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AFM force spectroscopy for Aβ42 dimer (a) A typical Force-distance approach curve (black) and retract curve (red). Blue line attached with force curve indicates WLC fitting (equation 1) that estimates rupture force (F) and contour length (Lc). (b) Force and (c) contour length histograms fitted with Gaussian function (N = 206), the force value and Lc values shown as mean ± S.E.M.; N is number of data used.
