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Quantity of type II collagen per mg of tissue wet weight pre-implantation and after 30 or 60 days of culture in vivo. Extractable type II collagen content increased significantly from pre-implantation to 30 days of in vivo culture (p<0.01). Type II collagen further increased from 30 days to 60 days of in vivo culture (p<0.01). Error bars depict standard deviation.
