Figure 5From: Human meniscus cells express hypoxia inducible factor-1α and increased SOX9 in response to low oxygen tension in cell aggregate cultureCollagen P4H isoenzyme gene expression in articular chondrocytes aggregates. Prolyl 4-hydroxylase (P4H)α isoenzyme gene expression in cell aggregates of articular chondrocytes in 20% oxygen (white bars) and 5% oxygen (black bars). Data are expressed as mean ± standard deviation (n = 3).Back to article page