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H&E- (a), collagen- (b), and GAG- (c) stained histological sections of hMSCs encapsulated in f-CarMa and a-CarMa hydrogels with cell densities of 25 (25 m), 60 (60 m), 100 (100 m), and 200 (200 m) million/mL after 21 days of incubation in chondrogenic medium/TGF-β1 supplemented with BMP-7. The scale bar in (a–c) is 20 μm. H&E, hematoxylin and eosin; GAG, glycosaminoglycan.
