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(a) Transparency of curcumin-loaded silk fibroin film (the background is white paper printed with the SWU logo, scale bar 10 mm), (b) free-standing curcumin-loaded silk fibroin film in the dry state, (c) hydrated films follow surface contours (scale bar: 10 mm), and (d) silk fibroin films can be loaded with a range of curcumin concentrations.
