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(a) Percentage of light transmission and (b) water vapor transmission rate of silk sericin/PVA films cross-linked with genipin at different concentrations: (○) 0, (•) 0.01, (▲) 0.025, (◆) 0.05, (■) 0.075, and (∗) 0.1% w/v. *P < 0.05, significant against the values of non-cross-linked films at corresponding time.
