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(a) Representative images of the live/dead assay at 1 and 7 days on the hydrogel (Green: live cells, Red: dead cells). (b–d) The concentrations of the growth factors, TGF-β1, VEGF, and bFGF, secreted by BM-MSCs cultured in hydrogels for 1 and 3 days (Con and Gel represented the control and hydrogel groups, respectively. *p < 0.05, **p < 0.01).
