Hierarchic clustering based on the set of mRNA differentially expressed in DLBCL with 9p21 deletion. The relative levels of gene expression of each probe set are depicted according to the color scale shown at the bottom of the heatmap. Each row represents a separate Affymetrix probeset on the microarray, and each column represents a separate lymphoma sample. Green boxes at the top of the columns indicate samples with CDKN2A deletions; yellow boxes, samples without CDKN2A deletions. HUGO genes symbols are listed in the right column.