Clustering of genetic and environmental factors together, based on similarity of profiles of diseases for which they are etiological. Only the top 427 etiological factors based on counts of articles are shown arbitrarily, for visibility. Arrows indicate the position of genes across this clustering, showing that genes do not all cluster together. Numbers and letters on the left indicate regions magnified for subsequent figures. Please see the journal's website or our website http://etiome.stanford.edu for a PDF version of this figure that can be magnified.