Clustering and annotation of differentially expressed genes. (a) The clustering of genes up-regulated in prostate metastases. The clustering is based on the similarity of the concept profiles of the genes. (b) A fragment of the annotation for cluster A. The annotation view displays for a cluster a group cohesion score with a p-value, and a list of concepts with their percentage contribution to the score. In addition, the weights of the concepts in the concept profiles are shown.