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AFM image and force-extension curves for S103C huPrP90-231 amyloid fibrils. (a) AFM height image obtained in tapping mode. Z-scale is 10 nm. (b) Superposition of three representative force-extension curves showing elastic stretching behavior (at a pulling rate of 9.4 nN/s). (c) A fit of one of these curves according to the WLC model with a persistence length of 0.4 nm. The contour length derived from this particular fit is 24.2 nm.
