Heat diagram of intensities. Self organizing maps (SOMs) were used to generate an image of clustered intensity data from 26 pairwise experiments. The individual channels from these experiments are parsed out and arranged by tissue type as indicated in the top row text. The normalized intensities are indicated as high expression (yellow), moderate (red), low (blue) and missing value (below background; black). The diagram represents averaged data from the duplicated elements within each microarray. Brackets show ten SOM clusters with the tissue type and percentage of the total number of microarray elements in the right text column.