Figure 1From: Tissue engineering: chondrocytes and cartilageThe changes in expression of genes in human articular cartilage chondrocytes with increasing passage in culture, detected using RT-PCR. Passage 0 refers to cells that are freshly isolated from the tissue and have not been cultured. GAPDH, glyceraldehyde phosphate dehydrogenase; IHH, indian hedgehog; XT, xylosyltransferase.Back to article page