Figure 4From: Quality control in microarray assessment of gene expression in human airway epitheliumFrequency distribution of correlation coefficients calculated for pairwise comparisons. Shaded dark grey region represents pairwise comparisons (n = 285) where at least 1 sample failed the QC criteria. Light grey region represent pairwise comparisons (n = 276) where both samples pass QC criteria. The majority of samples passing the QC criteria have correlation values >0.94.Back to article page