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The appearance of cell/hydrogel constructs after a certain culture time in vivo (a), quantitative determination of sGAG/DNA (b), H&E staining (c), TB staining (d) and SO staining (e) of cell/hydrogel constructs after being cultured in vivo for 1, 2 and 4 weeks (*P < 0.05, **P < 0.01, ***P < 0.001).
