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(a) Viability of L929 mouse fibroblast cells cultured on 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) for (□) 24 h and (■) 72 h. (b) Morphology of L929 cells cultured on non-cross-linked silk sericin/PVA films and silk sericin/PVA films cross-linked with 0.1% w/v genipin for 24 h. *P < 0.05, significant against the values of non-cross-linked films.
