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Human mesenchymal stem/stromal cells (hMSCs) in four different cell culture systems. Schematic illustration of the four 3D cell culture systems: (a) hMSCs seeded as low cell number aggregates; (b) hMSCs seeded as a high cell number aggregate; (c) hMSCs encapsulated in alginate hydrogels modified with arginine‐glycine‐aspartic acid (RGD); and (d) hMSCs encapsulated in alginate hydrogels without modification
