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Second derivatives of the FTIR spectra obtained for S-fibrils (a), R-fibrils (b), and daughter fibrils (c) produced in the following seeded reactions: the reaction was seeded with R-fibrils (3%) and carried out under shaking (solid line) or the reaction was seeded with S-fibrils (3%) and carried out under rotation (dashed line). a and b show three independent preparations of S- and R-fibrils, respectively.
