Figure 1From: Reference genes for normalization of gene expression studies in human osteoarthritic articular cartilageAverage expression stability, M, of prospective reference genes. Values of M were obtained with the geNorm software that compares gene expression without accounting for experimental groups and proceeds to the stepwise exclusion of the genes whose relative expression levels are more variable among tissue samples. Lower values of M correspond to the most stable genes, hence the most suitable for normalization.Back to article page