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Biodegradation profile of silk fibroin films. Weight loss % values of SF films in a protease (ENZ), phosphate-buffered saline (PBS), and simulated tear fluid (STF) over 4 weeks of incubation (a: aq plots; b: FA plots; c: HFIP plots (all without annealing); d: HFIP-water-annealed plots; e: HFIP-methanol-annealed plots; f: HFIP-steam-annealed plots) (n = 4; differences between asterisk (*)-marked groups were statistically significant with p ≤ 0.05).
