This track shows selected data from the GNF Expression Atlas ratio of expression of a gene in selected tissues to expression of the gene overall. By default if a gene is more highly expressed in a tissue it will be colored red, and if it is less expressed in the tissue it will be green. This coloring is standard, but the opposite of what a naive user might think. In this case red means go, and green means stop! Color blind users can switch from red/green to blue/green coloring in the configuration page.