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Effects of microsphere incorporation on thickness of rings cultured in differentiation medium. Images of rings seeded with (A) 0, (B) 0.2, or (C) 0.6 mg/106 cells and cultured for 14 days and (D) their average wall thicknesses. Scale = 1 mm; n = 8 for the 0 mg group; n = 9 for the 0.2 and 0.6 mg/106 cells groups, *p < 0.05. Values are mean ± SD.
