Analyzing combinatorial features, step 1: intra-cluster enrichment analysis. For cluster S2, the first column of the heatmap displays the top enriched GO terms associated to its target mRNAs, with the GO terms biological products (BP) in the upper panel, cellular components (CC) in the middle panel, and molecular functions (MF) in the lower panel. The remaining columns show the enrichment analysis performed on the lists of mRNAs interacting with each individual member of cluster S2. Cells are colored according to the enrichment P values, with significant enrichments displayed in shades of blue. The top rows of each panel list the semantic similarity values between enriched terms associated to the cluster and those associated to the single trans-factors.