Venn diagram illustrating the number of genes reliably detected. The "Absolute call" parameter obtained using the Affymetrix® Microarray suite 5.0 software was used to determine whether or not a gene was expressed. Values indicate the number of genes identified in a minimum of one benign adult somatic tissue (top), one cancer (bottom), and pooled testes (right). Overlapping areas indicate common genes present in more than one category. The area highlighted in white depicts genes with a characteristic GCA tissue distribution.