Hierarchical clustering of differentially expressed genes identifies gene clusters with biological associations. Gene-expression patterns are shown in rows; tissue profiles in columns. Degree of color saturation reflects the magnitude of the expression ratio. Note that for optimal clustering, the expression data for each individual dye-swap experiment was used (see key for directionality of expression via color pairs). The black bar at the right side of the main array indicates the immunity cluster, the blue bar the lipogenesis cluster, and purple bars the cell-cycle/growth-inhibitor genes.