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Viability staining of MSCs in HA hydrogel constructs after 28 days of in vitro culture for groups containing microspheres with TGF-β3 (MS+T), containing empty microspheres either in chondrogenic media (MS-T+CM) or in standard growth media (MS-T-CM), or with TGFβ-3 alone (T only). Green: live cells; Red: dead cells; scale bar = 100 μm.
