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Gene expression of human chondrocytes embedded in PEG hydrogel treated with TGF-β1 (white bars), FGF-2 (grey bars), and FGF-2/TGF-β1 (black bars) for the first week, then TGF-β1 for all groups. Gene expressions were normalized to week 1 with TGF-β1 only. A: Collagen type II expression. B: Aggrecan expression. C: Collagen type I expression. Asterisks indicate statistical significance between assigned groups (* p < 0.05; ** p < 0.01) (n = 3).
