Figure 1
From: Developmental biologists cast a net over sequenced genomes
A 'topomap' of Caenorhabditis elegans gene expression. The co-regulation of genes is plotted in three dimensions; the z axis represents gene density and the position in the x-y plane is a relative measure of gene relatedness based on the microarray expression data. Selected classes of gene are enriched in specific 'mountains'. Image courtesy of Stuart Kim.