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AFM images (amplitude mode) of oligomeric forms of huPrP N-terminal fragments. (a) huPrP23–144 fibrils. (b) Enlarged image of an individual huPrP23–144 fibril. (c) Aggregates formed by huPrP23–139. (d) Bundled huPrP23–141 fibrils. Incubation conditions were identical to those described in the legend to Fig. 3.
