Additional file 2.

Ratio of COL2A1 to COL1A1 expression in healthy and osteoarthritic chondrocytes. The ratios of the relative gene expression levels of COL2A1 and COL1A1 in pellet cultures following 2 wk of redifferentiation in either 20% oxygen (gray bars) or 2% oxygen (white bars) were calculated. All values are the mean ratios from n = 5 donors. Error bars represent 1 SD. Statistical significance was determined by performing independent t-tests (between disease conditions) and paired t-tests (between oxygen levels). *P < 0.05.

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Markway et al. Arthritis Research & Therapy 2013 15:R92   doi:10.1186/ar4272