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(a) Cell survival rate versus BSA hydrogel extract in cytotoxicity test; (b) BSA hydrogel digested by proteinase K; (c) Fluorescence images of the digested BSA hydrogel excited at a wavelength of λ = 470 nm and λ = 595 nm and collected using a λ = 530 nm optical filter and a λ = 630 nm optical filter, respectively.
