Heat map of differential methylation in the discovery dataset.

<p>Heat map based on a set of 1864 CpG sites that significantly segregated GBM and control brain tissues into six methylation classes in the discovery dataset. Methylation class numbers are marked inside the annotation bar. The heat map columns represented CpG probes, and the rows are tumor and control brain samples. In the color scale, relative hypermethlyation is denoted by a shift towards the red color, and relative hypomethylation towards blue. Neutral methylation is gray.