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(A) The presence of secondary structure for residues S21–Q24 is indicated by a number of interresidue 1H-1H NOEs (1–5), positive heteronuclear 1HN-15N NOEs, and chemical shift index values for Cα, Cβ, and Hα atoms [parts per million (ppm)] that are consistent with a helix. (B) 2D planes from a 15N-edited 3D-NOESY-heteronuclear single quantum coherence (HSQC) show interresidue 1H-1H NOEs (red boxes) throughout this region.
