On-node data mapping. Averages of mapped samples for different data types of the TCGA glioblastoma dataset overlaid as color codes on nodes of the KEGG glioma pathway. Bars at the bottom of the nodes encode the variance across the mapped samples. (a) mRNA data, using a blue-white-red color map where blue corresponds to under-, white to regular, and red corresponds to overexpression. (b) Copy number data, also on a blue-white-red color map, where blue corresponds to deletions, white to a regular copy number, and red to increased copies of the gene.