Heatmap representing genes with spiked expression in MALT lymphoma. The color scale for gene expression is set to highlight cases with high expression of these genes. Genes that are expressed less than 4-fold higher than median are indicated in green, those that are expressed between 4- to 10-fold higher than median are indicated in black, whereas those that are expressed at greater than 10-fold higher than median are in red. The legend for the color bars indicating different pathologic features is presented in the figure.