Heatmap representing the expression of genes with significantly different expression in MALT lymphoma compared with all the other lymphomas or normal tissues. The 4 genes overexpressed exclusively in MALT lymphoma are highlighted. The scaling of the heatmap is similar to Figure 1. The gene expression profiling datasets for normal lung and plasma cells and lymphoid neoplasms other than MALT lymphoma were obtained from previously published, publicly available sources as described in “Other gene expression datasets.”