This track shows expression data from the GNF Gene Expression Atlas 2. This contains two replicates each of 61 mouse tissues and 79 human tissues run over Affymetrix microarrays. By default, averages of related tissues are shown. Display all tissues by selecting "All Arrays" from the "Combine arrays" menu on the track settings page. As is standard with microarray data red indicates overexpression in the tissue, and green indicates underexpression. You may want to view gene expression with the Gene Sorter as well as the Genome Browser.