Gene ontology annotations per iteration on lung cancer data. The x-axis shows the iteration number, each of which identifies a subset of approximately 30 genes. The y-axis is a set of labels from the GATHER interface to the Gene Ontology, selecting labels at depth 5 in the ontology structure. The intensity of the color at an (x,y) location indicates the number of genes in the subset associated with that label. By comparing one column with another, the results suggest that different iterations contain genes associated with different biological processes. By comparing one row to another, one can see the distribution of genes over iterations relating to a specific process.