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Phase contrast images of the chondrocytes cultured in collagen gels at day 1, day 7, and day 14. A, D, G 0.5 mg/ml collagen gels; B, E, H 1 mg/ml collagen gels; C, F, I 2 mg/ml collagen gels. A–C culture day 1; D–F culture day 7; G–I culture day 14
