This column displays selected data from the Mouse GNF Expression Atlas on the Affymetrix Mouse U74A chip. The data shows the ratio of expression of each gene in selected tissues to the expression of the gene overall.
By default, a gene that is more highly expressed in a tissue is colored red, and a less expressed gene is shown in green. This coloring is standard, but is the opposite of what a naive user might expect: in this case, red means go, and green means stop! Black means a gene is neither over nor under expressed in the tissue. Uncolored boxes (white on most browsers) represent missing data.
Color-blind users can switch the coloring from red/green to blue/green via the configure button.
For detailed information about these experiments, see Su et al., "Large-scale analysis of the human and mouse transcriptomes", PNAS 99(7):4465-70.