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. 2015 Jul 28;6:7831. doi: 10.1038/ncomms8831

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(a) AFM height image. Infrared absorption map at (b) 1,700 cm⁻¹ (amide I), (c) 1,655 cm⁻¹ (amide I), (d) 1,300 cm⁻¹ (amide III). Scale bar, 2 μm. (e) Infrared spectra. (f) Average oligomeric infrared spectrum and secondary-structure deconvolution of amide I band.