Figure 2

Three distinct measures used to calculate the persistence length. The data were generated from the fibrils plotted in Figure 1. (a) cos θ, (b) mean square of the end-to-end distances R, and (c) mean square of the deviations δ to secant midpoints, as a function of ℓ (see main text for details). Red diamonds, blue squares, and green circles represent data for three different amyloid fibrils. Lines: fits of the worm-like chain model to the data (according to the equations indicated in the main text). Persistence lengths (P) derived from the fits are indicated in Figure 1 (same color as the fitted curves).