region of NOESY spectra of Tα1 in presence of HA 0.4% (w/w); (b) 15N-HSQC of Tα1 at natural abundance of rare isotope of Tα1 in presence of HA 0.4% (w/w) with individual assignments; (c) Chemical shift index (CSI) graphical representation obtained with the software NMRView according to Wright’s protocol [57] (see text). The algorithm predicts a helical conformation in the tract 1–5 of the peptide in presence of HA and an extended conformation in the rest of sequence.
