Heat map. A heat map demonstrating the relative level of differentially expressed genes between the time points 1 h and 3 h. The color of each gene relates to its M-value (log2 ratio of (gene expression of TNFα treated cells/gene expression of control cells)). A positive M-value corresponds to a higher expression in the TNFα treated cells. Gene symbols  are used for gene identification. The three columns represent the three cell lines used in the study. (A) Heat map for the GO-term GO:0046330 (positive regulation of JNK cascade). (B) Heat map for the GO-term GO:0043123 (positive regulation of I-kappaB kinase/NF-kappaB cascade).