Unsupervised hierarchical clustering of expression profiles of 10 groups of 53 fibrous tumors. Unsupervised hierarchical clustering of 53 tumors (columns) using 961 genes (rows). Within the heatmap, red represents higher expression, black represents mean expression, green represents lower expression, and gray represents normalized expressional level zero. Note: In several instance tumors of the same diagnosis appear adjacent to each other in the figure. It should be noted that the arms of the dendrogram can rotate freely and that it is the length of the dendrogram arms that determines the similarity between cases.