Heatmap visualization of Exon array pairwise probe correlations. Heatmap visualization of probe intensities of CD44 (Exon array transcript cluster 3326635). Each cell of the heatmap shows the correlation of two probe intensities among 11 tissues (breast, cerebellum, heart, kidney, liver, muscle, pancreas, prostate, spleen, testes, and thyroid). The top color bar indicates the probe annotation type, core probes (red), extended probes (blue), full probes (yellow). The signal intensities of core probes tend to have high correlation (the top right corner of the heatmap).