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Possible fibril cross-sections. (A) The observed widths of unsonicated and sonicated RiAFP fibrils are consistent with monomeric thickness in one transverse dimension and (most likely) dimeric thickness in the other. (B) SBAFP fibrils, both unsonicated and sonicated, show variable width. We assume it is most likely that they are of monomeric thickness in one transverse dimension and multimeric (with variable multimer number) in the other transverse dimension.
