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. 2020 Jan 4;49(2):145–153. doi: 10.1007/s00249-019-01420-0

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© The Author(s) 2020

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Fig. 7 — (a–b) Atomic force microscopy imaging of insulin aggregated in ammonium acetate, pH 4.0, in the absence (a) and presence (b) of 30% (vol/vol) EtOH. The scale bar is 2 µm