Age-positions are not found in datasets without a significant age-regulation. Plots show k-means absolute correlation clusters from kidney medulla dataset (A), or from brain cortex (B). The red circles connected by red lines represent the cluster centroids. The 95th percentile depicted in blue represents the major trends in the cluster. The 99th percentile shows the within cluster variation. The number of probes per cluster, as opposed to the total number of identified significant probes is denoted in the title of each plot.