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(a) Cell growth on different hydrogels after 1 and 3 days of culture (Comparing the data of each group with the OD value of the OSA–CMCS group on the first day, * p < 0.05, there is a significant difference. (b) ESEM of cells growing inside the hydrogel. (c) Light micrograph of cells growing inside the hydrogel. (d) Fluorescence staining of cells growing inside the hydrogel.
