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(a) Scheme of silk fibroin production using regenerated silk (RS); (b) Visual appearance of the RS/yeast film and (c) FESEM image of silk nanofibrils; (d,e) FTIR spectra of regenerated silk and RS/yeast films, respectively. The coloured lines represent the components of the amide I band and are indicated as β-sheets (B), random coils (R), and turns (T); (f) XRD results of regenerated silk and RS/yeast films.
