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P7D3 forms nanofiber assemblies. (a) EM images of P7D3 nanofibers obtained by TEM (3 mg/mL), cryo-TEM (1 mg/mL), and SEM (lyophilized powder). (b) SAXS patterns show a cylindrical form factor, as indicated by the −1 slope at low q of the aqueous sample, and a scattering peak of the powder sample suggesting a feature size of 5–8 nm.
