Comparison of the NMR 1H-15N SOFAST-HMQC spectrum of 20 µM Aβ(1–40) and Aβ(1–42) in the absence and presence of STAB-MAb. NMR spectra of 15N isotopically labelled Aβ(1–40) in the absence (A) and presence (B) of a 1:3 ratio STAB-MAb. (D) The same spectrum of 15N isotopically labelled Aβ(1–42) in the absence (C) and presence (D) of a 1:3 ratio of STAB-MAb. The figures show the region of the resonances corresponding to the backbone amide groups. Peaks were labelled according to published assignments.