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The effect of oxygen and osmolarity on the chondrocyte phenotype. (A) Expression of type I collagen, (B) type II collagen, (C) Sox9, (D) aggrecan, and (E) the ratio type I collagen/type II collagen expression. N.D. indicates that type I collagen expression was not detectable. Bars represent the mean of n = 3 ± the standard error of the mean. §Difference from 3% oxygen level; *difference from 330 mOsm level.
