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Osteochondral defects of 3 mm were generated in the knees of rabbits (a) and covered with alginate alone (b, e), alginate containing 2 × 106 rabbit primary chondrocytes (c, f), or alginate containing 2 × 106 hDPSCs (d, g). The animals were sacrificed 3 months after surgery. Representative macroscopic images of the animals (n = 3) are shown.
