Heatmap showing genes with elevated expression in normal mesangial cells. Expression patterns of 172 genes with up-regulation in mesangial cells are compared across multiple renal compartments, including cap mesenchyme, renal vesicle, total renal cortex, podocytes, endothelial cells and renal capsule. Red indicates high, yellow represents intermediate and blue indicates low gene expression level. Most of the 172 genes are not uniquely expressed in mesangial cells, but do show significantly elevated mesangial expression. For an image that can be zoomed to visualize gene names see Additional file 2: Figure S1.