Figure 1: This figure shows a gene expression heatmap for a selected group of 25 genes (rows) and a treatment group of 25 chips/patients (columns). Furthermore, the expression data is analyzed by hierarchical clustering for both, chips and genes. The dendrogram on the top represents the chip hierarchy while the one on the left hand side shows the gene hierarchy. In addition, a classification of the chip data by pre-defined classifiers, in this case the cancer stage which was acquired by the clinical diagnoses in the study, is visualized by a colored band above the heatmap. Thus the user can determine here if there is a correlation between the hierarchical order resulting from the clustering and the fragmentation stemming from the classification.