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Aggrecan, collagen I and collagen II expression all normalized to chondrocyte monoculture expression upon cell seeding and the collagen II/I expression ratio. Dashed line indicates the starting level of gene expression in each cell type. * indicates a statistically significant difference from the day 0 gene expression levels (p<0.05). ‡ indicates a statistically significant difference from the 0 ng/ml cultures of the same cell population levels (p<0.05).
